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CN111108634A - Electrode for electricity storage device and electricity storage device - Google Patents

Electrode for electricity storage device and electricity storage device Download PDF

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Publication number
CN111108634A
CN111108634A CN201880060740.0A CN201880060740A CN111108634A CN 111108634 A CN111108634 A CN 111108634A CN 201880060740 A CN201880060740 A CN 201880060740A CN 111108634 A CN111108634 A CN 111108634A
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CN
China
Prior art keywords
electrode
storage device
electric storage
collector plate
bent portion
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Granted
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CN201880060740.0A
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Chinese (zh)
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CN111108634B (en
Inventor
井户贵彦
守屋茂树
前田伸也
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Ibiden Co Ltd
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Ibiden Co Ltd
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Publication of CN111108634A publication Critical patent/CN111108634A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H01G11/30—Electrodes characterised by their material
    • H01G11/50—Electrodes characterised by their material specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/66—Current collectors
    • H01G11/68—Current collectors characterised by their material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

The invention provides an electrode for an electric storage device and an electric storage device using the same, wherein the electrode has a structure which is not easy to warp or wrinkle even if a large amount of metal ions are occluded and released. An electrode for an electric storage device according to the present invention is an electrode for an electric storage device including a collector plate having an electrode portion disposition region and an electrode portion non-disposition region, and an electrode portion disposed in the electrode portion disposition region, wherein the collector plate is formed of stainless steel containing an austenite structure including a martensite structure; the electrode portion includes silicon as an active material; the current collector plate includes a bent portion in the electrode portion non-arrangement region.

Description

Electrode for electricity storage device and electricity storage device
Technical Field
The present invention relates to an electrode for an electricity storage device and an electricity storage device.
Background
An electric storage device using a metal having a high tendency to be converted into lithium plasma is used in many fields because it can store a large amount of energy.
As a method for manufacturing such an electric storage device, patent document 1 discloses a method for manufacturing an electric storage device including: the method for producing a lithium secondary battery includes a positive electrode formed on a positive electrode current collector having through-holes, the positive electrode including a carbonaceous material having a layered structure into which anions can be inserted and extracted as a positive electrode active material, a negative electrode formed on a negative electrode current collector having through-holes, the negative electrode including a carbonaceous material having a layered structure into which lithium ions can be inserted and extracted as a negative electrode active material, and a nonaqueous electrolyte containing a lithium salt, and is characterized by including the steps of: a step of manufacturing a battery cell for an electric storage device, in which a laminate obtained by laminating the positive electrode and the negative electrode with a separator interposed therebetween and a lithium ion supply source are arranged, and the nonaqueous electrolytic solution is injected; a charge/discharge step of performing charge/discharge between the positive electrode and the lithium ion supply source; and a storage step of allowing electrochemical contact between the negative electrode and the lithium ion source to store lithium ions in the negative electrode.
In the method for manufacturing an electric storage device described in patent document 1, metallic lithium is used as a lithium ion supply source. The lithium ion supply source is used to charge and discharge between the positive electrode and the lithium ion supply source, and further, the negative electrode and the lithium ion supply source are brought into electrochemical contact with each other to store lithium ions in the negative electrode.
When an electric storage device is manufactured by the method described in patent document 1, metallic lithium as a lithium ion supply source remains in the electric storage device.
The metallic lithium contained in the lithium ion supply source is a flammable hazardous material. Therefore, it is preferable that the metallic lithium does not remain in the electricity storage device.
Patent document 2 describes the use of a carbonaceous material pre-doped with lithium ions as such a lithium ion supply source.
That is, it is described that a carbonaceous material is fixed to a current collector, and lithium ions are included between layers of the carbonaceous material by intercalation, and this is used as a lithium-containing electrode.
By using such a lithium ion-containing electrode, it is possible to charge and discharge between the positive electrode and the lithium ion supply source without using lithium metal, and further, it is possible to cause electrochemical contact between the negative electrode and the lithium ion supply source, thereby trapping lithium ions in the negative electrode.
In the case where lithium ions are encapsulated in a carbonaceous material by intercalation, the occlusion amount of lithium ions has a theoretical upper limit of 372mAh/g, which cannot be exceeded. Therefore, research into materials capable of occluding more lithium ions than carbonaceous materials has been conducted.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2014-211950
Patent document 2: japanese patent laid-open publication No. 2016-103609
Disclosure of Invention
Problems to be solved by the invention
Silicon is known as a substance that can be alloyed by being chemically bonded to lithium ions and can occlude lithium ions. In the case of using silicon to store lithium ions, it is theoretically considered that lithium ions of 4000mAh/g or more can be stored.
That is, when lithium ions are occluded by silicon, the occlusion amount of lithium ions per unit volume is large, and the electric storage device can have a high capacity.
However, there is a problem that expansion and contraction of the active material itself increase when lithium ions are occluded and released.
Therefore, when silicon is fixed to a current collector, a lithium-containing electrode is formed by wrapping lithium ions in silicon, and the lithium-containing electrode is used as a lithium ion supply source in the production of an electric storage device, there is a problem that the current collector is largely deformed, and the current collector is warped or wrinkled.
The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrode for an electric storage device having a structure in which warping or wrinkling is not likely to occur even if a large amount of metal ions are occluded and released, and an electric storage device using the same.
Means for solving the problems
(1) An electrode for an electric storage device of the present invention is an electrode for an electric storage device comprising a collector plate having an electrode portion disposition region and an electrode portion non-disposition region, and an electrode portion disposed in the electrode portion disposition region,
the current collector plate is made of stainless steel containing an austenite structure including a martensite structure,
the electrode portion includes silicon as an active material,
the current collector plate includes a bent portion in the electrode portion non-arrangement region.
In the electrode for an electric storage device according to the present invention, the current collecting plate is formed of stainless steel containing an austenite structure including a martensite structure.
