CN113497222A - Lithium ion battery anode slurry and anode piece - Google Patents
Lithium ion battery anode slurry and anode piece Download PDFInfo
- Publication number
- CN113497222A CN113497222A CN202010249503.8A CN202010249503A CN113497222A CN 113497222 A CN113497222 A CN 113497222A CN 202010249503 A CN202010249503 A CN 202010249503A CN 113497222 A CN113497222 A CN 113497222A
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- Prior art keywords
- positive electrode
- slurry
- anode
- ion battery
- lithium ion
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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
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
-
- 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
- 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
- H01M4/133—Electrodes based on 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on 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
- H01M4/36—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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- 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
Abstract
The invention discloses a lithium ion battery anode slurry and an anode piece, wherein the anode slurry consists of an anode active material, a conductive agent, an adhesive, an anode additive and an organic solvent, the anode piece is formed by coating and drying the anode slurry, the anode additive is porous carbon powder, and the conductive agent is a composite conductive agent of conductive graphite with a carbon nano tube and flake layered structure. The slurry and the pole piece prepared by the invention are beneficial to improving the liquid absorption rate of the pole piece, enhancing the conduction rate of lithium ions, reducing the internal resistance of the battery and improving the rate performance of the battery; meanwhile, the compaction and the surface density of the positive pole piece can be improved, the pole piece is prevented from being stuck on a roller and falling powder, the internal resistance of the battery is reduced, the energy density is improved, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery anode slurry and an anode piece.
Background
The lithium ion battery has the outstanding advantages of high energy density, environmental friendliness, no memory effect, long cycle life, small self-discharge, environmental protection and the like, and is widely applied to consumer products and new energy automobiles.
With the pursuit of energy density and the control of cost, the gram capacity of materials used by the battery is higher and higher, the pole piece surface density and the compacted density are also increased continuously, the high pole piece surface density can reduce the use amount of foils and diaphragms, the production cost is reduced to a certain extent, the high compacted density can reduce the thickness of the pole piece, and the method has certain help for improving the volume energy density, but the overhigh compacted density can reduce the liquid absorption rate of the pole piece, hinder the movement of lithium ions and increase the internal resistance of the battery, the overhigh surface density is easy to cause pole piece roll sticking and powder falling during rolling, the prepared battery is easy to cause internal short circuit, and the overhigh surface density also can increase the internal resistance. Therefore, it is necessary to prepare a pole piece with high compaction and high area density without affecting the performance of the battery, thereby improving the energy density and reducing the production cost.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a lithium ion battery positive electrode slurry and a positive electrode plate, and aims to improve the compaction and surface density of the positive electrode plate, prevent the electrode plate from sticking a roller and falling powder, reduce the internal resistance of the battery, improve the energy density and reduce the production cost.
In order to achieve the purpose, the technical scheme adopted by the invention is a lithium ion battery anode slurry and an anode plate, wherein the anode slurry consists of an anode active material, a conductive agent, an adhesive, an anode additive and an organic solvent, the anode plate is formed by coating and drying the anode slurry, and the anode slurry is prepared from the following dry powders in percentage by mass:
positive electrode active material: 90-97%;
conductive agent: 0.5-1.5%;
adhesive agent: 1.0-2.0%;
and (3) a positive electrode additive: 0.5 to 1.5 percent.
Preferably, the positive electrode slurry comprises the following dry powder in percentage by mass:
positive electrode active material: 93-97 percent;
conductive agent: 0.5-1.5%;
adhesive agent: 1.0-1.8%;
and (3) a positive electrode additive: 0.5 to 1.5 percent.
The positive active material is one or more of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate and lithium manganese oxide. Preferably, the positive active material is one or more of lithium cobaltate, lithium nickel cobalt manganese oxide and lithium manganese oxide.
The positive electrode additive is porous carbon powder, the aperture of the positive electrode additive is 30-100 nm, and the porosity of the positive electrode additive is 30-70%. Preferably, the positive electrode additive is porous carbon powder, the pore diameter of the porous carbon powder is 50-100 nm, and the porosity of the porous carbon powder is 40-70%.
The conductive agent is a composite conductive agent of carbon nano tubes and conductive graphite, and the conductive graphite is in a flake layered structure.
