[go: up one dir, main page]

CN113659104A - Preparation method of battery active layer, battery pole piece and application - Google Patents

Preparation method of battery active layer, battery pole piece and application Download PDF

Info

Publication number
CN113659104A
CN113659104A CN202110921098.4A CN202110921098A CN113659104A CN 113659104 A CN113659104 A CN 113659104A CN 202110921098 A CN202110921098 A CN 202110921098A CN 113659104 A CN113659104 A CN 113659104A
Authority
CN
China
Prior art keywords
battery
lithium
mass
active layer
carbon
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
CN202110921098.4A
Other languages
Chinese (zh)
Inventor
肖强
秦士林
张耀法
马忠龙
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.)
Svolt Energy Technology Wuxi Co Ltd
Original Assignee
Svolt Energy Technology Wuxi 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 Svolt Energy Technology Wuxi Co Ltd filed Critical Svolt Energy Technology Wuxi Co Ltd
Priority to CN202110921098.4A priority Critical patent/CN113659104A/en
Publication of CN113659104A publication Critical patent/CN113659104A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

本发明提供了一种电池活性层的制备方法、电池极片和应用，所述电池活性层的制备方法包括：将活性材料和导电剂干法混合后，加入纤维化粘结剂并进行纤维化处理，干法工艺得到的混合物料进行辊压成膜后，形成所述的电池活性层；所述活性材料中包括碳包覆的预锂材料。本发明利用干法混合的活性材料与导电剂混合后，再加入纤维化粘结剂进行纤维化处理，结合碳包覆的预锂材料，使极片具有柔软和平整的特点，提高电池的倍率性能。

Figure 202110921098

The invention provides a preparation method of a battery active layer, a battery pole piece and applications. The preparation method of the battery active layer includes: after dry mixing an active material and a conductive agent, adding a fibrillating binder and performing fibrillation After the mixed material obtained by the dry process is rolled into a film, the battery active layer is formed; the active material includes a carbon-coated pre-lithium material. The present invention utilizes dry mixed active material and conductive agent to be mixed, and then adds fibrillation binder for fibrillation treatment, combined with carbon-coated pre-lithium material, so that the pole piece has the characteristics of softness and smoothness, and the rate of the battery is improved. performance.