The hardness of the martensite structure is high. Therefore, when the current collector plate is formed of stainless steel containing an austenite structure including a martensite structure, the current collector plate can be made hard and high in strength. Therefore, warpage or wrinkles are easily prevented from occurring in the collector plate.
Therefore, even when the volume of the active material changes due to the metal ions being occluded in the active material of the electrode portion or due to the metal ions being released from the active material occluded in the electrode portion, the current collector plate is easily prevented from warping or wrinkling.
In the electrode for an electric storage device according to the present invention, the current collecting plate includes a bent portion in the electrode portion non-arrangement region.
When the bent portion is provided, a reinforcing effect occurs, and the collector plate is less likely to warp.
The electrode for an electric storage device of the present invention is preferably in the following embodiment.
(2) In the electrode for an electric storage device according to the present invention, it is preferable that the martensite structure is dispersed in island form in the austenite structure in a cross section of the current collecting plate except for the bent portion, the cross section being cut in a thickness direction.
In addition, the martensite structure is dispersed in the austenite structure in island shapes, which can be said that the content (mass) of the austenite structure is larger than the content (mass) of the martensite structure.
Since the current collector plate is chemically stable in austenite, the current collector plate having such a structure is less likely to be corroded or dissolved.
(3) In the electrode for an electric storage device according to the present invention, it is preferable that the electrode portion disposition region has 2 or more, and the bent portion is located between the adjacent electrode portion disposition regions.
When the bent portion is provided between the adjacent electrode portion disposition regions, the current collecting plate can be effectively bent, and the electrode for the power storage device can be miniaturized.
(4) In the electrode for an electric storage device according to the present invention, the bent portion is preferably formed of stainless steel containing only an austenite structure.
The hardness of the martensite structure is high. Therefore, when the bent portion has a martensite structure, the current collecting plate is bent not only at the bent portion but also in the electrode arrangement region, and the electrode is easily peeled off.
On the other hand, the toughness of the austenitic structure is sufficiently high. Therefore, when the bent portion is formed of stainless steel containing only austenite, the current collecting plate is not easily broken.
(5) In the electrode for an electric storage device according to the present invention, it is preferable that the bent portion is formed with a notch.
When the bent portion is cut, the collector plate is easily bent. Therefore, when the collector plate is bent, stress is not easily applied to the electrode portion arrangement region of the collector plate.
Therefore, the electrode portion can be prevented from being separated from the current collecting plate.
(6) In the electrode for an electric storage device according to the present invention, it is preferable that the bent portion is formed with a through hole.
When the bent portion is perforated, the current collecting plate is easily bent. Therefore, when the collector plate is bent, stress is not easily applied to the electrode portion arrangement region of the collector plate.
Therefore, the electrode portion can be prevented from being separated from the current collecting plate.
(7) In the electrode for an electric storage device according to the present invention, the bent portion preferably has a cut-out portion.
When the bent portion has a cut-out portion, the collector plate is easily bent. Therefore, when the collector plate is bent, stress is not easily applied to the electrode portion arrangement region of the collector plate.
Therefore, the electrode portion can be prevented from being separated from the current collecting plate.
(8) In the electrode for an electricity storage device of the present invention, the active material preferably contains only silicon.
Silicon can occlude metal ions by chemically bonding with the metal ions.
Therefore, a larger amount of metal ions can be occluded as compared with a substance in which metal ions are occluded by intercalation, such as carbon. In particular, in the case of lithium ions, the lithium ion can be occluded at 4000mAh/g or more.
Therefore, the capacitance can be sufficiently increased.
When a large amount of metal ions are occluded in silicon or released from silicon in this manner, the volume of silicon as an active material changes significantly. When the volume of silicon changes in this manner, the collector plate is likely to be wrinkled or warped.
However, in the electrode for an electric storage device according to the present invention, the current collecting plate is formed of stainless steel containing an austenite structure including a martensite structure. Therefore, even when the volume of silicon changes, the collector plate is less likely to warp or wrinkle.
(9) The electric storage device of the present invention is characterized by comprising the electrode for an electric storage device of the present invention.
Therefore, in the electric storage device of the present invention, the current collecting plate of the electrode for an electric storage device is less likely to be wrinkled or warped.
ADVANTAGEOUS EFFECTS OF INVENTION
In the electrode for an electric storage device according to the present invention, the current collecting plate is formed of stainless steel containing an austenite structure including a martensite structure.
The hardness of the martensite structure is high. Therefore, when the current collector plate is formed of stainless steel containing an austenite structure including a martensite structure, the current collector plate can be made hard and high in strength. Therefore, the collector plate is easily prevented from warping or wrinkling.
Drawings
Fig. 1 (a) is a plan view schematically showing an example of an electrode for an electric storage device according to the present invention, and fig. 1 (b) is a cross-sectional view taken along line a-a of fig. 1 (a).
Fig. 2 is a cross-sectional view schematically showing an example of a cross section of the current collecting plate in the electrode for an electric storage device according to the present invention, the cross section being cut in the thickness direction.
Fig. 3 (a) to (c) are perspective views schematically showing an example of a bent portion of the current collecting plate in the electrode for an electric storage device according to the present invention.
Fig. 4 (a) is a plan view schematically showing an example of an electrode for an electric storage device according to the present invention. Fig. 4 (B) is a sectional view taken along line B-B of fig. 4 (a).
Fig. 5 is a perspective view schematically showing an example of a state in which the electrode for an electric storage device shown in fig. 4 is bent.
Fig. 6 (a) to (d) are schematic diagrams schematically showing an example of a manner of housing the positive electrode, the negative electrode, and the separator in the electric storage device of the present invention.
Fig. 7 is a cross-sectional view schematically showing an example of the power storage device of the present invention.
Detailed Description
The electrode for an electric storage device of the present invention will be described below with reference to the drawings, but the electrode for an electric storage device of the present invention is not limited to the following description.
