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Preparation method for three-dimensional porous lithium ion battery negative electrode sheet

A lithium-ion battery, three-dimensional porous technology, used in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problem of poor adhesion of active materials, poor three-dimensionality of porous foils, and foil winding Easy to loosen and other problems, to solve the difficulty of preparation, efficient and fast production, and improve the effect of adhesion

Inactive Publication Date: 2018-11-23
新疆中亚新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-dimensionality of the pole pieces of lithium-ion batteries is mainly reflected in the foil, which is usually punched or corroded, but the three-dimensionality of the porous foil is not good, and the adhesion to the active material is not strong
If the foil is directly pressed into a three-dimensional shape before coating, the foil will be easily loosened and the winding length will not be enough, making mass production difficult

Method used

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  • Preparation method for three-dimensional porous lithium ion battery negative electrode sheet
  • Preparation method for three-dimensional porous lithium ion battery negative electrode sheet
  • Preparation method for three-dimensional porous lithium ion battery negative electrode sheet

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] 8-micron porous double-sided smooth copper foil is used, with a pore size of 100 microns, a porosity of 17%, and a copper foil speed of 4m / min.

[0020] 1) Three-dimensional roughening process parameters: keep copper ion concentration at 17g / L, sulfuric acid concentration at 100g / L, solution temperature at 18-22°C, solution flow rate at 1m 3 / h, the current density is maintained at 90A / dm 2 .

[0021] 2) Washing process parameters: 10 nozzles are used, the water supply pressure of the nozzles is 2kgf, the flow rate is 5L / H, and the water temperature is kept at 20°C-30°C.

[0022] 3) Passivation process parameters: phosphoric acid content 0.65g / L, chromium trioxide 0.8g / L, zinc sulfate content 1.3g / L, current density maintained at 20A / dm 2 , the flow rate of passivation solution is 2 m 3 / h, temperature 20-22°C. 10 nozzles are used for water washing, the water supply pressure of the nozzles is 2kgf, the flow rate is 5L / H, and the water temperature is kept at 20°C-30°...

example 2

[0025] 9 micron porous double-sided smooth copper foil is used, with a pore size of 95 microns, a porosity of 20%, and a copper foil speed of 6m / min.

[0026] 1) Three-dimensional coarsening process parameters: the copper ion concentration is kept at 19g / L, the sulfuric acid concentration is kept at 100g / L, the solution temperature is kept at 18-22°C, and the solution flow rate is kept at 2m 3 / h, the current density is maintained at 100A / dm 2 .

[0027] 2) Washing process parameters: 12 nozzles are used, the water supply pressure of the nozzles is 2.5kgf, the flow rate is 3L / H, and the water temperature is kept at 20°C-30°C.

[0028] 3) Passivation process parameters: phosphoric acid content 0.7g / L, chromium trioxide 0.9g / L, zinc sulfate content 1.6g / L, current density maintained at 25A / dm 2 , the flow rate of passivation solution is 2 m 3 / h, temperature 20-22°C. 12 nozzles are used for water washing, the water supply pressure of each nozzle is 2.5kgf, the flow rate is 3...

example 3

[0031] 12 micron porous double-sided smooth copper foil is used, with a pore size of 95 microns, a porosity of 25%, and a copper foil speed of 8m / min.

[0032] 1) Three-dimensional roughening process parameters: keep copper ion concentration at 20g / L, sulfuric acid concentration at 105g / L, solution temperature at 20-25°C, solution flow rate at 2m 3 / h, the current density is maintained at 120A / dm 2 .

[0033] 2) Washing process parameters: 14 nozzles are used, the water supply pressure of the nozzles is 3kgf, the flow rate is 2L / H, and the water temperature is kept at 20°C-30°C.

[0034] 3) Passivation process parameters: phosphoric acid content 0.7g / L, chromium trioxide 1.1g / L, zinc sulfate content 2g / L, current density maintained at 30A / dm 2 , the flow rate of passivation solution is 2 m3 / h, temperature 20-22°C. Washing process parameters: 14 nozzles are used, the water supply pressure of the nozzles is 3kgf, the flow rate is 2L / H, and the water temperature is kept at 20...

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Abstract

The invention discloses a preparation method for a three-dimensional porous lithium ion battery negative electrode sheet. The preparation method is used for producing the three-dimensional porous lithium battery negative electrode sheet. A negative electrode sheet roll material is prepared by a porous copper foil roughening process, a water washing process, a three-dimensional porous copper foil surface passivation process and a coating process. According to the preparation method, before a porous copper foil is subjected to unwinding and coating, a three-dimensional roughening groove is firstdesigned on the surface of the copper foil, and the surface of the copper foil is subjected to three-dimensionally shaped small particle nodulation to increase the specific surface area of the surface of the copper foil and increase the contact area with an active material, the mechanical adhesion is improved, and meanwhile, the roughness of the copper foil is basically maintained unchanged. In the three-dimensional roughening process, the porous characteristic of the copper foil continues to be maintained. After further passivation, the surface of the copper foil is directly squeezed for drying by a squeeze roller but not dried, the copper foil is directly subjected to the slurry coating process, and after the coating is completed, the copper foil enters into the drying and winding process. The preparation method effectively solves the preparation difficulty problem of the three-dimensional porous lithium ion battery negative electrode sheet, improves the adhesion, integrates the foil material three-dimensional stresses and the negative electrode sheet preparation, can efficiently and quickly produces the negative electrode sheet, and saves energy and reduces consumption.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacturing, in particular to a preparation method of a three-dimensional porous lithium ion battery negative plate. Background technique [0002] With the popularization of lithium-ion batteries, their application range is becoming wider and wider, and the requirements for batteries are getting higher and higher. Especially for new energy vehicles, power lithium-ion batteries require better safety performance, higher battery capacity, and longer cycle life. . At present, various lithium-ion battery manufacturers continue to research and develop in response to the above requirements, or increase the energy density of the battery by more effectively utilizing the effective space of the battery, or fully utilize the electrochemical activity of the active material of the battery to improve its effective utilization. It can well meet many requirements of new energy vehicle batteries. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/80H01M10/0525
CPCH01M4/139H01M4/80H01M10/0525Y02E60/10
Inventor 袁智斌赖见李董轩李青海刘进
Owner 新疆中亚新材料科技有限公司
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