Figure 202110921098

Description

Preparation method of battery active layer, battery pole piece and application
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a battery active layer, a battery pole piece and application.
Background
With the rapid development of new energy vehicles, the requirements on the energy density and the safety performance of the power battery for vehicles are continuously improved. In order to realize further breakthrough of energy density of the power battery, the search for high-specific-capacity positive/negative electrode materials becomes the key point of power battery development. However, graphite is mainly used as a negative electrode of the conventional lithium ion battery, and the specific capacity limit of graphite negative electrode materials is about 372mAh/g, so that the energy density of the lithium ion battery is difficult to further improve based on the negative electrode materials, and the lithium ion battery is difficult to adapt to the requirement of the market on the lithium ion battery with higher energy density, and therefore more and more high-specific capacity materials are applied to pole pieces.
Therefore, the negative electrode pre-lithium technology becomes an effective way for improving the first effect and the capacity of the negative electrode, and more companies and research institutes are making research and technical breakthrough in this aspect at present. However, the conventional negative electrode pre-lithium technology has the problems of high difficulty, high risk, high cost and the like, and is difficult to popularize and apply on a large scale at present.
CN108288690A discloses a negative electrode of a lithium solid-state battery, and a preparation method and an application thereof, where the negative electrode includes a negative electrode current collector and a negative electrode material loaded on the negative electrode current collector, where the negative electrode material includes: a composite negative electrode active material containing metal lithium, a conductive additive, and a binder. The negative electrode provided by the invention is used in a lithium solid-state battery, so that the energy density and the safety performance of the lithium ion battery can be improved, and the problems of material pulverization, interface contact and the like are effectively relieved due to the negative electrode, so that the prepared lithium solid-state battery has better cycle performance than a lithium solid-state battery using pure metal lithium as the negative electrode.
CN112349956A discloses a solid-state battery and a manufacturing method thereof, comprising the following steps: uniformly mixing a positive active substance, a conductive agent, a binder and lithium salt, dissolving the mixture in an organic solvent to obtain positive slurry, coating the slurry on an aluminum foil after magnetic stirring, and performing vacuum drying, tabletting and other steps to obtain a positive electrode; adding lithium salt into a solvent, stirring uniformly, then sequentially adding a polymer material and an inorganic filler, and stirring uniformly to obtain a mixed slurry; coating the mixed slurry on a nanofiber membrane, and standing, vacuum drying and the like to obtain a composite electrolyte membrane; and coating the composite electrolyte slurry on the surface of the negative electrode, and drying the solvent to obtain the negative electrode. And assembling the positive electrode, the solid electrolyte and the negative electrode to obtain the solid battery. The solid-state battery prepared by the method can effectively increase the compatibility of the electrolyte and the electrode interface, can increase the mechanical property of the electrolyte, and effectively improves the problem of lithium precipitation of the negative electrode.
In the prior art, the pole piece of the solid-state battery has the problems of complex preparation process, high cost, low safety performance and the like, so that the pole piece of the solid-state battery can also ensure low cost and high safety performance under the condition of ensuring simple preparation process, and becomes a problem which needs to be solved urgently at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of a battery active layer, a battery pole piece and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for preparing a battery active layer, the method comprising:
mixing an active material and a conductive agent by a dry method, adding a fiberization binder and performing fiberization treatment, and rolling the mixed material obtained by the dry method process into a film to form the battery active layer; the active material includes a carbon-coated pre-lithium material.
According to the invention, the fiberization binder is added, the fiberization treatment is carried out together with the active material and the conductive agent, and the carbon-coated pre-lithium material is combined, because the surface of the pre-lithium material is coated with a layer of carbon and has a smooth surface, the physical property of the surface of the lithium-silicon alloy is further improved by the fibers formed by the binder, the prepared negative pole piece is smooth, soft and flat, the film forming effect of the pole piece is improved, the rate capability of the lithium-supplement negative pole is improved, and the problems that the surface of the negative pole is locally high, the diaphragm is pierced to form a micro short circuit and the charging curve is abnormal due to the fact that the pre-lithium material has large particles and hard hardness and is attached to the negative pole to form dendrites after lithium is separated out are solved. In addition, the method does not need inert gas for protection, adds the carbon-coated pre-lithium material in the mixing stage, has simple operation and easy industrialization, has the characteristics of high first efficiency and high capacity compared with a graphite cathode, and can be used for preparing a high-energy-density battery.
It should be noted that the material of the current collector is not specifically required or limited, and those skilled in the art can reasonably select the current collector according to the design requirements, for example, a carbon-coated copper foil.
As a preferred technical scheme of the invention, the preparation method is carried out in a dry environment.
Preferably, a non-fiberization binder is also added during the dry mixing of the active material and the conductive agent.
Preferably, the non-fiberizing binder comprises one or a combination of at least two of polyvinylidene fluoride, carboxymethyl cellulose or styrene butadiene rubber.
Preferably, the mass of the non-fiberized binder is 0 to 10% of the mixture, for example, 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%, and more preferably 0.5 to 5%.
The non-fiberization binder and the fiberization binder are matched for use, wherein the non-fiberization binder is heated and melted during hot rolling to be molten and covered on the surface of the active material, so that the surface physical property of the active material is improved, the conductive agent can be well adhered, a good conductive path is formed, and the conductivity is improved; the fiberization binder is formed into filamentous fibers after fiberization, so that different active materials, conductive agents and the like can be bonded together to form an integral block-shaped or sheet-shaped solid. Through the different bonding forms of two kinds of binders, realize even stable adhesion effect, effectively avoid the emergence of gluing link piece scheduling problem among the mixing process, further improve the compliance and the film forming effect of pole piece. Compared with the traditional method that only non-fibrous binder is used and solvent is added to promote the bonding effect of the binder, the method has the advantages that the addition of the fibrous binder plays a role in bonding, the addition of the solvent is not needed, the solvent recovery and drying processes are omitted, the preparation process is simplified, and the cost is saved.