Fig. 1 (a) is a plan view schematically showing an example of an electrode for an electric storage device according to the present invention, and fig. 1 (b) is a cross-sectional view taken along line a-a of fig. 1 (a).
As shown in fig. 1 (a), the electrode 10 for an electric storage device includes a rectangular current collector plate 20 and a substantially square electrode portion 30, the current collector plate 20 has an electrode portion arrangement region 21 and an electrode portion non-arrangement region 22, and the electrode portion 30 is arranged in the electrode portion arrangement region 21.
The electrode portion disposition region 21 is located at the center of the current collector plate 20, and the electrode portion non-disposition region 22 is located around the electrode portion disposition region.
In addition, the current collector plate 20 has 2 bent portions (a bent portion 25a and a bent portion 25b) formed in the electrode portion non-arrangement region 22 with the electrode portion arrangement region 21 interposed therebetween.
As shown in fig. 1 (b), the current collecting plate 20 is formed in a concave shape by a bent portion 25a and a bent portion 25 b.
The current collector plate 20 is made of stainless steel containing an austenite structure including a martensite structure.
The electrode portion 30 contains silicon as an active material.
In the electrode 10 for an electric storage device, the current collecting plate 20 is formed of stainless steel containing an austenite structure including a martensite structure.
The hardness of the martensite structure is high. Therefore, when the current collector plate 20 is formed of stainless steel containing an austenite structure including a martensite structure, the current collector plate 20 can be made hard and have high strength. Therefore, the occurrence of warping or wrinkling in the current collector plate 20 is easily prevented.
Therefore, even when the volume of the active material changes due to the metal ions being occluded in the active material of the electrode portion 30 or due to the metal ions being released from the active material occluded in the electrode portion, the current collector plate 20 is easily prevented from warping or wrinkling.
In the electrode 10 for an electric storage device, it is preferable that the martensite structure is dispersed in island form in the austenite structure in a cross section obtained by cutting the current collecting plate 20 except for the bent portion 25a and the bent portion 25b in the thickness direction.
The following describes a state in which the martensite structure is dispersed in the austenite structure in island form, with reference to the drawings.
Fig. 2 is a cross-sectional view schematically showing an example of a cross section of the current collecting plate in the electrode for an electric storage device according to the present invention, the cross section being cut in the thickness direction.
In fig. 2, reference numeral 26 denotes a martensite structure, and reference numeral 27 denotes an austenite structure.
As shown in fig. 2, the phrase "the martensite structure is dispersed in the austenite structure in the form of islands" in the present specification means that the martensite structure 26 is present in the austenite structure in the form of patches without being localized.
The martensite structure is dispersed in the austenite structure in the shape of islands, and it can be said that the content (mass) of the austenite structure is larger than that of the martensite structure.
Since the austenite structure is chemically stable, the collector plate thus configured is less likely to be corroded or eluted.
The existence of the martensite structure and the austenite structure can be analyzed by an electron back scattering diffraction pattern measurement method (EBSD method) under the following conditions.
(conditions of EBSD method)
< analyzing apparatus >
EF-SEM: JSM-7000F/EBSDD, manufactured by Japan electronic Co., Ltd: TSL Solution
< analysis conditions >
The range is as follows: 14X 36 μm
Step length: 0.05 μm/step
Measurement points: 233376
Multiplying power: 5000 times of
Phase of gamma-iron, α -iron
In the electrode 10 for an electricity storage device, the thickness of the current collecting plate 20 is preferably 5 to 50 μm.
When the thickness of the collector plate is less than 5 μm, the collector plate is too thin, and thus the collector plate is easily broken.
When the thickness of the current collecting plate is larger than 50 μm, the thickness is too large, and therefore the size of the electric storage device using the electrode for an electric storage device including the current collecting plate having such a thickness is likely to increase.
The tensile strength of the current collector plate 20 is not particularly limited, but is preferably 300 to 1500 MPa.
In the electrode 10 for an electric storage device, in a cross section of the current collecting plate 20 other than the bent portion 25a and the bent portion 25b cut in the thickness direction, the area of the martensite structure is preferably 5 to 20% of the entire cross section.
When the area occupied by the martensite structure is within the above range, the current collector plate 20 is not easily corroded, and has high strength.
When the area occupied by the martensite structure is less than 5%, the strength improvement effect of the current collector plate due to the inclusion of the martensite structure is not easily obtained.
When the area occupied by the martensite structure is more than 20%, the martensite structure is easily exposed on the surface, and the martensite structure continuously exists in the current collector plate, so that the entire current collector plate is easily corroded. Further, since the ratio of the martensite structure is increased, the toughness of the current collecting plate is easily lowered, and as a result, the current collecting plate is easily broken.
In the electrode 10 for an electric storage device, the current collector plate 20 includes a bent portion 25a and a bent portion 25b in the electrode portion non-arrangement region 22.
When such a bent portion is provided, a reinforcing effect is produced, and the current collecting plate 20 is less likely to warp.
In the electrode 10 for an electric storage device, the bent portion 25a and the bent portion 25b are preferably formed of stainless steel containing only an austenite structure.
The hardness of the martensite structure is high. Therefore, when the bent portion has a martensite structure, the current collector plate is bent at the bent portion and continues to be bent to the electrode portion arrangement region, and the electrode portion is easily peeled off.
On the other hand, the toughness of the austenitic structure is sufficiently high. Therefore, when the bent portion is formed of stainless steel containing only austenite, the current collector plate 20 is not easily broken.
Examples of a method for forming the bent portions 25a and 25b from stainless steel containing only an austenite structure include the following methods.
First, a current collecting plate made of stainless steel containing an austenite structure including a martensite structure is prepared.
Next, the current collecting plate that becomes the bent portion is heated. The martensite structure is denatured into the austenite structure by being heated. The heating conditions are preferably 1000 to 1200 ℃ for 0.1 to 10 minutes.
