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CN105655150A - Electrochemical power supply electrode - Google Patents

Electrochemical power supply electrode Download PDF

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Publication number
CN105655150A
CN105655150A CN201610113996.6A CN201610113996A CN105655150A CN 105655150 A CN105655150 A CN 105655150A CN 201610113996 A CN201610113996 A CN 201610113996A CN 105655150 A CN105655150 A CN 105655150A
Authority
CN
China
Prior art keywords
collector
power source
electrochemical power
active material
projection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610113996.6A
Other languages
Chinese (zh)
Inventor
薛龙均
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongyang Yuanjiang Electrical Co Ltd
Original Assignee
Dongyang Yuanjiang Electrical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongyang Yuanjiang Electrical Co Ltd filed Critical Dongyang Yuanjiang Electrical Co Ltd
Priority to CN201610113996.6A priority Critical patent/CN105655150A/en
Publication of CN105655150A publication Critical patent/CN105655150A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/66Current collectors
    • H01G11/70Current collectors characterised by their structure
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00Electrodes
    • H01M4/02Electrodes composed of, or comprising, active material
    • H01M4/64Carriers or collectors
    • H01M4/70Carriers or collectors characterised by shape or form
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/02Details
    • H01M8/0202Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0247Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/50Fuel cells

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Abstract

The invention relates to an electrochemical power supply electrode formed by compositing active material layers and a current collector. Three-dimensional protrusions are formed on the surface of the current collector, each protrusion is of a hollow structure with the two ends opened, the openings at the bottom ends of the protrusions are connected with the current collector in an opened mode, penetrating holes are formed in the current collector, and the protrusions are arranged on the two sides of the current collector in a staggered mode. By means of the three-dimensional protrusion structure, the bonding force between the active material layers and the current collector is increased, the electrode density is increased, the internal resistance is reduced, and performance promoting and service life prolonging of an electrochemical power supply are facilitated.