Preferably, the fiberized binder comprises one or a combination of at least two of polytetrafluoroethylene, polyimide, polypropylene or polyethylene.
Preferably, the mass of the fiberized binder is 0.1 to 30% of the mixture, for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, or 30%, and more preferably 0.5 to 10%.
According to the invention, the mass of the fiberization binder is 0.1-30% of the mixed material, and is further preferably 0.5-10%, so that the pole piece has a good film forming effect under the condition of ensuring the softness and the smoothness of the pole piece, and if the mass is lower than 0.1% of the mixed material, the fiberization drawing generated by the fiberization binder is insufficient, the bonding effect between the active materials is poor, and the film forming effect of the pole piece is poor; if the mass is higher than 30% of the mixed material, the addition amount of the fiberization binder is too high, which affects the proportion of the active material and further affects the battery performance.
In a preferred embodiment of the present invention, the fiberization treatment includes one or a combination of at least two of grinding, ball milling, and defoaming, and more preferably grinding, and the fiberization treatment fiberizes the fiberization binder and forms a mixture having a block-like or sheet-like structure with the active material and the conductive agent.
The invention adopts grinding as the fiberization treatment mode, which is a mode that is simpler and easier than high-speed stirring, airflow pulverization and the like and has better fiberization effect.
As a preferred embodiment of the present invention, the pre-lithium material includes one or a combination of at least two of lithium silicon alloy, silicon, and silicon monoxide, and more preferably lithium silicon alloy.
The invention adopts the lithium-silicon alloy as the lithium supplement additive, the theoretical capacity of the lithium-silicon alloy reaches more than 1800mAh/g, but the lithium-silicon alloy is more active and is easy to react with water violently, so that the safety problem is caused.
Preferably, the mass ratio of the carbon-coated pre-lithium material in the active material is 0.1-60%, such as 0.1%, 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, and more preferably 5-40%.
Preferably, the carbon-coated pre-lithium material comprises 0.5 to 50% by mass of carbon, for example 0.5%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%, more preferably 1 to 10%.
Preferably, the atomic number ratio of Li to Si in the lithium silicon alloy is (0-4.4): 1, for example, 0.4:1, 0.8:1, 1.2:1, 1.6:1, 2.0:1, 2.4:1, 2.8:1, 3.2:1, 3.6:1, 4.0:1 or 4.4: 1.
Preferably, the lithium silicon alloy includes Li4.4Si、Li3.25Si or Li1.71One or a combination of at least two of Si.
As a preferred embodiment of the present invention, the active material is a negative electrode active material, and the negative electrode active material further includes graphite.
Preferably, the mass ratio of graphite in the negative electrode active material is 40 to 95%, for example, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95%.
According to the invention, the mass ratio of graphite in the negative active material is set to be 40-95%, so that the lithium-silicon alloy negative electrode material has the advantages of reducing the expansion problem of the lithium-silicon alloy and improving the energy density of a pole piece, and if the mass ratio of graphite in the negative active material is lower than 40%, the expansion problem of the lithium-silicon alloy exists; if the ratio is higher than 95%, there is a problem that the energy density is not remarkably increased.
In a preferred embodiment of the present invention, the mass of the active material is 25 to 99.9% of the mass of the mixture, for example, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 99.9%, and more preferably 87.5 to 98.5%.
Preferably, the conductive agent is 0 to 5% by mass of the mixture, for example, 0%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, or 5.0%, and more preferably 1 to 2.5%.
Preferably, the conductive agent comprises one or a combination of at least two of acetylene black, Super-P, carbon nanotubes, carbon fibers, Ketjen black, a graphite conductive agent, graphene, activated carbon, and porous carbon.
As a preferred technical solution of the present invention, the rolling manner includes hot rolling, and the mixed material is rolled to form the battery active layer.
Preferably, the temperature of the hot rolling is 25 to 200 ℃, for example, 25 ℃, 30 ℃, 40 ℃, 60 ℃, 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃, 180 ℃ or 200 ℃, and more preferably 90 to 160 ℃.
As a preferred technical scheme of the invention, the preparation method specifically comprises the following steps:
the method comprises the following steps of (I) mixing an active material, a conductive agent and a non-fiberization binder in a dry method in a dry environment, adding the fiberization binder for grinding and fiberizing, and grinding the fiberization binder, the active material and the conductive agent to form a mixed material with a blocky or sheet structure, wherein the mass ratio of carbon-coated lithium-silicon alloy in the active material is 0.1-100%, the mass content of carbon-coated lithium-silicon alloy is 1-10%, and the number ratio of Li to Si atoms in the lithium-silicon alloy is (0-4.4): 1; the mass of the non-fiberization binder is 0.5-5% of the mixed material, the mass of the fiberization binder is 0.5-10% of the mixed material, the mass of the active material is 87.5-98.5% of the mixed material, and the mass of the conductive agent is 1-2.5% of the mixed material;
and (II) carrying out hot rolling on the mixed material at the temperature of 90-160 ℃ to form a battery active layer.
In a second aspect, the invention provides a battery pole piece, which comprises a current collector and a battery active layer located on at least one side surface of the current collector, wherein the battery active layer is prepared by the preparation method of the battery active layer in the first aspect.
The compounding method of the current collector and the battery active layer is hot rolling, and the temperature of the hot rolling in the compounding process is preferably 25 to 200 ℃, for example, 25 ℃, 30 ℃, 40 ℃, 60 ℃, 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃, 180 ℃ or 200 ℃.
In a preferred embodiment of the present invention, the thickness of the battery electrode plate is 30 to 500 μm, for example, 30 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm or 500 μm.
In a third aspect, the invention provides a solid-state battery, which comprises a positive electrode, a negative electrode and a diaphragm, wherein the negative electrode adopts the battery pole piece of the second aspect.