The adhesive is one or more of polyvinylidene fluoride, polyacrylic acid, polyacrylonitrile, polyimide and polyurethane. Preferably, the adhesive is one or more of polyvinylidene fluoride, polyacrylic acid and polyacrylonitrile.
The compacted density is 3.5-3.7 g/cc. Preferably, the compaction density is 3.55-3.65 g/cc.
The single-sided surface density of the positive pole piece is 210-250 g/m2. Preferably, the single-sided surface density of the positive pole piece is 220-240 g/m2。
The invention has the beneficial effects that: porous carbon powder is added into the prepared slurry and the pole piece, so that the liquid absorption rate of the pole piece is improved, the conduction rate of lithium ions is enhanced, the internal resistance of the battery is reduced, and the rate performance of the battery is improved; the conductive graphite with the flake layered structure can effectively improve the compaction density of the pole piece, and meanwhile, the porous carbon powder, the carbon nano tube and the conductive graphite have synergistic effect to form a point, line and surface conductive network, thereby reducing the internal resistance of the battery and improving the performance of the battery; in addition, the porous carbon powder and the conductive graphite are used simultaneously, so that the compaction and the surface density of the positive pole piece can be improved, the pole piece is prevented from being stuck on a roller and falling off powder, the internal resistance of the battery is reduced, the energy density is improved, and the production cost is reduced.
Detailed Description
The present invention is described in detail below with reference to specific embodiments, and the description in this section is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
Example 1:
97 parts of lithium nickel cobalt manganese oxide serving as an anode active material, 0.2 part of carbon nano tube and 0.8 part of conductive graphite serving as conductive agents, 1.2 parts of polyvinylidene fluoride serving as a bonding agent, 0.8 part of porous carbon powder serving as an anode additive and N-methyl-2-pyrrolidone serving as a solvent are uniformly mixed and dispersed, and the mixture is coated on the surface of an aluminum foil with the thickness of 12 mu m, and the density of the single-side surface of the aluminum foil is 220g/m2And drying and rolling according to the compaction density of 3.55g/cc to obtain the positive pole piece.
Example 2:
taking 96.5 parts of lithium nickel cobalt manganese oxide as an anode active material, 0.2 part of carbon nano tube and 0.8 part of conductive graphite as conductive agents, 1.5 parts of polyvinylidene fluoride as adhesives, 1.0 part of porous carbon powder as an anode additive, and N-methyl-2-pyrrolidone as a solvent, mixing and dispersing the materials uniformly, coating the materials on the surface of an aluminum foil with the thickness of 12 mu m, wherein the density of a single surface of the aluminum foil is 220g/m2And drying and rolling according to the compaction density of 3.55g/cc to obtain the positive pole piece.
Example 3:
taking 96.5 parts of lithium nickel cobalt manganese oxide as an anode active material, 0.3 part of carbon nano tube and 1.2 parts of conductive graphite as conductive agents, 1.2 parts of polyvinylidene fluoride as adhesives, 0.8 part of porous carbon powder as an anode additive, and N-methyl-2-pyrrolidone as a solvent, mixing and dispersing the materials uniformly, coating the materials on the surface of an aluminum foil with the thickness of 12 mu m, wherein the density of a single surface of the aluminum foil is 220g/m2And drying and rolling according to the compaction density of 3.55g/cc to obtain the positive pole piece.
Example 4:
taking 96.5 parts of lithium nickel cobalt manganese oxide as an anode active material, 0.3 part of carbon nano tube and 1.2 parts of conductive graphite as conductive agents, 1.2 parts of polyvinylidene fluoride as a bonding agent, 0.8 part of porous carbon powder as an anode additive and N-methyl-2-pyrrolidone as a solvent, and mixing, dispersing and uniformly dispersing the materialsUniformly coating the mixture on the surface of an aluminum foil with the thickness of 12 mu m, wherein the single-side surface density of the aluminum foil is 240g/m2And drying and rolling according to the compaction density of 3.55g/cc to obtain the positive pole piece.
Example 5:
taking 96.5 parts of lithium nickel cobalt manganese oxide as an anode active material, 0.3 part of carbon nano tube and 1.2 parts of conductive graphite as conductive agents, 1.2 parts of polyvinylidene fluoride as adhesives, 0.8 part of porous carbon powder as an anode additive, and N-methyl-2-pyrrolidone as a solvent, mixing and dispersing the materials uniformly, coating the materials on the surface of an aluminum foil with the thickness of 12 mu m, wherein the density of a single surface of the aluminum foil is 230g/m2And drying and rolling according to the compaction density of 3.6g/cc to obtain the positive pole piece.
Comparative example 1:
97 parts of lithium nickel cobalt manganese oxide serving as a positive electrode active material, 0.4 part of carbon nano tube and 1.2 parts of conductive graphite serving as conductive agents, 1.4 parts of polyvinylidene fluoride serving as a bonding agent, and N-methyl-2-pyrrolidone serving as a solvent are uniformly mixed and dispersed, and the mixture is coated on the surface of an aluminum foil with the thickness of 12 mu m, and the density of a single surface of the aluminum foil is 230g/m2And drying and rolling according to the compaction density of 3.6g/cc to obtain the positive pole piece.
The invention provides the positive pole slurry and the positive pole piece of the lithium ion battery, which effectively improve the compaction and the surface density of the positive pole piece, remarkably prevent the pole piece from being stuck on a roller and falling off powder, reduce the internal resistance of a battery cell, improve the energy density and reduce the production cost.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (7)
1. The positive electrode slurry and the positive electrode plate of the lithium ion battery are characterized in that the positive electrode slurry is prepared from a positive electrode
The positive pole piece is formed by coating and drying positive pole slurry, wherein the positive pole slurry comprises the following dry powders in percentage by mass:
positive electrode active material: 90-97%;
conductive agent: 0.5-1.5%;
adhesive agent: 1.0-2.0%;
and (3) a positive electrode additive: 0.5 to 1.5 percent.
2. The positive electrode slurry and the positive electrode plate of the lithium ion battery according to claim 1, wherein the positive active material is one or more of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate and lithium manganese oxide.
3. The positive electrode slurry and the positive electrode plate of the lithium ion battery according to claim 1, wherein the positive electrode additive is porous carbon powder, the pore diameter of the porous carbon powder is 30-100 nm, and the porosity of the porous carbon powder is 30-70%.
4. The lithium ion battery positive electrode slurry and the positive electrode plate according to claim 1, wherein the conductive agent is a composite conductive agent of carbon nanotubes and conductive graphite, and the conductive graphite has a flake layered structure.
5. The lithium ion battery positive electrode slurry and the positive electrode plate according to claim 1, wherein the binder is one or more of polyvinylidene fluoride, polyacrylic acid, polyacrylonitrile, polyimide and polyurethane.
6. The positive electrode slurry and the positive electrode plate for the lithium ion battery according to claim 1, wherein the compacted density is 3.5-3.7 g/cc.
7. The positive electrode slurry and the positive electrode plate of the lithium ion battery according to claim 1, wherein the density of the single surface of the positive electrode plate is 210-250 g/m2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010249503.8A CN113497222A (en) | 2020-04-01 | 2020-04-01 | Lithium ion battery anode slurry and anode piece |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010249503.8A CN113497222A (en) | 2020-04-01 | 2020-04-01 | Lithium ion battery anode slurry and anode piece |
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| CN113497222A true CN113497222A (en) | 2021-10-12 |
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| CN202010249503.8A Pending CN113497222A (en) | 2020-04-01 | 2020-04-01 | Lithium ion battery anode slurry and anode piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114614013A (en) * | 2022-03-21 | 2022-06-10 | 柳州鹏辉能源科技有限公司 | Lithium ion battery composite additive, positive electrode slurry, preparation method of positive electrode slurry, positive electrode plate and electric equipment |
| CN116130808A (en) * | 2023-02-09 | 2023-05-16 | 宁夏宝丰昱能科技有限公司 | Composite pole piece, preparation method thereof and secondary battery |
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2020
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| CN116130808A (en) * | 2023-02-09 | 2023-05-16 | 宁夏宝丰昱能科技有限公司 | Composite pole piece, preparation method thereof and secondary battery |
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