CN112436105A - Pre-lithiation negative pole piece and preparation method thereof - Google Patents
Pre-lithiation negative pole piece and preparation method thereof Download PDFInfo
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- CN112436105A CN112436105A CN201910786829.1A CN201910786829A CN112436105A CN 112436105 A CN112436105 A CN 112436105A CN 201910786829 A CN201910786829 A CN 201910786829A CN 112436105 A CN112436105 A CN 112436105A
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- Prior art keywords
- lithiation
- pole piece
- negative pole
- layer
- negative
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- 238000006138 lithiation reaction Methods 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 19
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 229910052802 copper Inorganic materials 0.000 claims abstract description 13
- 239000010949 copper Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000000853 adhesive Substances 0.000 claims abstract description 10
- 230000001070 adhesive effect Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000007773 negative electrode material Substances 0.000 claims abstract description 10
- 239000006258 conductive agent Substances 0.000 claims abstract description 9
- 239000007767 bonding agent Substances 0.000 claims abstract 4
- 239000011149 active material Substances 0.000 claims abstract 2
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 4
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 4
- 229920001690 polydopamine Polymers 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 16
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 16
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002210 silicon-based material Substances 0.000 description 2
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
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
- H01M4/13—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
- 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
- H01M4/133—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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a pre-lithiation negative pole piece and a preparation method thereof, wherein the negative pole piece comprises a negative pole material layer, a pre-lithiation layer and a copper current collector, the negative pole material comprises a negative pole active material, a conductive agent and a bonding agent, the pre-lithiation layer comprises a lithium source and the bonding agent, and the pre-lithiation layer is positioned between the positive pole material layer and the copper current collector; (2) and (3) mixing and dispersing the negative active material, the conductive agent and the adhesive uniformly, then coating the mixture on the surface of the pre-lithiation pole piece prepared in the step (1), and drying at high temperature to obtain the pre-lithiation negative pole piece. The negative pole piece prepared by the invention can compensate the lithium source lost by the SEI film formed by formation, the first coulombic efficiency of the lithium ion battery is improved, and the energy density of the lithium ion battery is improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a prelithiation negative electrode plate and a preparation method thereof.
Background
In recent years, in order to meet the requirements of rapid development of new energy automobiles, smart power grids, distributed energy storage and the like, development of lithium ion batteries with high energy density, high safety and long cycle life becomes a research hotspot in the current energy storage field. Conventional lithium ion batteries are composed of a transition metal oxide positive electrode and a graphite negative electrode. Active lithium ions in the anode material can be consumed by the SEI film formed by the graphite cathode in the first charge-discharge process, so that the first coulomb efficiency of the lithium ion battery is low, and the improvement of the energy density of the lithium ion battery is limited. And the silicon-based material for researching fire heat at the present stage has lower coulombic efficiency compared with graphite for the first time. Therefore, an effective method is needed to improve the first coulombic efficiency of the lithium ion battery and improve the energy density of the lithium ion battery so as to meet the requirement on the energy density at the present stage.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a prelithiation negative electrode plate and a preparation method thereof, aiming at improving the first coulombic efficiency of a lithium ion battery and improving the energy density of the lithium ion battery.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a prelithiation negative pole piece, prelithiation negative pole piece include negative material layer, prelithiation layer and copper current collector, the negative material include negative active material, conducting agent, binder, prelithiation layer include lithium source, binder, prelithiation layer be between positive material layer and copper current collector.
The negative active material is one or more of graphite and silicon materials.
The lithium source of the pre-lithiation layer is metallic lithium powder.
The adhesive of the pre-lithiation layer is one or more of polyacrylonitrile and polydopamine.
The preparation method of the pre-lithiation negative pole piece comprises the following steps:
step 1: adding metal lithium powder and an adhesive into a solvent, uniformly mixing, then coating the mixture on the surface of a copper current collector by spraying, drying the mixture by an oven, and then carrying out heat treatment to obtain a pre-lithiated pole piece;
step 2: and (3) mixing and dispersing the negative active material, the conductive agent and the adhesive uniformly, then coating the mixture on the surface of the pre-lithiation pole piece prepared in the step (1), and drying at high temperature to obtain the pre-lithiation negative pole piece.
The heat treatment temperature in the step 1 is 90-200 ℃.
A pre-lithiation negative pole piece is prepared by the preparation method of the pre-lithiation negative pole piece.
The invention has the beneficial effects that: the prepared negative pole piece comprises a pre-lithiation layer, and the adhesiveness between the pre-lithiation layer and a copper current collector and the adhesiveness between the pre-lithiation layer and a negative pole material layer can be effectively improved through heat treatment; meanwhile, the prelithiation layer contains metal lithium powder, so that a lithium source lost by formation of an SEI (solid electrolyte interface) film is compensated, the first coulombic efficiency of the lithium ion battery is improved, and the energy density of the lithium ion battery is improved; in addition, the preparation method is simple to operate and easy for large-scale production.
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:
step 1: adding metal lithium powder and polyacrylonitrile into a solvent according to the mass ratio of 3:1, uniformly mixing, then coating the mixture on the surface of a copper current collector by spraying, drying the mixture by using an oven, and then carrying out heat treatment at 120 ℃ to prepare a pre-lithiation pole piece;
step 2: and (3) mixing and dispersing the negative active material, the conductive agent and the adhesive uniformly according to the mass ratio of 95:1:4, then coating the mixture on the surface of the pre-lithiation pole piece prepared in the step (1), and drying at high temperature to obtain the pre-lithiation negative pole piece.
