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Composite diaphragm, preparation method thereof and lithium ion battery

A composite diaphragm and deionized water technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of easy soft deformation of batteries, poor adhesion, and affecting battery cycle performance rate performance, etc., to achieve Facilitate continuous production, low cost, and ensure long-term stability

Active Publication Date: 2020-06-05
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polyolefin separator modified by ceramic coating has greatly improved the temperature resistance and electrolyte wettability, but with the further improvement of the specific energy of lithium-ion batteries, customers put forward higher requirements for the high temperature resistance of the ceramic separator. Require
In addition, the adhesion between the ceramic coating and the battery pole piece is not good, which will affect the cycle performance and rate performance of the battery, and the battery is easy to soften and deform

Method used

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  • Composite diaphragm, preparation method thereof and lithium ion battery
  • Composite diaphragm, preparation method thereof and lithium ion battery
  • Composite diaphragm, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of composite diaphragm:

[0042] (a) Preparation of high-temperature resistant ceramic slurry: Add 35 parts of alumina and 0.46 parts of polyvinylpyrrolidone to 61.06 parts of deionized water, stir for 0.5 h, and then grind for 1 h to obtain a uniform ceramic dispersion, and then add 0.61 parts of sodium alginate , 2.84 parts of methacrylic acid-methyl methacrylate-vinyl carbazole terpolymer, 0.03 parts of sodium dodecylsulfonate were added to the ceramic dispersion, stirred at low speed, and dispersed for 2 hours to obtain a water-based high-temperature resistant ceramic slurry ;

[0043] (b) Preparation of water-based adhesive layer slurry: 10 parts of polymethylmethacrylate-polystyrene core-shell polymer particles, 0.05 parts of sodium alginate, 2.94 parts of polyvinyl alcohol, 0.01 parts of polyvinyl alcohol were added to 88 parts of water Polyether emulsified silicone oil defoamer, mixed and stirred for 60 minutes to obtain a water-based adhesive coati...

Embodiment 2

[0049] Different from Example 1, the preparation of composite diaphragm:

[0050] (a) Preparation of high-temperature resistant ceramic slurry: Add 40 parts of alumina and 0.51 parts of polyvinylpyrrolidone to 55.64 parts of deionized water, stir for 0.5 hours, and then grind for 1 hour to obtain a uniform ceramic dispersion, and then add 0.55 parts of carboxymethyl Sodium cellulose, 3.26 parts of methacrylic acid-methyl methacrylate-maleic anhydride terpolymer, and 0.04 parts of sodium dodecylsulfonate were added to the ceramic dispersion, stirred at a low speed, and dispersed for 1.5 hours to obtain a water-based high-temperature resistant Ceramic slurry;

[0051] (b) Preparation of water-based adhesive layer slurry: 15 parts of polymethylmethacrylate-polyvinylpiperidine core-shell polymer particles, 0.03 part of sodium carboxymethylcellulose, 1.96 parts of polyethylene were added to 83 parts of water Alcohol, 0.01 part of polyether emulsified silicone oil defoamer, mixed a...

Embodiment 3

[0055] Different from Example 1, the preparation of composite diaphragm:

[0056] (a) Preparation of high-temperature resistant ceramic slurry: Add 45 parts of alumina and 0.42 parts of polyvinylpyrrolidone to 50.75 parts of deionized water, stir for 0.5 hours, and then grind for 1 hour to obtain a uniform ceramic dispersion, and then add 0.48 parts of carboxymethyl Sodium cellulose, 3.53 parts of polyimide derivatives, and 0.05 parts of sodium dodecylsulfonate were added to the ceramic dispersion, stirred at a low speed, and dispersed for 1.5 hours to obtain a water-based high-temperature resistant ceramic slurry;

[0057] (b) Preparation of water-based adhesive layer slurry: 20 parts of polymethylmethacrylate-polystyrene core-shell polymer particles, 0.02 part of sodium carboxymethylcellulose, 1.57 parts of polyvinyl alcohol were added to 78.4 parts of water, 0.01 part of polyether emulsified silicone oil defoamer, mixed and stirred for 60 minutes to obtain a water-based adh...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a composite diaphragm which comprises a base membrane subjected to corona treatment, a high-temperature-resistantceramic coating is arranged on one surface of the base membrane, and water-based bonding layers are arranged on the other surface of the base membrane and the surface of the high-temperature-resistant ceramic coating; and the high-temperature-resistant ceramic coating comprises a ceramic material, a high-temperature-resistant binder, a dispersing agent, a thickening agent, a wetting agent and deionized water. In addition, the invention also provides a preparation method of the composite diaphragm and a lithium ion battery containing the composite diaphragm. Compared with the prior art, the composite diaphragm has the advantage that the cycle performance and the safety performance of the lithium ion battery can be improved on the premise of ensuring the air permeability.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a composite diaphragm, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high energy density, long cycle life, small self-discharge, no memory effect, and environmental friendliness. At present, they have become the most ideal mobile energy storage for communication, electric tools, electric vehicles, aerospace and other equipment Power supply has broad application prospects. [0003] Lithium-ion batteries usually form a bare cell by winding or laminating positive electrode sheets, negative electrode sheets, and separators, and then complete the entire production through processes such as packaging, liquid injection, and chemical formation. Among them, the separator is arranged between the positive electrode sheet and the negative electrode sheet at interval...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/431H01M50/411H01M50/449Y02E60/10
Inventor 王崇刚蔡芬敏陈杰杨山李载波王威
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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