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Method for improving cohesiveness of lithium ion battery pole piece through ray irradiation and lithium ion battery pole piece

A technology of lithium-ion batteries and ray irradiation, applied in the direction of bonding methods, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve problems such as pole piece deformation, improve adhesion, avoid binder aging, and maintain The effect of structural stability

Pending Publication Date: 2022-05-13
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the binder system in a molten state, which can easily cause severe deformation of the pole piece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The present embodiment provides a method of radiorradiation to improve the adhesion of lithium ion battery pole plates, the method comprising using a polyvinylidene difluoroethylene (PVDF) binder lithium iron phosphate pole sheet in turn microwave heating and radiation irradiation, specifically the use of PVDF binder lithium iron phosphate pole sheet at a speed of 20m / min from the microwave heating box through, microwave heating box microwave frequency of 10GHz, microwave heating box heating power of 1kW, In the process of microwave heating of lithium iron phosphate electrode tablets using PVDF binder, the temperature of lithium iron phosphate pole tablets using PVDF binders is controlled at 100±5 °C, and the water content of the pole sheets is reduced from 800ppm to 300ppm after heating.

[0035] After microwave treatment, the lithium iron phosphate electrode sheet using PVDF binder was placed into a closed γ radiation box, and the irradiation time was 3h, the absorption...

Embodiment 2

[0037]The present embodiment provides a method of radiorradiation to improve the adhesion of the lithium-ion battery electrodes, the method comprising using sodium carboxymethyl cellulose and styrene - butadiene copolymer adhesive (CMC / SBR) binder of the graphite pole pieces in turn microwave heating and radiation irradiation, specifically the graphite pole piece using CMC / SBR binder at a speed of 30m / min through the microwave heating box, the microwave frequency of the microwave heating box is 5GHz, the heating power of the microwave heating box is 500W, In the process of microwave irradiation of graphite poles using CMC / SBR binder, the temperature of graphite poles using CMC / SBR binders is controlled at 80±5 °C, and the polar small molecules of N-methylpyrrolidone (NMP) are quickly removed, and after heating, the water content of the polar plates is reduced from 400ppm to 200ppm, and there is no residue of NMP.

[0038] The graphite pole pieces using CMC / SBR binder after ...

Embodiment 3

[0040] The present embodiment provides a method of radio irradiation to improve the adhesion of the lithium-ion battery electrode plates, the method comprising microwave heating and radiation irradiation of the silicon carbon pole plates using polyacrylic acid (PAA) binder in turn, specifically the silicon carbon pole piece using the PAA binder at a speed of 50m / min from the microwave heating box through, the microwave frequency of the microwave heating box is 10GHz, the heating power of the microwave heating box is 5kW, and the active material on both sides of the silicon carbon electrode using paA binder is microwave heating, In the process, the temperature of the silicon carbon pole piece using PAA binder is controlled at 90±5 °C, the water removal is quickly removed, and after heating, the water content of the pole piece is reduced from 900 ppm to 350 ppm.

[0041] After microwave treatment, the silicon carbon pole piece using PAA binder was placed into a closed γ radiation ...

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Abstract

The invention belongs to the technical field of lithium ion battery manufacturing, and discloses a method for improving the cohesiveness of a lithium ion battery pole piece through ray irradiation and the lithium ion battery pole piece. The method comprises the step of sequentially carrying out microwave heating and ray irradiation on the lithium ion battery pole piece using the binder. According to the method, polar small molecules including water in the lithium ion battery pole piece are rapidly removed through microwave irradiation, and the problem of binder aging caused by baking in a high-temperature oven is solved. The cross-linking binder is irradiated by rays, so that the problem that a battery system is polluted by residual cracking products of a chemical cross-linking agent is avoided, and the problem that the dimensional stability of the lithium ion battery pole piece is damaged by chemical cross-linking carried out under a heating condition is avoided. The method disclosed by the invention has important significance in prolonging the service life of the battery and reducing the use cost of the battery in the whole life cycle.

Description

Technical field [0001] The present invention belongs to the field of lithium-ion battery manufacturing technology, specifically, relates to a method of radiorradiation to improve the adhesion of lithium-ion battery pole plates and lithium-ion battery pole plates. Background [0002] As a medium for bonding active materials and conductive agents to the collector, the binder in lithium-ion batteries plays an important role in maintaining the integrity of the pole plate structure and thus maintaining the electrochemical properties of lithium-ion batteries. In the process of battery manufacturing, in order to remove the moisture in the pole pieces, the method of baking the pole pieces at a high temperature for a long time caused the adhesive to accelerate aging. During the use of the battery, the swelling effect of the electrolyte on the binder will reduce the adhesion of the binder, destroy the integrity of the polar plates, and then affect the performance of the battery. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/13C09J5/00H01M4/04H01M10/0525
CPCH01M4/139H01M4/13H01M4/0471H01M10/0525C09J5/00
Inventor 李光珠周宾孙小嫚杨道均
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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