Example 2:
step 1: adding metal lithium powder and polyacrylonitrile into a solvent according to the mass ratio of 2:1, uniformly mixing, then coating the mixture on the surface of a copper current collector by spraying, drying the mixture by using an oven, and then carrying out heat treatment at 150 ℃ to prepare a pre-lithiation pole piece;
step 2: and (3) mixing and dispersing the negative active material, the conductive agent and the adhesive uniformly according to the mass ratio of 95:1:4, then coating the mixture on the surface of the pre-lithiation pole piece prepared in the step (1), and drying at high temperature to obtain the pre-lithiation negative pole piece.
Example 3:
step 1: adding metal lithium powder and polydopamine into a solvent according to the mass ratio of 2:1, uniformly mixing, then coating the mixture on the surface of a copper current collector by spraying, drying the mixture by an oven, and then carrying out heat treatment at 100 ℃ to obtain a pre-lithiated pole piece;
step 2: and (3) mixing and dispersing the negative active material, the conductive agent and the adhesive uniformly according to the mass ratio of 95:1:4, then coating the mixture on the surface of the pre-lithiation pole piece prepared in the step (1), and drying at high temperature to obtain the pre-lithiation negative pole piece.
Example 4:
step 1: adding metal lithium powder and polydopamine into a solvent according to the mass ratio of 2:1, uniformly mixing, then coating the mixture on the surface of a copper current collector by spraying, drying the mixture by an oven, and then carrying out heat treatment at 150 ℃ to obtain a pre-lithiated pole piece;
step 2: and (3) mixing and dispersing the negative active material, the conductive agent and the adhesive uniformly according to the mass ratio of 95:1:4, then coating the mixture on the surface of the pre-lithiation pole piece prepared in the step (1), and drying at high temperature to obtain the pre-lithiation negative pole piece.
According to the pre-lithiation negative pole piece and the preparation method thereof, the first coulombic efficiency of the lithium ion battery is effectively improved, and the energy density of the lithium ion battery is improved.
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 (6)
1. The pre-lithiation negative pole piece is characterized by comprising a negative pole material layer, a pre-lithiation layer and a copper current collector, wherein the negative pole material comprises a negative pole active material, a conductive agent and a bonding agent, the pre-lithiation layer comprises a lithium source and the bonding agent, and the pre-lithiation layer is positioned between the positive pole material layer and the copper current collector.
2. The prelithiated negative electrode tab of claim 1, wherein the negative active material is one or more of graphite and silicon.
3. The prelithiated negative electrode tab of claim 1, wherein the lithium source of the prelithiated layer is metallic lithium powder.
4. The prelithiation negative electrode tab of claim 1, wherein the binder of the prelithiation layer is one or more of polyacrylonitrile and polydopamine.
5. A method of making a prelithiated negative electrode tab as claimed in any one of claims 1 to 4, comprising the steps of:
step 1: adding metal lithium powder and an adhesive into a solvent, uniformly mixing, then coating the mixture on the surface of a copper current collector by spraying, drying the mixture by an oven, and then carrying out heat treatment to obtain a pre-lithiated pole piece;
step 2: and (3) mixing and dispersing the negative active material, the conductive agent and the adhesive uniformly, then coating the mixture on the surface of the pre-lithiation pole piece prepared in the step (1), and drying at high temperature to obtain the pre-lithiation negative pole piece.
6. The method for preparing the pre-lithiated negative electrode plate according to claim 5, wherein the heat treatment temperature in the step 1 is 90-200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910786829.1A CN112436105A (en) | 2019-08-24 | 2019-08-24 | Pre-lithiation negative pole piece and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910786829.1A CN112436105A (en) | 2019-08-24 | 2019-08-24 | Pre-lithiation negative pole piece and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112436105A true CN112436105A (en) | 2021-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910786829.1A Pending CN112436105A (en) | 2019-08-24 | 2019-08-24 | Pre-lithiation negative pole piece and preparation method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN112436105A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952036A (en) * | 2021-03-30 | 2021-06-11 | 合肥国轩高科动力能源有限公司 | Pre-lithiation negative plate, manufacturing process thereof and lithium ion battery |
| CN113725400A (en) * | 2021-08-25 | 2021-11-30 | 远景动力技术(江苏)有限公司 | Pre-lithiated silicon-carbon negative plate and preparation method and application thereof |
| CN115050927A (en) * | 2022-06-29 | 2022-09-13 | 齐鲁中科电工先进电磁驱动技术研究院 | Prelithiation method and prelithiation system |
| CN115101710A (en) * | 2022-05-10 | 2022-09-23 | 清华大学 | Pre-lithiated lithium ion battery electrode and preparation system, method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112952036A (en) * | 2021-03-30 | 2021-06-11 | 合肥国轩高科动力能源有限公司 | Pre-lithiation negative plate, manufacturing process thereof and lithium ion battery |
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| CN115101710A (en) * | 2022-05-10 | 2022-09-23 | 清华大学 | Pre-lithiated lithium ion battery electrode and preparation system, method and application thereof |
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Effective date of registration: 20221116 Address after: 523867 Building 9, Dasheng Industrial City, Second Industrial Zone, No. 1438, Provincial Road S358, Shangsha Community, Chang'an Town, Dongguan City, Guangdong Province Applicant after: Dongguan Grind Energy Co.,Ltd. Address before: 518105 4th floor, building A2, industrial park, 168 Honghu Road, Yanchuan, Songgang, Bao'an District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN GRAND POWERSOURCE Co.,Ltd. |
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Application publication date: 20210302 |