The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between non-recited numerical ranges, and is not intended to be exhaustive or to limit the invention to the precise numerical values encompassed within the range for brevity and clarity.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the fiberization binder is added, the fiberization treatment is carried out together with the active material and the conductive agent, and the carbon-coated pre-lithium material is combined, because the surface of the pre-lithium material is coated with a layer of carbon and has a smooth surface, the physical property of the surface of the lithium-silicon alloy is further improved by the fibers formed by the binder, the prepared negative pole piece is smooth, soft and flat, the film forming effect of the pole piece is improved, the rate capability of the lithium-supplement negative pole is improved, and the problems that the surface of the negative pole is locally high, the diaphragm is pierced to form a micro short circuit and the charging curve is abnormal due to the fact that the pre-lithium material has large particles and hard hardness and is attached to the negative pole to form dendrites after lithium is separated out are solved. In addition, the method does not need inert gas for protection, adds the carbon-coated pre-lithium material in the mixing stage, has simple operation and easy industrialization, has the characteristics of high first efficiency and high capacity compared with a graphite cathode, and can be used for preparing a high-energy-density battery.
Drawings
FIG. 1 is a graph of charge and discharge curves at 0.1C for example 1;
FIG. 2 is a graph showing the charge and discharge curves of comparative example 1 at 0.1C;
FIG. 3 is a graph of charge and discharge curves at 1C for example 1;
fig. 4 is a graph showing charge and discharge curves at 1C for comparative example 2.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the present invention, which is defined by the claims.
The technical solution of the present invention is further explained by the following embodiments.
Example 1
The embodiment provides a preparation method of a battery active layer, which specifically comprises the following steps:
(I) mixing 8.7g of graphite, 1g of carbon-coated lithium silicon alloy and 0.1g of polyvinylidene fluoride in a dry method in a dry environment, adding 0.2g of polytetrafluoroethylene for grinding and fiberizing to enable the polytetrafluoroethylene to be fiberized, and grinding the polytetrafluoroethylene and an active material to form a mixed material with a blocky or sheet structure, wherein the mass percentage of the carbon-coated lithium silicon alloy in the active material is 10.3%, the mass content of carbon coated in the carbon-coated lithium silicon alloy is 5%, and the lithium silicon alloy is Li3.25Si; the mass of the polyvinylidene fluoride is 1 percent of that of the mixed material, the mass of the polytetrafluoroethylene is 2 percent of that of the mixed material, and the mass of the active material is 97 percent of that of the mixed material;
and (II) hot rolling the mixed material at 100 ℃ to form a battery active layer.
The embodiment also provides a battery pole piece, wherein the battery pole piece is formed by hot rolling and compounding the battery active layer and a current collector at 100 ℃ to form a 200-micron battery pole piece.
Example 2
The embodiment provides a preparation method of a battery active layer, which specifically comprises the following steps:
in a dry environment, 1g of graphite, 7.7g of carbon-coated lithium silicon alloy, 0.2g of acetylene black and 0.1g of carboxymethyl cellulose are mixed in a dry method, then 1g of polyimide is added for grinding and fiberizing treatment, the polyimide is fiberized and ground with an active material and a conductive agent to form a mixed material with a blocky or sheet structure, wherein the mass percentage of the carbon-coated lithium silicon alloy in the active material is 88.5 percent, the mass content of carbon coated in the carbon-coated lithium silicon alloy is 10 percent, and the lithium silicon alloy is Li1.71Si; the mass of the carboxymethyl cellulose is 1% of the mixed material, the mass of the polyimide is 10% of the mixed material, the mass of the active material is 87% of the mixed material, and the mass of the conductive agent is 2% of the mixed material;
and (II) carrying out hot rolling on the mixed material at 90 ℃ to form a battery active layer.
The embodiment also provides a battery pole piece, wherein the battery pole piece is formed by hot rolling and compounding the battery active layer and a current collector at 90 ℃ to form the battery pole piece with the thickness of 50 mu m.
Example 3
The embodiment provides a preparation method of a battery active layer, which specifically comprises the following steps:
mixing 9g of carbon-coated lithium silicon alloy, 0.5g of carbon nano tube and 0.5g of polyvinylidene fluoride in a dry method in a dry environment, then adding 0.5g of polypropylene for grinding and fiberizing treatment to fiberize the polypropylene, and grinding the polypropylene, the active material and the conductive agent to form a mixed material with a blocky or sheet structure, wherein the mass percentage of the carbon-coated lithium silicon alloy in the active material is 100 percent, the mass content of carbon coated in the carbon-coated lithium silicon alloy is 1 percent, and the lithium silicon alloy is Li4.4Si; the mass of the polyvinylidene fluoride accounts for 5 percent of the mixed material, and the mass of the polypropylene accounts for 5 percent of the mixed materialThe mass of the active material is 90% of the mass of the mixed material, and the mass of the conductive agent is 5% of the mass of the mixed material;
and (II) hot rolling the mixed material at 110 ℃ to form a battery active layer.
The embodiment also provides a battery pole piece, wherein the battery pole piece is formed by hot rolling and compounding the battery active layer and a current collector at 110 ℃ to form the battery pole piece with the thickness of 500 mu m.
Example 4
The embodiment provides a preparation method of a battery active layer, which specifically comprises the following steps:
in a dry environment, 0.7g of graphite, 5g of carbon-coated lithium silicon alloy, 0.3g of graphene and 1g of polyvinylidene fluoride are mixed in a dry method, then 3g of polyethylene is added for grinding and fiberizing treatment to enable the polyethylene to be fiberized, and the polyethylene is ground with an active material and a conductive agent to form a mixed material with a blocky or sheet structure, wherein the mass percentage of the carbon-coated lithium silicon alloy in the active material is 87.7%, the mass content of carbon coated in the carbon-coated lithium silicon alloy is 40%, and the lithium silicon alloy is Li2.2Si; the mass of the polyvinylidene fluoride is 10% of that of the mixed material, the mass of the polyethylene is 30% of that of the mixed material, the mass of the active material is 57% of that of the mixed material, and the mass of the conductive agent is 3% of that of the mixed material;
(II) hot rolling the mixed material at 110 ℃ to form a battery active layer,
the embodiment also provides a battery pole piece, wherein the battery pole piece is formed by hot rolling and compounding the battery active layer and a current collector at 100 ℃ to form the battery pole piece with the diameter of 300 mu m.
Example 5
The embodiment provides a preparation method of a battery active layer, which specifically comprises the following steps:
in a dry environment, 8g of graphite, 0.5g of carbon-coated lithium-silicon alloy, 0.2g of graphene and 0.6g of polyvinylidene fluoride are mixed in a dry method, 0.7g of polyethylene is added for grinding and fiberizing treatment to fiberize the polyethylene, and the polyethylene, an active material and a conductive agent are ground to form blocky or flaky knotsThe mass percentage of the carbon-coated lithium-silicon alloy in the active material is 5.8%, the mass content of the carbon-coated lithium-silicon alloy is 20%, and the lithium-silicon alloy is Li2.8Si; the mass of the polyvinylidene fluoride accounts for 6% of the mass of the mixed material, the mass of the polyethylene accounts for 7% of the mass of the mixed material, the mass of the active material accounts for 85% of the mass of the mixed material, and the mass of the conductive agent accounts for 2% of the mass of the mixed material;
and (II) hot rolling the mixed material at 110 ℃ to form a battery active layer.