Examples of the heating method include a method of contacting a heated heat source and a method of performing high-frequency induction heating.
In this way, the bent portions 25a and 25b can be formed of stainless steel containing only an austenite structure.
The electrode 10 for an electric storage device may have a cut, a perforation, or a cut-out portion in the bent portion 25a and the bent portion 25 b.
Such a bending portion will be described below with reference to the drawings.
Fig. 3 (a) to (c) are perspective views schematically showing an example of a bent portion of the current collecting plate in the electrode for an electric storage device according to the present invention.
Fig. 3 (a) to (c) show the state of the bent portion before bending the current collecting plate.
As shown in fig. 3 (a), in the electrode 10 for an electric storage device, a notch 28a may be formed in the bent portion 25a and the bent portion 25b of the current collecting plate 20.
As shown in fig. 3 (b), in the electrode 10 for an electric storage device, a through hole 28b may be formed in the bent portion 25a and the bent portion 25b of the current collecting plate 20.
As shown in fig. 3 (c), the power storage device electrode 10 may have a cut-out portion 28c at the bent portion 25a and the bent portion 25b of the current collector plate 20.
When the bent portions 25a and 25b have the cutouts 28a, the perforations 28b, and the cut-outs 28c, the current collector plate 20 is easily bent. Therefore, stress is not easily applied to the electrode portion disposition region of the collector plate 20 when the collector plate 20 is bent. When the electrode portion disposition region is curved, the electrode portion disposed in the electrode portion disposition region is likely to be peeled off.
However, when the bent portions 25a and 25b have notches, such stress is not easily applied.
Therefore, the electrode portion can be prevented from being separated from the current collecting plate.
The cuts, perforations, and cut-outs may be formed in only 1 row, or may be formed in two or more rows.
The cuts, perforations, cut-away portions may be formed on the collector plate by using a cutter, punch, or the like.
In the electrode 10 for an electricity storage device, the electrode portion 30 preferably contains an active material and a binder.
The active material may contain carbon or the like in addition to silicon.
The average particle size of the active material is not particularly limited, but is preferably 1 to 10 μm.
When the average particle size of the active material is 1 μm or more, the average particle size of the active material can be easily adjusted.
When the average particle diameter of the active material is 10 μm or less, the specific surface area can be sufficiently increased, and therefore, the time required for charge and discharge or doping can be shortened.
In the electrode 10 for an electricity storage device, the active material in the electrode portion 30 preferably contains only silicon.
Silicon can occlude metal ions by chemically bonding with the metal ions.
Therefore, a larger amount of metal ions can be occluded as compared with a substance in which metal ions are occluded by intercalation, such as carbon. In particular, lithium ions can be occluded at 4000mAh/g or more.
Therefore, when the active material contains only silicon, the capacitance can be sufficiently increased.
When a large amount of metal ions are occluded in silicon or released from silicon, the volume of silicon as an active material changes significantly. When the volume of silicon changes in this manner, the collector plate is likely to be wrinkled or warped.
However, in the electrode for an electric storage device according to the present invention, the current collecting plate is formed of stainless steel containing an austenite structure including a martensite structure. Therefore, even when the volume of silicon changes, the collector plate is less likely to warp or wrinkle.
The material of the binder of the electrode portion 30 is not particularly limited, and polyimide resin, polyamideimide resin, and the like can be given. Among these, polyimide resins are preferred.
Polyimide resins are compounds having heat resistance and strength. Therefore, when the active material is bonded with the binder made of polyimide resin, even if the volume of the active material changes due to occlusion and release of metal ions, the electrode portion 30 can be made less likely to be peeled off from the current collector plate 20.
The weight ratio of the active material to the binder in the electrode portion 30 is preferably active material: binder 70: 30-90: 10.
in addition, a conductive auxiliary agent may be contained in the binder of the electrode portion 30.
The material of the conductive assistant is not particularly limited, and examples thereof include carbon black, carbon fiber, and carbon nanotube. Among these, carbon black is preferably contained.
When the binder contains a conductive assistant, the conductivity of the electrode 10 for an electricity storage device can be improved. Therefore, current can be efficiently collected.
In particular, when the amount of carbon black is small, the conductivity can be secured. Therefore, when carbon black is used as the conductive aid, the electrical conductivity of the electrode 10 for an electrical storage device can be further improved.
When the conductive additive contains carbon black, the average particle diameter is preferably 3 to 500 nm.
In the electrode portion 30, the weight ratio of the conductive auxiliary agent in the binder is preferably 20 to 50%.
In the electrode 10 for an electricity storage device, the thickness of the electrode portion 30 is not particularly limited, but is preferably 5 to 50 μm.
When the thickness of the electrode portion is less than 5 μm, the amount of the active material is reduced as compared with the current collector plate, and thus the capacitance is easily reduced.
When the thickness of the electrode portion is more than 50 μm, the size of the electric storage device manufactured using the electrode for an electric storage device increases. Further, the distance of movement of the metal ions in the electrode portion becomes long, and it takes time to charge and discharge.
The area density of the electrode portion 30 on one surface is not particularly limited, but is preferably 0.1 to 10mg/cm2。
Next, another embodiment of the electrode for an electric storage device of the present invention will be described.
Fig. 4 (a) is a plan view schematically showing an example of an electrode for an electric storage device according to the present invention. Fig. 4 (B) is a sectional view taken along line B-B of fig. 4 (a).
Fig. 4 (a) and (b) show the state of the electric storage device before being bent.
Fig. 5 is a perspective view schematically showing an example of a state in which the electrode for an electric storage device shown in fig. 4 is bent.
As shown in fig. 4, the electrode 110 for an electric storage device includes: a collector plate 120 having 2 or more electrode portion disposition regions 121 and electrode portion non-disposition regions 122, and 2 or more electrode portions 130 disposed in the electrode portion disposition regions 121.
