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Lithium ion battery with high safety performance

A lithium-ion battery, safety performance technology, applied in the direction of batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of thermal melting of composite conductive agents, loss of conductivity, increase in resistance of active materials, etc.

Inactive Publication Date: 2015-02-04
DONGGUAN LIWINON ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, people add a composite conductive agent to the electrode active material, so that when the battery is abused, the composite conductive agent is heated and melted, and the electrical conductivity is lost, resulting in an increase in the resistance of the active material.

Method used

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  • Lithium ion battery with high safety performance
  • Lithium ion battery with high safety performance
  • Lithium ion battery with high safety performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Reference attached Figure 1-2 , a lithium-ion battery with high safety performance, the preparation method of which is to prepare the positive electrode sheet: coating a slurry composed of positive electrode material active material, binder PVDF and conductive carbon black on the positive electrode current collector 10 to form a positive electrode coating Area 11, when coating, a circle of positive electrode blank area 12 is reserved at the tail of the positive electrode current collector 10, and then a ceramic coating 13 is coated on the end of the positive electrode coating area 11, and the ceramic coating 13 includes Al 2 o 3 and ZrO 2 , the thickness is 1 micron, the coating length is one circle, and then the positive pole piece is made into the positive pole piece through 4 processes of rolling, slitting, welding the positive tab 30 and pasting the adhesive paper;

[0026] Negative electrode sheet preparation: coating a slurry composed of negative electrode acti...

Embodiment 2

[0029] Reference attached Figure 1-2 , a lithium-ion battery with high safety performance, the preparation method of which is to prepare the positive electrode sheet: coating a slurry composed of positive electrode material active material, binder PVDF and conductive carbon black on the positive electrode current collector 10 to form a positive electrode coating Area 11, when coating, a circle of positive electrode blank area 12 is reserved at the tail of the positive electrode current collector 10, and then a ceramic coating 13 is coated on the end of the positive electrode coating area 11, and the ceramic coating 13 includes Al 2 o 3 and ZrO 2 , the thickness is 3 microns, the coating length is one circle, and then the positive pole piece is made into the positive pole piece through 4 processes of rolling, stripping, welding the positive tab 30 and pasting the adhesive paper;

[0030] Negative electrode sheet preparation: coating a slurry composed of negative electrode ac...

Embodiment 3

[0033] The difference from Example 2 is that the ceramic coating 13 includes Al 2 o 3 , ZrO 2 and a small amount of SiO 2 , the thickness is 1 micron, the others are the same as in Embodiment 2, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and specifically relates to a lithium ion battery with high safety performance. The lithium ion battery comprises a package shell, a positive sheet, a negative sheet and an electrolyte which are arranged in the package shell, as well as a separator film spaced between the positive and negative sheets, wherein the positive sheet comprises a positive electrode current collector and a positive electrode coated region; the positive electrode coated region is a positive electrode active material layer painted on the positive electrode current collector; the negative sheet comprises a negative electrode current collector and a negative electrode coated region; the negative electrode coated region is a negative electrode active material layer painted on the negative electrode current collector; the positive electrode current collector is provided with a positive electrode blank area; the tail end of the positive electrode coated region is coated with a ceramic coating. When the battery is abused, the potential safety hazard caused by a large amount of energy produced by direct short circuit of the positive and negative sheets within the battery is avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery with high safety performance. Background technique [0002] Lithium-ion batteries have been widely used in notebook computers, mobile communications, etc. due to their advantages such as high specific energy and high voltage. However, lithium-ion batteries have always hidden safety problems, and this problem is also the focus of attention of professionals in the industry. Although lithium-ion batteries have greatly improved safety performance compared with metal lithium secondary batteries, in practice There are still many hidden dangers in the application. Therefore, the safety issue is the main problem restricting the large-scale commercialization of high-capacity and power lithium-ion batteries. [0003] At present, people add a composite conductive agent to the electrode active material, so that when the battery is abused, the composite c...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M4/13H01M4/64H01M4/66
CPCH01M4/13H01M4/64H01M4/664H01M10/058H01M2220/30Y02E60/10Y02P70/50
Inventor 戈志敏于紫阳周天祥
Owner DONGGUAN LIWINON ENERGY TECH