The embodiment also provides a battery pole piece, wherein the battery pole piece is formed by hot rolling and compounding the battery active layer and a current collector at 100 ℃ to form the battery pole piece with the diameter of 300 mu m.
Example 6
This example provides a method for preparing an active layer of a battery, which is different from example 1 in that polyvinylidene fluoride is not added and the rest is completely the same as example 1.
Example 7
This example provides a method for preparing an active layer of a battery, which is different from example 1 in that the amount of polytetrafluoroethylene added is 1.3g, i.e., the mass of polytetrafluoroethylene is 11.7% of the mixed material, and the rest is identical to example 1.
Example 8
This example provides a method for preparing an active layer of a battery, which is different from example 1 in that the amount of polytetrafluoroethylene added is 4.5g, i.e., the mass of polytetrafluoroethylene is 31.5% of the mixed material, and the rest is identical to example 1.
Example 9
This example provides a method of preparing a battery active layer, which is different from example 1 in that 3.7g of graphite and 6g of carbon-coated lithium silicon alloy are used as active materials, and the remaining amounts are identical to example 1.
Example 10
This example provides a method of preparing a battery active layer, which is different from example 1 in that the active materials are 8.8g of graphite and 0.1g of carbon-coated lithium silicon alloy, and the rest is exactly the same as example 1.
Comparative example 1
This comparative example provides a method for preparing an active layer of a battery, which is different from example 1 in that 1g of carbon-coated lithium silicon alloy is replaced with 1g of graphite, and the remaining parameters are identical to those of example 1.
Comparative example 2
This comparative example provides a method for preparing an active layer of a battery, which is different from example 1 in that 1g of carbon-coated lithium silicon alloy is replaced with 1g of non-carbon-coated lithium silicon alloy, and the remaining parameters are identical to those of example 1.
The invention also provides a solid-state battery, wherein the pole piece in the solid-state battery is the battery pole piece prepared by the embodiment.
The pole pieces in the above examples and comparative examples were assembled to be charged with lithium, the separator was a PE film, and the electrolyte was LiPF6(concentration in electrolyte is 1mol/L) is dissolved in a mixed solution of Ethylene Carbonate (EC)/dimethyl carbonate (DEC)/Ethyl Methyl Carbonate (EMC) with a volume ratio of 1:1:1, charging and discharging are carried out at 0.1C, and then charging and discharging are carried out at 0.5C and 1C, and multiplying power performance is tested. The test results are shown in table 1. The charge and discharge curve at 0.1C for example 1 is shown in fig. 1, the charge and discharge curve at 0.1C for comparative example 1 is shown in fig. 2, the charge and discharge curve at 1C for example 1 is shown in fig. 3, and the charge and discharge curve at 1C for comparative example 2 is shown in fig. 4.
TABLE 1
Figure BDA0003207467780000121
As can be seen from the above table:
(1) compared with the example 6, the test data of the example 1 is superior to that of the example 6, so that the invention can be seen that the non-fiberization adhesive and the fiberization adhesive are adopted for matching use, wherein the non-fiberization adhesive is heated and melted to be molten to be covered on the surface of the active material when being subjected to hot rolling, the surface physical property of the active material is improved, the conductive agent can be well adhered, a good conductive path is formed, and the conductivity is improved; the fiberization binder is formed into filamentous fibers after fiberization, so that different active materials, conductive agents and the like can be bonded together to form an integral block-shaped or sheet-shaped solid. Through the different bonding forms of two kinds of binders, realize even stable adhesion effect, effectively avoid the emergence of gluing link piece scheduling problem among the mixing process, further improve the compliance and the film forming effect of pole piece. Compared with the traditional method that only non-fibrous binder is used and solvent is added to promote the bonding effect of the binder, the method has the advantages that the addition of the fibrous binder plays a role in bonding, the addition of the solvent is not needed, the solvent recovery and drying processes are omitted, the preparation process is simplified, and the cost is saved.
(2) Compared with the embodiments 7 and 8, the test data of the embodiment 1 is superior to those of the embodiments 7 and 8, so that the invention can be seen that the pole piece has a good film forming effect by setting the mass of the fiberization binder to be 0.1-30% of the mixed material, and more preferably 0.5-10%, under the condition of ensuring the flexibility and the smoothness of the pole piece, if the mass is less than 0.1% of the mixed material, the fiberization drawbench generated by the fiberization binder is insufficient, the bonding effect between the active materials is poor, and the film forming effect of the pole piece is poor; if the mass is higher than 30% of the mixed material, the addition amount of the fiberization binder is too high, which affects the proportion of the active material and further affects the battery performance.
(3) Compared with the examples 9 and 10, the test data of the example 1 is superior to those of the examples 9 and 10, and therefore, the invention has the advantages of reducing the expansion problem of the lithium-silicon alloy and improving the energy density of a pole piece by setting the mass ratio of graphite in the negative electrode active material to be 40-95%, and if the mass ratio is lower than 40%, the expansion problem of the lithium-silicon alloy exists; if the ratio is higher than 95%, there is a problem that the energy density is not remarkably increased.
(4) Compared with the comparative examples 1 and 2, the specific charge capacity, the specific discharge capacity and the initial effect of the embodiment 1 are superior to those of the comparative example 1, and the performance of the initial effect, 0.5C/0.1C and 1C/0.1C of the embodiment 1 is superior to that of the comparative example 2, so that the invention can be seen that the invention adds the fiberization adhesive, the fiberization treatment is carried out together with the active material and the conductive agent, the carbon-coated pre-lithium material is combined, because the surface of the pre-lithium material is coated with a layer of carbon and has smooth surface, the fiber formed by the adhesive further improves the surface physical property of the lithium-silicon alloy, the prepared negative pole piece is smooth and soft and has smooth surface, the film forming effect of the pole piece is improved, the rate capability of the lithium-supplementing negative pole is improved, the situation that the pre-lithium material has large particles and hard hardness, and the lithium is attached to the negative pole to form dendrite after being separated out, so that the surface is locally heightened and the diaphragm is punctured, a micro short circuit is formed, resulting in a problem of an abnormal charging curve. In addition, the method does not need inert gas for protection, adds the carbon-coated pre-lithium material in the mixing stage, has simple operation and easy industrialization, has the characteristics of high first efficiency and high capacity compared with a graphite cathode, and can be used for preparing a high-energy-density battery.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (10)