The electrode portion 130 is disposed on both surfaces of the collector plate 120.
The bent portion 125 is located between the electrode portion disposition regions 121 adjacent to each other.
As shown in fig. 5, the electrode 110 for an electric storage device is used after being bent.
When the bent portion 125 is provided between the adjacent electrode portion arrangement regions 121, the current collector plate 120 can be bent tightly, and the electrode for the power storage device can be downsized.
The material, shape, and the like of the current collector plate 120 of the electrode 110 for an electric storage device are the same as those of the current collector plate 20 of the electrode 10 for an electric storage device.
The preferred material, shape, and the like of the bent portion 125 in the electrode 110 for an electric storage device are the same as those of the bent portion 25a and the bent portion 25b of the electrode 10 for an electric storage device.
The electrode portion 130 of the electrode 110 for an electric storage device is preferably made of the same material, shape, and the like as those of the electrode portion 30 of the electrode 10 for an electric storage device.
The electrode for an electric storage device of the present invention is used as a positive electrode or a negative electrode of an electric storage device or a metal ion supply electrode for doping metal ions.
Next, a method for manufacturing an electrode for an electric storage device according to the present invention will be described.
(1) Process for producing collector plate
First, a metal plate made of stainless steel containing an austenite structure is prepared.
Next, the collector plate is produced by performing extension processing on the metal plate. By this drawing process, a part of the austenite structure is transformed into a martensite structure.
In this way, a current collecting plate made of stainless steel containing an austenite structure including a martensite structure can be manufactured.
(2) Step of determining position of bending part
Then, an electrode portion arrangement region and an electrode portion non-arrangement region of the collector plate are determined.
Then, the position to be the bent portion is determined in the electrode portion non-arrangement region of the collector plate.
In this case, the electrode non-arrangement region of the collector plate may be processed so that the bent portion is made of stainless steel containing only austenite, and a notch, a perforation, a notch, or the like may be formed at the bent portion.
The machining method may be, for example, heat treatment, machining, laser machining, or the like.
The position to be the bent portion is preferably determined arbitrarily according to the application of the electrode for an electric storage device to be manufactured.
(3) Process for producing active material slurry
Silicon and a binder are mixed to prepare an active material slurry.
The weight ratio of the active material to the binder is not particularly limited, and is preferably as follows: binder 70: 30-90: 10.
The binder is not particularly limited, and examples thereof include a polyimide resin precursor, a polyamideimide resin precursor, and the like. Among these, polyimide resin precursors are preferable.
The viscosity of the active material slurry is preferably 1 to 10 pas from the viewpoint of coatability. The viscosity of the slurry was measured at 1 to 10rpm using a B-type viscometer.
The viscosity of the active material slurry can be adjusted by adjusting the ratio of the active material to the binder. The viscosity may be adjusted by a thickener or the like as necessary.
(4) Coating process of active material slurry
The active material slurry is applied to the electrode portion disposition region of the collector plate.
The amount of the active material slurry to be applied is not particularly limited, but is preferably 0.1 to 10mg/cm after heating and drying2。
(5) Pressing process
Next, the collector plate coated with the active material slurry is subjected to press working.
The pressure for the press working is not particularly limited, and is sufficient as long as the active material can be pressed flat.
(6) Heating step
Next, the collector plate coated with the active material slurry is heated to cure the binder included in the active material slurry.
The heating conditions are preferably determined according to the type of the binder used.
When the binder contains a polyimide resin precursor, the heating temperature is preferably 250 to 350 ℃. The atmosphere during heating is preferably an inert atmosphere such as a nitrogen atmosphere.
(7) Bend forming step
Next, the current collecting plate is bent into a predetermined shape to form a bent portion.
This step may be performed immediately after the step (2) of determining the position of the bent portion, or may be performed when the electric storage device is manufactured using the electrode for an electric storage device.
Through such a process, the electrode for an electric storage device of the present invention having the collector plate deformed into a desired shape can be manufactured.
Next, an electric storage device using the electrode for an electric storage device of the present invention will be described.
An electric storage device using the electrode for an electric storage device of the present invention is also the electric storage device of the present invention.
The power storage device of the invention is composed of
A positive electrode,
A negative electrode,
A separator for separating the positive electrode and the negative electrode,
An electricity storage case housing the positive electrode, the negative electrode, and the separator, and
an electrolyte enclosed in the power storage case,
the positive electrode or the negative electrode may be the electrode for an electric storage device of the present invention.
In the above-described electric storage device of the present invention, the negative electrode is preferably an electrode for an electric storage device of the present invention.
The following describes an electric storage device of the present invention in which the negative electrode is an electrode for an electric storage device of the present invention.
In the electrode for an electric storage device according to the present invention, the positive electrode is preferably composed of a positive electrode current collector plate and a positive electrode active material provided in the positive electrode current collector plate.
The positive electrode current collector plate is not particularly limited, and preferably contains aluminum, nickel, copper, silver, and alloys thereof.
The positive electrode active material is not particularly limited, and examples thereof include: LiMnO2、LixMn2O4(0<x<2)、Li2MnO3、LixMn1.5Ni0.5O4(0<x<2) Lithium manganate having a layered structure or lithium manganate having a spinel structure; LiCoO2、LiNiO2Or those obtained by replacing a part of these transition metals with another metal; LiNi1/3Co1/3Mn1/3O2Lithium transition metal oxides having not more than half of the specific transition metals; in these lithium transition metal oxides, Li is in excess of the stoichiometric compositionThe resulting material; LiFePO4And the like having an olivine structure; and so on.
