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Preparation method for lithium ion battery pole piece and lithium ion battery pole piece

A technology of lithium ion battery and pole piece, applied in the field of lithium ion battery pole piece and its preparation, can solve the problems such as the need to improve the bonding effect and the complex composition of the conductive coating, so as to improve the electrochemical performance and overcome the problems of falling off current collectors. Effect

Inactive Publication Date: 2020-02-18
创普斯(深圳)新能源科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design conductive coating composition of this application is complex, and the bonding effect needs to be improved

Method used

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  • Preparation method for lithium ion battery pole piece and lithium ion battery pole piece
  • Preparation method for lithium ion battery pole piece and lithium ion battery pole piece
  • Preparation method for lithium ion battery pole piece and lithium ion battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) The preparation concentration is 2mg mL -1 Graphite oxide solution, and coated on common copper foil by spraying, the coating thickness is designed to be 1μm.

[0028] (2) Homogenize 420mAh / g silicon carbon material, SP, CNT, CMC, and SBR according to the mass ratio of 94:1:0.5:2.5:3, and coat it on copper foil to make silicon carbon negative electrode The pole piece, the thickness of the pole piece is 100 μm.

[0029] (3) Test the peel strength of the pole piece.

Embodiment 2

[0034] (1) The preparation concentration is 1.5mg mL -1 Graphite oxide solution, and coated on carbon-coated copper foil by flow coating, the coating thickness is designed to be 3 μm.

[0035] (2) Homogenize 600mAh / g silicon carbon material, SP, VGCF, CMC, and SBR according to the mass ratio of 94:1:0.5:2.5:3, and coat it on copper foil to make silicon carbon negative electrode The pole piece, the thickness of the pole piece is 150 μm.

[0036] (3) Assemble the silicon-carbon negative pole piece with the diaphragm and the lithium plate respectively to form a buckle test battery for testing, perform CC charge and discharge on the example at 0.2C, and record relevant performance tests. (See figure 2 the upper line in

Embodiment 3

[0041] (1) The preparation concentration is 1mg mL -1 The graphite oxide solution was sprayed on the porous copper foil by spraying, and the coating thickness was designed to be 2 μm.

[0042] (2) Homogenize 450mAh / g silicon carbon material, SP, CNT, CMC, and SBR according to the mass ratio of 96:1:0.5:1.5:1, and coat it on copper foil to make silicon carbon negative electrode The pole piece, the thickness of the pole piece is 200 μm.

[0043] (3) Assemble the silicon carbon negative pole piece with the diaphragm and the positive pole piece into a battery cell by winding, and then complete the corresponding lithium-ion battery assembly through liquid injection, packaging, standing, formation, aging and other processes.

[0044] (4) Under the environment of 35°C, charge and discharge the example at 1C, constant current constant voltage charging voltage to 4.2V, constant current discharge voltage to 2.75V, record the relevant test performance and take out the electrode sheet af...

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Abstract

The invention discloses a lithium ion battery pole piece and a preparation method thereof. Particularly, a graphene oxide (GO) coating is applied to the surface of a current collector, an oxygen-containing functional group material is added to lithium ion battery slurry, the prepared slurry is applied to the current collector containing the GO coating, and preparation of the pole piece is completed. Through the Pi-Pi combination effect between the GO coating and the oxygen-containing functional group material pole piece, the interface between the pole piece material layer and the current collector layer is modified, so that the bonding effect between the material layer and the current collector is promoted, the problem that the pole piece material falls off from the current collector in the charging and discharging process is effectively solved, and the electrochemical performance of the lithium ion battery is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery pole piece and a preparation method thereof. Background technique [0002] Lithium-ion batteries mainly rely on the intercalation or deintercalation of lithium ions in the positive or negative electrode materials to work. It mainly relies on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li+ intercalates and deintercalates back and forth between the two electrodes: when charging, Li+ is deintercalated from the positive electrode, intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. As the charge-discharge cycle proceeds, the active material will expand / shrink, and the contact between the electrode material layer and the current collector interface will be loose, caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M10/0525H01M4/66H01M4/1393H01M4/133
CPCH01M4/0404H01M4/133H01M4/1393H01M4/667H01M10/0525Y02E60/10
Inventor 周敏苑克国付光辉赵越
Owner 创普斯(深圳)新能源科技集团有限公司
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