1.一种电池活性层的制备方法，其特征在于，所述电池活性层的制备方法包括：1. a preparation method of battery active layer, is characterized in that, the preparation method of described battery active layer comprises: 将活性材料和导电剂干法混合后，加入纤维化粘结剂并进行纤维化处理，干法工艺得到的混合物料进行辊压成膜后，形成所述的电池活性层；After dry mixing the active material and the conductive agent, adding a fibrous binder and performing fibrillation treatment, the mixture obtained by the dry process is rolled into a film to form the battery active layer; 所述活性材料中包括碳包覆的预锂材料。The active material includes a carbon-coated pre-lithium material. 2.根据权利要求1所述的电池活性层的制备方法，其特征在于，所述制备方法在干燥环境下进行；2. The preparation method of the battery active layer according to claim 1, wherein the preparation method is carried out in a dry environment; 优选地，所述活性材料和导电剂干法混合过程中还加入非纤维化粘结剂；Preferably, a non-fibrous binder is also added during the dry mixing process of the active material and the conductive agent; 优选地，所述非纤维化粘结剂包括聚偏氟乙烯、羧甲基纤维素或丁苯橡胶中的一种或至少两种的组合；Preferably, the non-fibrous binder comprises one or a combination of at least two of polyvinylidene fluoride, carboxymethyl cellulose or styrene-butadiene rubber; 优选地，所述非纤维化粘结剂的质量为混合物料的0～10％，进一步优选为0.5～5％；Preferably, the mass of the non-fibrous binder is 0-10% of the mixed material, more preferably 0.5-5%; 优选地，所述纤维化粘结剂包括聚四氟乙烯、聚酰亚胺、聚丙烯或聚乙烯中的一种或至少两种的组合；Preferably, the fiberizing binder comprises one or a combination of at least two of polytetrafluoroethylene, polyimide, polypropylene or polyethylene; 优选地，所述纤维化粘结剂的质量为混合物料的0.1～30％，进一步优选为0.5～10％；Preferably, the mass of the fiberizing binder is 0.1-30% of the mixed material, more preferably 0.5-10%; 优选地，所述纤维化处理包括研磨、球磨或脱泡中的一种或至少两种的组合，进一步优选为研磨，所述纤维化处理将纤维化粘结剂纤维化，并与活性材料和导电剂形成块状或片状结构的混合物料。Preferably, the fiberizing treatment comprises one or a combination of at least two of milling, ball milling or deaeration, further preferably milling, and the fiberizing treatment fibrillates the fibrillating binder and mixes it with the active material and The conductive agent forms a mixture of bulk or flake-like structures. 3.根据权利要求1或2所述的电池活性层的制备方法，其特征在于，所述预锂材料包括锂硅合金、硅或氧化亚硅中的一种或至少两种的组合，进一步优选为锂硅合金；3. The method for preparing a battery active layer according to claim 1 or 2, wherein the pre-lithium material comprises one or a combination of at least two of lithium-silicon alloy, silicon or silicon oxide, further preferably It is lithium silicon alloy; 优选地，所述活性材料中碳包覆的预锂材料的质量占比为0.1～60％，进一步优选为5～40％；Preferably, the mass proportion of the carbon-coated pre-lithium material in the active material is 0.1-60%, more preferably 5-40%; 优选地，所述碳包覆的预锂材料中包覆碳的质量含量为0.5～50％，进一步优选为1～10％；Preferably, the mass content of the coated carbon in the carbon-coated pre-lithium material is 0.5-50%, more preferably 1-10%; 优选地，所述锂硅合金中Li:Si的原子数量比为(0～4.4):1；Preferably, the atomic number ratio of Li:Si in the lithium-silicon alloy is (0-4.4):1; 优选地，所述锂硅合金包括Li4.4Si、Li3.25Si或Li1.71Si中的一种或至少两种的组合。Preferably, the lithium silicon alloy includes one or a combination of at least two of Li 4.4 Si, Li 3.25 Si or Li 1.71 Si. 4.根据权利要求1-3任一项所述的电池活性层的制备方法，其特征在于，所述活性材料为负极活性材料，所述负极活性材料中还包括石墨；4. The method for preparing a battery active layer according to any one of claims 1-3, wherein the active material is a negative electrode active material, and the negative electrode active material further comprises graphite; 优选地，所述负极活性材料中石墨的质量占比为40～95％。Preferably, the mass proportion of graphite in the negative electrode active material is 40-95%. 5.根据权利要求1-4任一项所述的电池活性层的制备方法，其特征在于，所述活性材料的质量为混合物料的25～99.9％，进一步优选为87.5～98.5％；5. The method for preparing a battery active layer according to any one of claims 1-4, wherein the mass of the active material is 25-99.9% of the mixture, more preferably 87.5-98.5%; 优选地，所述导电剂的质量为混合物料的0～5％，进一步优选为1～2.5％；Preferably, the mass of the conductive agent is 0-5% of the mixture, more preferably 1-2.5%; 优选地，所述导电剂包括乙炔黑、Super-P、碳纳米管、碳纤维、科琴黑、石墨导电剂、石墨烯、活性炭、多孔碳中的一种或至少两种的组合。Preferably, the conductive agent comprises one or a combination of at least two of acetylene black, Super-P, carbon nanotubes, carbon fibers, Ketjen black, graphite conductive agent, graphene, activated carbon, and porous carbon. 6.根据权利要求1-5任一项所述的电池活性层的制备方法，其特征在于，所述辊压的方式包括热辊压，所述混合物料辊压后形成电池活性层；6. The method for preparing a battery active layer according to any one of claims 1 to 5, wherein the rolling method comprises hot rolling, and the mixture material is rolled to form a battery active layer; 优选地，所述热辊压的温度为25～200℃，进一步优选为90～160℃。Preferably, the temperature of the hot rolling is 25-200°C, more preferably 90-160°C. 7.根据权利要求6所述的电池活性层的制备方法，其特征在于，所述制备方法具体包括以下步骤：7. The preparation method of the battery active layer according to claim 6, wherein the preparation method specifically comprises the following steps: (Ⅰ)在干燥环境下，将活性材料、导电剂和非纤维化粘结剂干法混合后，再加入纤维化粘结剂进行研磨纤维化处理，使纤维化粘结剂纤维化，并与活性材料和导电剂研磨形成块状或片状结构的混合物料，其中，活性材料中碳包覆的锂硅合金的质量占比为0.1～100％，碳包覆的锂硅合金中包覆碳的质量含量为1～10％，锂硅合金的Li:Si原子数量比为(0～4.4):1；非纤维化粘结剂的质量为混合物料的0.5～5％，纤维化粘结剂的质量为混合物料的0.5～10％，活性材料的质量为混合物料的87.5～98.5％，导电剂的质量为混合物料的1～2.5％；(I) In a dry environment, after dry mixing the active material, the conductive agent and the non-fibrous binder, add the fibrous binder for grinding and fibrillation treatment, so that the fibrous binder is fibrillated and mixed with The active material and the conductive agent are ground to form a mixed material with a block or sheet structure, wherein the mass ratio of the carbon-coated lithium-silicon alloy in the active material is 0.1-100%, and the carbon-coated lithium-silicon alloy is coated with carbon. The mass content of the lithium-silicon alloy is 1-10%, the Li:Si atomic number ratio of the lithium-silicon alloy is (0-4.4):1; the mass of the non-fibrous binder is 0.5-5% of the mixture, and the fibrous binder is The mass of the active material is 0.5-10% of the mixture, the mass of the active material is 87.5-98.5% of the mixture, and the mass of the conductive agent is 1-2.5% of the mixture; (Ⅱ)将混合物料在90～160℃下进行热辊压形成电池活性层。(II) The mixture is subjected to hot rolling at 90-160° C. to form a battery active layer. 8.一种电池极片，其特征在于，所述电池极片包括集流体以及位于集流体至少一侧表面的电池活性层，所述电池活性层采用权利要求1-7任一项所述的电池活性层的制备方法制备得到。8. A battery pole piece, characterized in that, the battery pole piece comprises a current collector and a battery active layer on at least one surface of the current collector, and the battery active layer adopts the method described in any one of claims 1-7. The method for preparing the battery active layer is prepared. 9.根据权利要求8所述的电池极片，其特征在于，所述电池极片的厚度为30～500μm。9 . The battery pole piece according to claim 8 , wherein the thickness of the battery pole piece is 30-500 μm. 10 . 10.一种固态电池，其特征在于，所述固态电池包括正极、负极和隔膜，所述负极采用权利要求9所述的电池极片。10 . A solid-state battery, characterized in that, the solid-state battery comprises a positive electrode, a negative electrode and a separator, and the negative electrode adopts the battery pole piece according to claim 9 .
CN202110921098.4A 2021-08-11 2021-08-11 Preparation method of battery active layer, battery pole piece and application Pending CN113659104A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110921098.4A CN113659104A (en) 2021-08-11 2021-08-11 Preparation method of battery active layer, battery pole piece and application