In addition, a material obtained by partially substituting these metal oxides with aluminum, iron, phosphorus, titanium, silicon, lead, tin, indium, bismuth, silver, barium, calcium, mercury, palladium, platinum, tellurium, zirconium, zinc, lanthanum, or the like can be used. Particularly preferred is LiαNiβCoγAlδO2(1 ≦ α ≦ 2, β + γ + δ ≦ 1, β ≧ 0.7, γ ≦ 0.2) or LiαNiβCoγMnδO2(1≦α≦1.2、β+γ+δ＝1、β≧0.6、γ≦0.2)。
The positive electrode active material may be used alone or in combination of 2 or more.
In the above-described electricity storage device of the present invention, the separator is not particularly limited, and a porous film such as polypropylene or polyethylene, or a nonwoven fabric may be used. Further, as the separator, a member obtained by laminating these may be used. In addition, polyimide, polyamide imide, polyvinylidene fluoride (PVDF), Polytetrafluoroethylene (PTFE), cellulose, and glass fiber, which have high heat resistance, can be used. In addition, a fabric separator in which these fibers are bundled into a thread and woven may also be used.
In the above-described electricity storage device of the present invention, the electrolytic solution is not particularly limited, and a solution obtained by dissolving a metal salt as an electrolyte in a solvent may be used.
Examples of the solvent include cyclic carbonates such as Propylene Carbonate (PC), Ethylene Carbonate (EC), Butylene Carbonate (BC), and Vinylene Carbonate (VC), chain carbonates such as dimethyl carbonate (DMC), diethyl carbonate (DEC), methylethyl carbonate (EMC), and dipropyl carbonate (DPC), aliphatic carboxylic acid esters such as methyl formate, methyl acetate, and ethyl propionate, γ -lactones such as γ -butyrolactone, chain ethers such as 1, 2-Diethoxyethane (DEE) and ethoxymethoxyethane (EME), cyclic ethers such as tetrahydrofuran and 2-methyltetrahydrofuran, dimethyl sulfoxide, 1, 3-dioxolane, formamide, acetamide, dimethylformamide, acetonitrile, propionitrile, nitromethane, ethyl monoglyme, phosphotriester, trimethoxymethane, and dioxolane derivatives, Aprotic organic solvents such as sulfolane, methylsulfolane, 1, 3-dimethyl-2-imidazolidinone, 3-methyl-2-oxazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, diethyl ether, 1, 3-propane sultone, anisole, N-methylpyrrolidone, and fluorinated carboxylic acid esters.
These organic solvents may be used alone or in combination of 2 or more.
The metal salt is not particularly limited, and a lithium salt, a sodium salt, a calcium salt, a magnesium salt, and the like can be used.
When a lithium salt is used as the metal salt, LiPF is an example of the lithium salt6、LiAsF6、LiAlCl4、LiClO4、LiBF4、LiSbF6、LiCF3SO3、LiC4F9CO3、LiC(CF3SO2)2、LiN(CF3SO2)2、LiN(C2F5SO2)2、LiB10Cl10Lower aliphatic carboxylic acid lithium, boron lithium chloride, lithium tetraphenyl borate, LiBr, LiI, LiSCN, LiCl, imide, etc.
These metal salts may be used singly or in combination of 2 or more.
The electrolyte concentration of the electrolyte solution is not particularly limited, but is preferably 0.5 to 1.5 mol/L.
When the electrolyte concentration is less than 0.5mol/L, it is difficult to obtain sufficient conductivity of the electrolyte.
When the electrolyte concentration is more than 1.5mol/L, the density and viscosity of the electrolyte solution tend to increase.
Next, the manner of housing the positive electrode, the negative electrode, and the separator will be described with reference to the drawings.
In the following description, the case where the negative electrode is the electrode for an electric storage device of the present invention will be described.
Fig. 6 (a) to (d) are schematic diagrams schematically showing an example of a manner of housing the positive electrode, the negative electrode, and the separator in the electric storage device of the present invention.
As shown in fig. 6 (a), in the electric storage device of the present invention, the positive electrode 150, the separator 160, and the electrode 110 for an electric storage device as a negative electrode are stacked in this order, and the resulting stacked body 170 is wound and stored in an electric storage case (not shown).
At this time, the bent portion of the electrode 110 for the electric storage device is positioned at the corner portion at the time of winding.
As shown in fig. 6 (b), in the electric storage device of the present invention, the positive electrode 150, the separator 160, and the electrode 110 for an electric storage device as a negative electrode are stacked in this order, and the resulting stacked body 171 may be folded in a zigzag manner (ninety-nine folds) and stored in an electric storage case (not shown).
At this time, the bent portion of the electrode 110 for the electric storage device is positioned at the bent portion when folded in a zigzag manner (ninety-nine folds).
As shown in fig. 6 c, the power storage device of the present invention may be configured such that the stacked body 171a is formed by rotating the direction of folding the positive electrode 150 in the stacked body 171 shown in fig. 6 b by 90 degrees, and the stacked body 171a is housed in a power storage case (not shown).
As shown in fig. 6 (d), in the electric storage device of the present invention, the direction of folding the electrode 110 for an electric storage device, which is the negative electrode, in the laminated body 171 shown in fig. 6 (b) is rotated by 90 degrees to form a laminated body 171b, and the laminated body 171b can be housed in an electric storage case (not shown).
Next, another embodiment of the power storage device of the present invention will be described.
The power storage device of the invention is composed of
A positive electrode,
A negative electrode,
A separator for separating the positive electrode and the negative electrode,
A metal ion-supplying electrode for doping the positive electrode and/or the negative electrode with metal ions,
An electricity storage case housing the positive electrode, the negative electrode, the separator, and the metal ion supply electrode, and
an electrolyte enclosed in the power storage case,
the positive electrode, the negative electrode, or the metal ion-supplying electrode may be the electrode for an electric storage device of the present invention described above.
The following description deals with a case where the electrode for an electric storage device of the present invention is used as a metal ion supply electrode.
When the electrode for an electric storage device of the present invention is used as a metal ion supply electrode, it is necessary to dope the electrode for an electric storage device of the present invention with metal ions.
First, a method for doping metal ions into the electrode for an electric storage device of the present invention will be described.
(1) Organic electrolyte coating step
First, an organic electrolytic solution is applied to an electrode portion of a current collecting plate in the electrode for an electric storage device of the present invention.
The organic electrolytic solution is not particularly limited, and a solution obtained by dissolving a metal salt as an electrolyte in an organic solvent can be used.
Examples of the organic solvent include cyclic carbonates such as Propylene Carbonate (PC), Ethylene Carbonate (EC), Butylene Carbonate (BC), and Vinylene Carbonate (VC), linear carbonates such as dimethyl carbonate (DMC), diethyl carbonate (DEC), methylethyl carbonate (EMC), and dipropyl carbonate (DPC), aliphatic carboxylic acid esters such as methyl formate, methyl acetate, and ethyl propionate, γ -lactones such as γ -butyrolactone, linear ethers such as 1, 2-Diethoxyethane (DEE) and ethoxymethoxyethane (EME), cyclic ethers such as tetrahydrofuran and 2-methyltetrahydrofuran, dimethyl sulfoxide, 1, 3-dioxolane, formamide, acetamide, dimethylformamide, acetonitrile, propionitrile, nitromethane, ethyl monoglyme, phosphotriester, trimethoxymethane, and dioxolane derivatives, Aprotic organic solvents such as sulfolane, methylsulfolane, 1, 3-dimethyl-2-imidazolidinone, 3-methyl-2-oxazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, diethyl ether, 1, 3-propane sultone, anisole, N-methylpyrrolidone, and fluorinated carboxylic acid esters.
These organic solvents may be used alone or in combination of 2 or more.
When lithium is used as the metal ion source, the organic electrolytic solution preferably has lithium ion conductivity.
(2) Heating step
Next, the electrode portion coated with the organic electrolytic solution is brought into contact with a metal ion source, and the metal ion is doped by heating.
The metal ion source is not particularly limited, and examples thereof include lithium, sodium, magnesium, and calcium. Among these, lithium is preferable.
The heating conditions are not particularly limited, and the heating is preferably carried out at 250 to 300 ℃ for 10 to 120 minutes.
(3) Drying step
The doped electrode for an electric storage device is cleaned with a solvent and then naturally dried, thereby completing doping. As the solvent, DMC (dimethyl carbonate) or the like can be suitably used.
The method of doping is not limited to such a method of contacting with a metal ion source, and other methods may be used. For example, the metal ion source and the electrode for the electric storage device may be connected to an external circuit to perform electric doping.
When the electrode for an electric storage device of the present invention is used as a metal ion supply electrode, the positive electrode in the electric storage device of the present invention preferably has the following configuration.
That is, the positive electrode is preferably composed of a positive electrode current collector plate and a positive electrode active material provided in the positive electrode current collector plate.
The positive electrode current collector plate is not particularly limited, and preferably contains aluminum, nickel, copper, silver, and alloys thereof.
The positive electrode active material is not particularly limited, and examples thereof include: LiMnO2、LixMn2O4(0<x<2)、Li2MnO3、LixMn1.5Ni0.5O4(0<x<2) Lithium manganate having a layered structure or lithium manganate having a spinel structure; LiCoO2、LiNiO2Or those obtained by replacing a part of these transition metals with another metal; LiNi1/3Co1/3Mn1/3O2Lithium transition metal oxides having not more than half of the specific transition metals; these compounds are useful as lithium catalystsA transition metal oxide in which Li is in excess of the stoichiometric composition; LiFePO4And the like having an olivine structure; and so on.
In addition, a material obtained by partially substituting these metal oxides with aluminum, iron, phosphorus, titanium, silicon, lead, tin, indium, bismuth, silver, barium, calcium, mercury, palladium, platinum, tellurium, zirconium, zinc, lanthanum, or the like can be used. Particularly preferred is LiαNiβCoγAlδO2(1 ≦ α ≦ 2, β + γ + δ ≦ 1, β ≧ 0.7, γ ≦ 0.2) or LiαNiβCoγMnδO2(1≦α≦1.2、β+γ+δ＝1、β≧0.6、γ≦0.2)。
The positive electrode active material may be used alone or in combination of 2 or more.
When the electrode for an electric storage device of the present invention is used as a metal ion supply electrode, the negative electrode in the electric storage device of the present invention preferably has the following configuration.
That is, the negative electrode is preferably composed of a negative electrode current collector plate and a negative electrode active material provided in the negative electrode current collector plate.
The negative electrode current collector plate is not particularly limited, and preferably contains aluminum, nickel, copper, silver, an alloy thereof, or the like.
The negative electrode active material is not particularly limited, and preferably contains silicon, silicon monoxide, silicon dioxide, carbon, or the like.
When the electrode for an electric storage device of the present invention is used as a metal ion-supplying electrode, the separator in the electric storage device of the present invention is not particularly limited, and a porous film such as polypropylene or polyethylene, or a nonwoven fabric may be used. Further, as the separator, a member obtained by laminating these may be used. In addition, polyimide, polyamide imide, polyvinylidene fluoride (PVDF), Polytetrafluoroethylene (PTFE), cellulose, and glass fiber, which have high heat resistance, can be used. In addition, a fabric separator in which these fibers are bundled into a thread and woven may also be used.
When the electrode for an electric storage device of the present invention is used as a metal ion supply electrode, the electrolyte solution in the electric storage device of the present invention is not particularly limited, and a solution obtained by dissolving a metal salt as an electrolyte in a solvent may be used.