Description

A kind of electrochemical power source electrode
Technical field
The present invention relates to electrochemical field, particularly, the present invention relates to a kind of electrochemical power source electrode, this electrode can be applicable to multiple electrochemical power source, comprises ultracapacitor, lithium-ion capacitor, mixed capacitor, fuel cell and lithium ion battery.
Background technology
Electrochemical power source is a kind of stored energy and releasing device, it carries out the conversion of energy by the mode of physics or chemistry, for various electricity consumption facilities provide energy source and power, relate to the many aspects of social life, there is portability and ease of use, be widely used in the fields such as electronic product, electric tool, wind energy, solar energy, automobile, aviation. This electrochemical power source comprises ultracapacitor, lithium-ion capacitor, mixed capacitor, fuel cell and lithium ion battery etc.
Electrode is the core parts of electrochemical power source, is the key factor that affects electrochemical power source performance. Electrode is composited by active material layer and collector. Active material layer comprises active material, conductive agent and binding agent, and wherein active material is the main material of electrode, for capacity is provided; Conductive agent is for improving the electric conductivity of electrode; Binding agent is for being bonded together active material, conductive agent and collector, and collector is used for supporting active material layer and electron transfer passage is provided.
Prior art is all generally that active material layer is compounded on ganoid collector and makes electrode, there is following defect in this technology: 1, the adhesion strength of active material layer and collector is inadequate, with the prolongation of service time, charge and discharge cycles increased frequency, part active material can come off from collector, affects electrode performance and life-span; 2, collector and active material are Surface Contact, and contact area is limited, and internal resistance is bigger than normal; 3, when electrode is assembled into electrochemical power source, need to electrode roll around or be superimposed as contact utmost point group comparatively closely, will cause fluid injection time electrolyte be difficult to infiltrate utmost point group inside, along with the carrying out of charge and discharge cycles, electrode interior electrolyte scarcity, causes electrochemical power source performance to reduce or damages; 4, in prior art, for solving active material and collector adhesion strength and internal resistance problem, some technique is to be situated between to introduce one deck conducting resinl again, but the introducing of conducting resinl has increased the cost such as manufacturing process and material, equipment, and increases the chance of introducing impurity; 5, in prior art, some technique is to produce by physics or chemical means the hole of running through or not running through on collector, and the problems referred to above are had to certain improvement, but effect is not too obvious.
Summary of the invention
In order to solve the deficiencies in the prior art, not only electrode performance is good, the life-span is long to the invention provides one, and internal resistance is little, power source performance is not easy the electrochemical power source electrode that reduces or damage.
The present invention realizes in the following manner: a kind of electrochemical power source electrode, and by active material layer with collector is compound forms. Described collection liquid surface has 3 D stereo projection; Described projection is the hollow structure of both ends open; The opening of described bump bottom ends is connected with collector is open, and forms the hole running through on collector; Described projection is staggered in collector both sides.
As preferably, the ratio that the area of described hole accounts for collector area is 10-80%. The rapid osmotic of electrolyte when the existence of hole is beneficial to fluid injection on collector, and can make electrolyte fully enter electrode group inside, prevent with charge and discharge cycles carry out and the deficient phenomenon of electrolyte that occurs. Pore structure can also alleviate the quality of collector, thereby alleviates electrochemical power source quality, is beneficial to lightness and the miniaturization of electrochemical power source.
As preferably, the centre-to-centre spacing between described hole is 0.05-1mm. The active material that is positioned at the upper and lower both sides of collector can be realized directly contact by open projection, is beneficial to ionic conduction, reduces internal resistance.
As preferably, described projection is the 5%-50% of active material layer thickness perpendicular to the height of collection liquid surface. Compound tense part active material enters protruding hollow space, increases active material and collector contact area, increases electrode density, and improves adhesion, extends electrode life, reduces consumption of binder, reduces internal resistance.
As preferably, the generation type of described projection comprise to collector shear, punching press, burn into laser. Projection, for collector itself is processed, forms without additionally collector being introduced to other materials, thereby reduces material cost and the probability of introducing impurity.
As preferably, described collector material comprises copper, aluminium, nickel, steel.
As preferably, the described compound mode of action comprises static, pressure, heat, printing, coating. Active material layer can increase cohesive force with the collector with three-dimensional projection is compound, thereby can select to be more applicable to and flexile complex method according to material behavior, expands the material scope of application of active material.
A kind of electrochemical power source, the electrochemical power source electrode that electrode uses this invention technology to provide is provided.
As preferably, described electrochemical power source comprises ultracapacitor, lithium-ion capacitor, mixed capacitor, fuel cell and lithium ion battery. The technology of the present invention is applicable to above-mentioned electrochemical power source. It should be noted that, the technology of the present invention is particularly useful for lithium-ion capacitor. Its collector of technological requirement of the pre-embedding lithium of lithium-ion capacitor must have through hole to provide migrating channels to lithium ion, prior art is all that collector additional processing is formed to through hole, and the lithium ion of the technology of the present invention can, directly by the open hollow part transmission of 3 D stereo projection, complete pre-embedding lithium.
Beneficial effect of the present invention: improve the adhesion of active material layer and collector, extend electrochemical power source service life; Increase the active material quality of unit are, increase electrode density, raising capacity, energization density; Reduce consumption of binder, reduce internal resistance, improve power density; Alleviate collector quality, reduce electrochemical power source quality or volume; Reduce power module quantity or volume, be beneficial to power module lightness and miniaturization, reduce costs; Be beneficial to electrolyte and infiltrate rapidly electrode interior, prevent electrolyte scarcity; The technology of the present invention is particularly useful for lithium-ion capacitor.
