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Multilayer film, current collector, electrode sheet and battery

A technology of multi-layer film and current collector, applied in the field of pole piece and battery, multi-layer film and current collector, can solve the problems of insufficient metal layer adhesion, achieve less burr, improve battery energy density, and good chemical resistance Effect

Pending Publication Date: 2020-07-31
TORAY ADVANCED MATERIALS RES LAB CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyphenylene sulfide also has the problem of insufficient adhesion to the metal layer.

Method used

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  • Multilayer film, current collector, electrode sheet and battery
  • Multilayer film, current collector, electrode sheet and battery
  • Multilayer film, current collector, electrode sheet and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0071] According to the composition shown in Table 1, use an evaporation machine (TEMD-500 type produced by Beijing Techno Technology Co., Ltd.), first perform plasma treatment on a certain surface of the insulating layer, the treatment conditions are air pressure 1Pa, oxygen flow rate 80sccm , a bias voltage of 800V, and a treatment time of 30s; and then conduct metal vapor deposition on the plasma treatment surface to reach the target thickness shown in Table 1. Then, the same plasma treatment and metal evaporation are performed on the other surface of the insulating layer to make a multilayer film. Various performance tests were carried out on the obtained samples, and the results are listed in Table 1.

[0072] Metal vapor deposition conditions are as follows:

[0073] Al evaporation: air pressure 3×10 -3 Pa, evaporation rate 0.4nm / s;

[0074] Cu evaporation: air pressure 3×10 -3 Pa, evaporation rate 0.5nm / s.

Embodiment 6、7

[0078] According to the composition shown in Table 3, a multilayer film was made with reference to the conditions of Example 1, and an equilateral triangle pattern was formed on the surface of the conductive layer by embossing, the edges of the equilateral triangle were formed by grooves with a depth of 20nm, The width of the groove is 15 microns, and the side length of the equilateral triangle is 10 mm. Various performance tests were carried out on the obtained samples, and the results are listed in Table 3.

[0079] As can be seen from the test data of each embodiment and comparative example, the peelability of the conductive layer of each embodiment is below 5%, and the multilayer film has the characteristics of good heat resistance and chemical resistance. In case of abnormal conditions such as collision or puncture, it is not easy to generate burrs.

[0080] Table 1

[0081]

[0082] Table 2

[0083]

[0084] Note: " / " indicates that the test is not performed Table...

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Abstract

The present invention provides a multilayer film, which comprises at least one insulating layer and at least one conductive layer, wherein the conductive layer has a peelable degree of 5% or less. Themultilayer film provided by the invention has good heat resistance and chemical resistance, has no burrs when being subjected to abnormal conditions such as extrusion, collision or puncture and the like, is light in weight, and can improve the energy density of a battery. The invention also provides a current collector, an electrode sheet and a battery containing the multilayer film.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a multilayer film, and a current collector, a pole piece and a battery containing the multilayer film. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their high energy density, high output power, long cycle life, and environmental friendliness. However, when lithium-ion batteries are subjected to abnormal conditions such as extrusion, collision or puncture, they are prone to fire and explosion, causing serious safety accidents. Therefore, the safety problems of lithium-ion batteries have largely limited the application and development of lithium-ion batteries. [0003] The main materials of lithium-ion batteries include: positive electrode, negative electrode, separator, and electrolyte. Wherein the positive electrode includes a positive electrode active material and a current collector carrying the positiv...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/13H01M10/0525
CPCH01M4/667H01M4/13H01M10/0525Y02E60/10
Inventor 桂宗彦刘洋郑淼荒井崇
Owner TORAY ADVANCED MATERIALS RES LAB CHINA
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