Examples of the solvent include cyclic carbonates such as Propylene Carbonate (PC), Ethylene Carbonate (EC), Butylene Carbonate (BC), and Vinylene Carbonate (VC), chain carbonates such as dimethyl carbonate (DMC), diethyl carbonate (DEC), methylethyl carbonate (EMC), and dipropyl carbonate (DPC), aliphatic carboxylic acid esters such as methyl formate, methyl acetate, and ethyl propionate, γ -lactones such as γ -butyrolactone, chain ethers such as 1, 2-Diethoxyethane (DEE) and ethoxymethoxyethane (EME), cyclic ethers such as tetrahydrofuran and 2-methyltetrahydrofuran, dimethyl sulfoxide, 1, 3-dioxolane, formamide, acetamide, dimethylformamide, acetonitrile, propionitrile, nitromethane, ethyl monoglyme, phosphotriester, trimethoxymethane, and dioxolane derivatives, Aprotic organic solvents such as sulfolane, methylsulfolane, 1, 3-dimethyl-2-imidazolidinone, 3-methyl-2-oxazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, diethyl ether, 1, 3-propane sultone, anisole, N-methylpyrrolidone, and fluorinated carboxylic acid esters.
These solvents may be used alone or in combination of 2 or more.
The metal salt is not particularly limited, and a lithium salt, a sodium salt, a calcium salt, a magnesium salt, and the like can be used.
When a lithium salt is used as the metal salt, LiPF is an example of the lithium salt6、LiAsF6、LiAlCl4、LiClO4、LiBF4、LiSbF6、LiCF3SO3、LiC4F9CO3、LiC(CF3SO2)2、LiN(CF3SO2)2、LiN(C2F5SO2)2、LiB10Cl10Lower aliphatic carboxylic acid lithium, boron lithium chloride, lithium tetraphenyl borate, LiBr, LiI, LiSCN, LiCl, imide, etc.
These metal salts may be used singly or in combination of 2 or more.
The electrolyte concentration of the electrolyte solution is not particularly limited, but is preferably 0.5 to 1.5 mol/L.
When the electrolyte concentration is less than 0.5mol/L, it is difficult to obtain sufficient conductivity of the electrolyte.
When the electrolyte concentration is more than 1.5mol/L, the density and viscosity of the electrolyte solution tend to increase.
The manner of housing the positive electrode, the negative electrode, the metal ion-supplying electrode, and the separator when the electrode for an electric storage device of the present invention is used as the metal ion-supplying electrode will be described with reference to the drawings.
Fig. 7 is a cross-sectional view schematically showing an example of the power storage device of the present invention.
As shown in fig. 7, the power storage device 201 is configured by housing a positive electrode 250, a negative electrode 280, a separator 260 for separating the positive electrode 250 and the negative electrode 280, and a power storage device electrode 210 as a metal ion supply electrode for doping metal ions in a power storage case 290.
The separator 260 is impregnated with an electrolyte.
As shown in fig. 7, in the power storage device 201, 2 power storage device electrodes 210 are disposed at the outermost portion of the power storage case 290.
The power storage case 290 is a laminate type sealed in a film, and the bent portion 225 of the electrode 210 for a power storage device is positioned so as to follow the bent portion of the power storage case 290.
As shown in fig. 7, 2 or more positive electrodes 250, separators 260, and negative electrodes 280 are arranged in this order between 2 power storage device electrodes 210. The positive electrodes 250 are electrically connected by a lead 251, and the negative electrodes 280 are electrically connected by a lead 281.
In the power storage device 201, the power storage device electrode 210 is preferably configured in the same manner as the power storage device electrode 10 as an example of the present invention.
In the power storage device 201 having such a configuration, the electrode 210 for the power storage device is positioned at the outermost portion of the power storage case 290.
The current collector plate of the electrode 210 for an electric storage device is made of stainless steel containing an austenite structure including a martensite structure, and therefore has high strength. Therefore, the strength of the entire power storage device 201 is also increased.
Further, since the outermost portion is made of austenitic stainless steel containing a martensite structure, the strength against nail penetration and the like is enhanced, and the safety is sufficiently improved.
Industrial applicability
The electrode for an electric storage device of the present invention can be suitably used as a positive electrode, a negative electrode, or a metal ion-supplying electrode for doping metal ions of an electric storage device.
Description of the symbols
10. 110, 210 electrode for electricity storage device
20. 120 collector plate
21. 121 electrode part arrangement region
22. 122 non-arrangement area of electrode part
25a, 25b, 125, 225 bend
26 martensite structure
27 austenitic structure
28a cut
28b perforation
28c cut-away portion
30. 130 electrode part
150. 250 positive electrode
160. 260 baffle
170. 171, 172 layered body
201 electric storage device
251. 281 lead wire
280 negative electrode
290 electric power storage case

Claims (9)

1. An electrode for an electric storage device, comprising a collector plate having an electrode portion disposition region and an electrode portion non-disposition region, and an electrode portion disposed in the electrode portion disposition region,
the collector plate is formed of stainless steel having an austenitic structure including a martensitic structure,
the electrode section contains silicon as an active material,
the collector plate includes a bent portion in the electrode portion non-arrangement region.
2. The electrode for an electric storage device according to claim 1, wherein the martensite structure is dispersed in island shapes in the austenite structure in a cross section of the collector plate other than the bent portion, the cross section being cut in a thickness direction.
3. The electrode for an electricity storage device according to claim 1 or 2, wherein,
the number of the electrode part configuration areas is more than 2,
the bent portion is located between the adjacent electrode portion disposition regions.
4. The electrode for an electric storage device according to any one of claims 1 to 3, wherein the bent portion is formed of stainless steel containing only an austenite structure.
5. The electrode for an electric storage device according to any one of claims 1 to 4, wherein a notch is formed in the bent portion.
6. The electrode for an electric storage device according to any one of claims 1 to 5, wherein a through hole is formed in the bent portion.
7. The electrode for an electric storage device according to any one of claims 1 to 6, wherein the bent portion has a cut-out portion.
8. The electrode for an electricity storage device according to any one of claims 1 to 7, wherein the active material contains only silicon.
9. An electric storage device comprising the electrode for an electric storage device according to any one of claims 1 to 8.
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