Brief description of the drawings
Fig. 1 is a kind of electrochemical power source electrode sectional structure schematic diagram of the present invention;
Fig. 2 is the sectional structure schematic diagram of prior art electrode;
In figure; 1, active material layer, 2, collector, 3, projection, 4, hole, 5, common collector.
Detailed description of the invention
Below in conjunction with specification drawings and specific embodiments, substantive distinguishing features of the present invention is further described.
A kind of electrochemical power source electrode as shown in Figure 1, by active material layer 1 with collector 2 is compound forms. There is 3 D stereo projection 3 on described collector 2 surfaces; Described projection is the hollow structure of both ends open; The opening of described bump bottom ends is connected with collector is open, and forms the hole 4 running through on collector; Described projection is staggered in collector both sides. Described projection is the cube of hollow, can regular or irregular shape, can give an example as mountain peak shape, fibrous etc. Described protruding both ends open can be rule and irregular various geometries, can give an example as circular, oval etc. Collector material comprises copper, aluminium, nickel, steel etc. Described projection be by collector itself is sheared, the mode such as punching press, burn into laser processes.
Fig. 2 is the sectional structure schematic diagram of prior art electrode. Common collector is ganoid slab construction. Comparison diagram 1 and Fig. 2, can obviously see, the electrode of the technology of the present invention, and active material can enter the hollow bumps inside on collector, increases the active material of unit are, increases electrode density, raising capacity and energy density. And the two ends that the active material that is positioned at the upper and lower both sides of collector can be opened by projection directly contact, be beneficial to the conduction of ion, reduce internal resistance.
The ratio that the area of described hole accounts for collector area is preferably 10-80%. On collector, the existence of hole is beneficial to note increases unit are active material quality, and can make electrolyte fully enter fast electrode interior. Meanwhile, pore structure can also alleviate the quality of collector, thereby alleviates electrochemical power source quality, is beneficial to lightness and the miniaturization of electrochemical power source.
The preferred 5-100um of thickness of described collector, more specifically, preferably 8-50um. Described projection is preferably the 5%-50% of active material layer thickness perpendicular to the height of collection liquid surface, concrete height number is preferably 5-80um. The concrete numerical value of height can be determined according to practical condition adjustment, all should be considered as specific embodiments of the invention.
The compound various ways such as static, pressure, heat, printing, coating that can pass through of active material layer and collector are realized. Concrete complex method can be determined according to material behavior and Production requirement, all should be considered as specific embodiments of the invention. In addition, before compound, can carry out pretreatment to collector. Particularly, can give an example as, scribble in advance intermediate layer at collection liquid surface, the main component of described intermediate layer is conductive materials and binding agent, can further increase the simultaneously further reduction internal resistance of bond strength of active material layer and collector.
Electrochemical power source electrode of the present invention is applicable to field of electrochemical power source, comprises the fields such as ultracapacitor, lithium-ion capacitor, mixed capacitor, fuel cell and lithium ion battery. Technical scheme of the present invention is particularly useful for lithium-ion capacitor field. Lithium-ion capacitor is due to the particular/special requirement of its pre-embedding lithium technique, in the time of assembling, need to pack lithium sheet in utmost point group one side in advance, then lithium ion will embed in every layer of active material through collector, thereby this just requires collector must have through hole to provide migrating channels for lithium ion. Prior art is all that collector additional processing is formed to through hole, and the lithium ion of the technology of the present invention can, directly by the open hollow part transmission of 3 D stereo projection, can complete pre-embedding lithium without additional processing.
The invention is not restricted to above-mentioned embodiment, but can in scope of the present invention as claimed in claim, carry out various improvement. These improvement are included within the scope of the present invention.
Embodiment
Embodiment 1
Active carbon and conductive carbon black and polytetrafluoroethylene (PTFE) mix and blend, be pressed into the carbon film of thickness 100um. It is 80% that collector adopts porosity, and hole centre-to-centre spacing is 0.05mm, the aluminium foil that thickness is 20um, and the vertical height of projection is 50um. Carbon film is pressed on aluminium foil by roller, obtains activated carbon electrodes.
Embodiment 2
Lithium titanate and conductive carbon black and Kynoar are mixed to join in crassitude ketone solvent and stir into slurry. It is 50% that collector adopts porosity, and hole centre-to-centre spacing is 1mm, the Copper Foil that thickness is 8um, and the vertical height of projection is 20um. Slurry is coated on Copper Foil, and obtaining active material layer thickness is the lithium titanate electrode of 80um.
Embodiment 3
Graphene and conductive black and acrylic resin are mixed to form uniform granulate mixture. It is 60% that collector adopts porosity, and hole centre-to-centre spacing is 0.4mm, the nickel foil that thickness is 30um, and the vertical height of projection is 16um. Granulate mixture is sprayed on nickel foil by electrostatic interaction, forms the Graphene electrodes that active material layer thickness is 160um.
Embodiment 4
Graphite, conductive agent, polyvinylpyrrolidone are mixed to join and in water, stir into slurry. It is 10% that collector adopts porosity, and hole centre-to-centre spacing is 0.8mm, the aluminium foil that thickness is 15um, and the vertical height of projection is 5um. Slurry printing is shifted on aluminium foil, obtained the graphite electrode that active material layer thickness is 20um.
Embodiment 5
Active carbon and conductive carbon black and polytetrafluoroethylene (PTFE) mix and blend, be first pressed into the carbon film of thickness 200um. It is 80% that collector adopts porosity, and hole centre-to-centre spacing is 0.1mm, the stainless steel that thickness is 30um, and the vertical height of projection is 10um. In advance at the thick intermediate layer of stainless steel surfaces coating 5um. Then carbon film is heat sealing on the aluminium foil that scribbles intermediate layer by the high-temperature roller of 210 DEG C, obtains activated carbon electrodes.

Claims (10)

1. an electrochemical power source electrode, by active material layer (1) and the compound formation of collector (2), there is 3 D stereo projection (3) on described collector (2) surface; Described projection is the hollow structure of both ends open; The opening of described bump bottom ends is connected with collector is open, and forms the hole (4) running through on collector; Described projection is staggered in collector both sides.
2. a kind of electrochemical power source electrode as claimed in claim 1, the ratio that the area that it is characterized in that described hole accounts for collector area is 10-80%.
3. a kind of electrochemical power source electrode as claimed in claim 1, is characterized in that the centre-to-centre spacing between described hole is 0.05-1mm.
4. a kind of electrochemical power source electrode as claimed in claim 1, is characterized in that described projection is the 5%-50% of active material layer thickness perpendicular to the height of collection liquid surface.
5. a kind of electrochemical power source electrode as claimed in claim 1, the mode that convexes to form described in it is characterized in that comprise to collector shear, punching press, burn into laser.
6. a kind of electrochemical power source electrode as claimed in claim 1, is characterized in that described collector material comprises copper, aluminium, nickel, steel.
7. a kind of electrochemical power source electrode as claimed in claim 1, is characterized in that the described compound mode of action comprises static, pressure, heat, printing, coating.
8. an electrochemical power source, is characterized in that electrode is by active material layer (1) and the compound formation of collector (2).
9. there is 3 D stereo projection (3) on collector described in (2) surface; Described projection is the hollow structure of both ends open; The opening of described bump bottom ends is connected with collector is open, and forms the hole (4) running through on collector; Described projection is staggered in collector both sides.
10. a kind of electrochemical power source as claimed in claim 8, is characterized in that described electrochemical power source comprises ultracapacitor, lithium-ion capacitor, mixed capacitor, fuel cell and lithium ion battery.
CN201610113996.6A 2016-03-01 2016-03-01 Electrochemical power supply electrode Pending CN105655150A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610113996.6A CN105655150A (en) 2016-03-01 2016-03-01 Electrochemical power supply electrode

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Application Number Priority Date Filing Date Title
CN201610113996.6A CN105655150A (en) 2016-03-01 2016-03-01 Electrochemical power supply electrode

Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107731546A (en) * 2017-09-29 2018-02-23 程杰 A kind of activated carbon electrodes and preparation method thereof
CN108281595A (en) * 2018-01-23 2018-07-13 青岛宏德精密机械有限公司 A kind of lithium battery liner plate and its processing technology

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090269677A1 (en) * 2008-04-23 2009-10-29 Sony Corporation Anode and secondary battery
CN202259533U (en) * 2011-09-02 2012-05-30 深圳市格瑞普电池有限公司 Pole piece of lithium ion battery and lithium ion battery
CN204118183U (en) * 2014-08-01 2015-01-21 中国电子科技集团公司第十八研究所 The three-dimensional current collector structure of lithium primary battery negative plate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090269677A1 (en) * 2008-04-23 2009-10-29 Sony Corporation Anode and secondary battery
CN202259533U (en) * 2011-09-02 2012-05-30 深圳市格瑞普电池有限公司 Pole piece of lithium ion battery and lithium ion battery
CN204118183U (en) * 2014-08-01 2015-01-21 中国电子科技集团公司第十八研究所 The three-dimensional current collector structure of lithium primary battery negative plate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107731546A (en) * 2017-09-29 2018-02-23 程杰 A kind of activated carbon electrodes and preparation method thereof
CN108281595A (en) * 2018-01-23 2018-07-13 青岛宏德精密机械有限公司 A kind of lithium battery liner plate and its processing technology

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Application publication date: 20160608