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Lithium ion battery electrode slice, preparation method thereof and purpose thereof

A lithium-ion battery and electrode sheet technology, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., to achieve good processing performance and liquid retention performance, improvement of magnification and low temperature performance, and equipment compatibility

Inactive Publication Date: 2013-04-24
HYB BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] CN101265397 discloses a binder for the positive and negative electrodes of lithium ion batteries, which is composed of at least two polyvinylidene fluorides with different molecular weights in the range of 10,000-1,500,000, and the ratio range is 1:10-10 : 1, to improve the processing performance of positive and negative electrode slurries, improve the situation that the viscosity of existing binders is difficult to control in the slurry preparation process, improve the bonding performance of positive and negative electrode sheets, and can improve the electric capacity of lithium-ion batteries chemical properties

Method used

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  • Lithium ion battery electrode slice, preparation method thereof and purpose thereof
  • Lithium ion battery electrode slice, preparation method thereof and purpose thereof
  • Lithium ion battery electrode slice, preparation method thereof and purpose thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A method for preparing a positive electrode sheet of a lithium-ion battery, comprising the following steps: (1) First, adding solvent NMP into a container, starting to stir, adding binder II until dissolved, and then adding maleic anhydride grafted polyvinylidene fluoride to it The mass of ethylene, binder II and maleic anhydride grafted polyvinylidene fluoride is 4:1, the mass percentage of binder II and maleic anhydride grafted polyvinylidene fluoride is 1.5wt%, stirring and dissolving, Be made into the binder mother liquor that solid content is 8%; (2) in step (1), add 2wt% acetylene black conductive agent and 96.5wt% lithium cobalt oxide cathode active material, it is made into solid content 79wt% slurry, the viscosity of the slurry is 9600mPa·S, and then coated and dried to prepare a lithium-ion battery cathode sheet, and then assembled into a lithium-ion battery. After 300 cycles at 0.5C, the capacity retention rate is greater than 85%, such as image 3 shown. I...

Embodiment 2

[0047] In Example 1, when preparing the binder mother liquor, the specific parameters are that the solid content of the binder mother liquor is 10%, and the mass ratio of maleic anhydride-grafted polyvinylidene fluoride to binder II is 1:4. The slurry produced is very stable, the positive electrode sheet does not drop powder, and the single and double sides of the positive electrode sheet have great adhesion.

Embodiment 3

[0049] In Example 1, when preparing the binder mother liquor, the specific parameters are: the solid content of the binder mother liquor is 8%, the mass ratio of maleic anhydride grafted polyvinylidene fluoride to binder II is 1:2, The prepared slurry is very stable, the positive electrode sheet does not drop powder, and the single and double sides of the positive electrode sheet have great adhesion.

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Abstract

The invention discloses a lithium ion battery electrode slice which comprises binder I. The binder I is made from any one of or a mixture of at least two of maleic anhydride grafted polyvinylidene fluoride, polymethyl methacrylate and polyethylene oxide. The electrode slice can be a positive electrode slice or a negative electrode slice. The invention further discloses a preparation method of the positive electrode slice. The preparation method includes the following steps: (1), binder II is added into dissolvent, and mixed to be dissolved in the dissolvent, and then the binder I is added into the dissolvent to prepare and obtain binder mother solution; (2), conductive agent and positive electrode active material are added into the binder mother solution to prepare and obtain sizing agent, and then coating and drying are performed to prepare and obtain the lithium ion battery positive electrode slice. The preparation process is simple, the production efficiency is high, the lithium ion battery positive electrode slice is compatible with existing equipment for battery preparation, industrial and large batch production can be achieved, and the prepared lithium ion battery positive electrode slice is good in machinability and liquid retainability.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to an electrode sheet of a lithium ion battery, a preparation method and an application thereof. The electrode sheet belongs to an oily electrode sheet. Background technique [0002] As the global energy crisis and environmental pollution seriously threaten the sustainable development of human beings, the new energy industry, as one of the top ten high-tech industries in the 21st century, has received extensive attention. The battery industry is an important part of the new energy industry and has become a hot spot in the global economic development. Lithium-ion batteries are considered to be the preferred energy storage devices due to their high specific energy and long cycle life. With technological breakthroughs in key materials of lithium-ion batteries, the application range of lithium-ion batteries has been continuously expanded, and its application fields have expanded fr...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M4/139
CPCY02E60/122Y02E60/10
Inventor 傅昭冯洪亮冯岸柏井明召胡清平蒋小华
Owner HYB BATTERY
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