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110921098.4A CN113659104A (en) 2021-08-11 2021-08-11 Preparation method of battery active layer, battery pole piece and application

Publications (1)

Publication Number Publication Date
CN113659104A true CN113659104A (en) 2021-11-16

Family

ID=78480074

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110921098.4A Pending CN113659104A (en) 2021-08-11 2021-08-11 Preparation method of battery active layer, battery pole piece and application

Country Status (1)

Country Link
CN (1) CN113659104A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114122331A (en) * 2021-11-19 2022-03-01 蜂巢能源科技(无锡)有限公司 Modified silicon-based negative electrode plate and preparation method and application thereof
CN114335678A (en) * 2021-12-29 2022-04-12 蜂巢能源科技(无锡)有限公司 Battery and preparation method thereof
CN114784220A (en) * 2022-04-29 2022-07-22 三一技术装备有限公司 Dry method electrode preparation method
CN114843453A (en) * 2022-06-09 2022-08-02 江苏正力新能电池技术有限公司 Pole piece manufacturing method, pole piece and battery
CN115377424A (en) * 2022-08-22 2022-11-22 深圳市合壹新能技术有限公司 Dry electrode slice containing solid electrolyte and preparation method and application thereof
CN115832182A (en) * 2022-04-24 2023-03-21 宁德时代新能源科技股份有限公司 Positive plate and preparation method thereof, electrode assembly, battery monomer, battery and electric equipment
CN115954613A (en) * 2023-03-14 2023-04-11 宁德新能源科技有限公司 Solid electrolyte membrane, method for producing same, secondary battery, and electronic device
WO2023236598A1 (en) * 2022-06-06 2023-12-14 宁德时代新能源科技股份有限公司 Electrode sheet structure and preparation method therefor, battery cell, and secondary battery
CN117577788A (en) * 2024-01-15 2024-02-20 西北工业大学 Method for preparing high-load prelithiation negative electrode based on dry method
CN117894917A (en) * 2024-02-28 2024-04-16 蜂巢能源科技股份有限公司 Lithium supplementing negative electrode sheet, preparation method thereof and lithium ion battery
CN118588942A (en) * 2024-08-07 2024-09-03 远景动力技术(鄂尔多斯市)有限公司 All-solid-state dry-process positive electrode sheet and all-solid-state battery
WO2025015816A1 (en) * 2023-07-19 2025-01-23 惠州亿纬锂能股份有限公司 Method for preparing dry electrode, and dry electrode obtained therefrom and use thereof
CN119517990A (en) * 2025-01-21 2025-02-25 南通江海储能技术有限公司 A high-stability lithium battery pole piece and its preparation method and application
CN119517990B (en) * 2025-01-21 2025-04-11 南通江海储能技术有限公司 A high-stability lithium battery pole piece and its preparation method and application

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112038574A (en) * 2020-08-31 2020-12-04 蜂巢能源科技有限公司 A kind of pole piece film and its preparation method and use
CN112164797A (en) * 2020-09-24 2021-01-01 蜂巢能源科技有限公司 A kind of pre-lithium electrode film and its preparation method and use
CN112289976A (en) * 2020-10-28 2021-01-29 蜂巢能源科技有限公司 Positive electrode material layer, preparation method thereof, positive plate and battery
CN112701252A (en) * 2019-10-23 2021-04-23 南京鼎腾石墨烯研究院有限公司 Flexible battery pole piece, preparation method thereof and battery containing battery pole piece
CN113054155A (en) * 2021-04-27 2021-06-29 昆山宝创新能源科技有限公司 Preparation method of pole piece and lithium ion battery
CN113113560A (en) * 2021-04-08 2021-07-13 昆山宝创新能源科技有限公司 Pre-lithiation electrode, preparation method thereof and lithium ion battery
CN113178557A (en) * 2021-04-26 2021-07-27 昆山宝创新能源科技有限公司 Battery material, battery pole piece, preparation method of battery pole piece and battery

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112701252A (en) * 2019-10-23 2021-04-23 南京鼎腾石墨烯研究院有限公司 Flexible battery pole piece, preparation method thereof and battery containing battery pole piece
CN112038574A (en) * 2020-08-31 2020-12-04 蜂巢能源科技有限公司 A kind of pole piece film and its preparation method and use
CN112164797A (en) * 2020-09-24 2021-01-01 蜂巢能源科技有限公司 A kind of pre-lithium electrode film and its preparation method and use
CN112289976A (en) * 2020-10-28 2021-01-29 蜂巢能源科技有限公司 Positive electrode material layer, preparation method thereof, positive plate and battery
CN113113560A (en) * 2021-04-08 2021-07-13 昆山宝创新能源科技有限公司 Pre-lithiation electrode, preparation method thereof and lithium ion battery
CN113178557A (en) * 2021-04-26 2021-07-27 昆山宝创新能源科技有限公司 Battery material, battery pole piece, preparation method of battery pole piece and battery
CN113054155A (en) * 2021-04-27 2021-06-29 昆山宝创新能源科技有限公司 Preparation method of pole piece and lithium ion battery

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114122331A (en) * 2021-11-19 2022-03-01 蜂巢能源科技(无锡)有限公司 Modified silicon-based negative electrode plate and preparation method and application thereof
CN114335678B (en) * 2021-12-29 2023-11-21 蜂巢能源科技(无锡)有限公司 Battery and preparation method thereof
CN114335678A (en) * 2021-12-29 2022-04-12 蜂巢能源科技(无锡)有限公司 Battery and preparation method thereof
CN115832182A (en) * 2022-04-24 2023-03-21 宁德时代新能源科技股份有限公司 Positive plate and preparation method thereof, electrode assembly, battery monomer, battery and electric equipment
CN114784220A (en) * 2022-04-29 2022-07-22 三一技术装备有限公司 Dry method electrode preparation method
WO2023236598A1 (en) * 2022-06-06 2023-12-14 宁德时代新能源科技股份有限公司 Electrode sheet structure and preparation method therefor, battery cell, and secondary battery
CN114843453A (en) * 2022-06-09 2022-08-02 江苏正力新能电池技术有限公司 Pole piece manufacturing method, pole piece and battery
CN115377424A (en) * 2022-08-22 2022-11-22 深圳市合壹新能技术有限公司 Dry electrode slice containing solid electrolyte and preparation method and application thereof
CN115954613A (en) * 2023-03-14 2023-04-11 宁德新能源科技有限公司 Solid electrolyte membrane, method for producing same, secondary battery, and electronic device
WO2025015816A1 (en) * 2023-07-19 2025-01-23 惠州亿纬锂能股份有限公司 Method for preparing dry electrode, and dry electrode obtained therefrom and use thereof
CN117577788A (en) * 2024-01-15 2024-02-20 西北工业大学 Method for preparing high-load prelithiation negative electrode based on dry method
CN117894917A (en) * 2024-02-28 2024-04-16 蜂巢能源科技股份有限公司 Lithium supplementing negative electrode sheet, preparation method thereof and lithium ion battery
CN117894917B (en) * 2024-02-28 2024-08-23 蜂巢能源科技股份有限公司 A lithium-supplemented negative electrode sheet and preparation method thereof, and a lithium-ion battery
CN118588942A (en) * 2024-08-07 2024-09-03 远景动力技术(鄂尔多斯市)有限公司 All-solid-state dry-process positive electrode sheet and all-solid-state battery
CN119517990A (en) * 2025-01-21 2025-02-25 南通江海储能技术有限公司 A high-stability lithium battery pole piece and its preparation method and application
CN119517990B (en) * 2025-01-21 2025-04-11 南通江海储能技术有限公司 A high-stability lithium battery pole piece and its preparation method and application

Similar Documents

Publication Publication Date Title
CN113659104A (en) Preparation method of battery active layer, battery pole piece and application
CN110739485A (en) low-temperature lithium ion batteries
CN103078092B (en) A kind of method preparing silicon-carbon composite cathode material of lithium ion battery
CN112002883A (en) Silicon-based composite material for negative electrode active material, negative electrode plate and lithium ion battery
CN109103425A (en) Negative electrode material, cathode and the battery with the cathode
CN112164797A (en) A kind of pre-lithium electrode film and its preparation method and use
CN108963187A (en) Silicon-carbon cathode, preparation method, lithium ion battery and electric vehicle
TW202021179A (en) Cathode material of nano-silicon having multilayer-graphene as carrier and coated with silicon suboxide and with amorphous carbon layer and method for fabricating the same
CN113690427A (en) Method for preparing lithium-silicon alloy pole piece, lithium-silicon alloy pole piece and lithium battery
CN114865228B (en) Flame retardant, flame-retardant modified diaphragm, battery and preparation method of battery
CN112968254A (en) Diaphragm for lithium ion battery, preparation method of diaphragm and lithium ion battery
WO2024031867A1 (en) Nitrogen-doped graphene-coated silicon-carbon composite material, and preparation method therefor and use thereof
CN117199363B (en) Graphite negative electrode material, preparation method thereof and battery
CN110875476A (en) Negative electrode for lithium secondary battery, method for preparing same, and lithium secondary battery
CN116417658A (en) Secondary battery and application thereof
CN116387472A (en) Negative electrode slurry of sodium ion battery, negative electrode plate and sodium ion battery
CN115714177A (en) Silicon-carbon composite material and preparation method thereof
CN114744151A (en) A kind of negative pole piece containing binder PAA2, battery and preparation method
CN112582611A (en) Application of polyacid oxide NVO in positive electrode of lithium-sulfur battery
CN114937758B (en) Negative electrode active material, negative electrode sheet and battery containing the negative electrode active material
CN113471401B (en) A high-safety high-capacity lithium-ion electrode pole piece and its manufacturing method
CN116154105A (en) Micron silicon negative electrode, preparation method thereof and lithium ion battery
CN114142028A (en) Negative electrode material, negative electrode sheet and preparation method and application thereof
CN115513444B (en) Silicon @ carbon-graphite composite anode material, composite layer anode piece and secondary battery thereof
CN113666354A (en) Preparation method of silicon-carbon composite material, silicon negative electrode piece and battery

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination