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Preparation method of heat-resistant lithium battery diaphragm

A lithium battery separator, heat-resistant technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of poor heat resistance, weak bonding between the separator ceramic layer and the base film, and the ceramic layer falling off. Good heat resistance, anti-shrinkage, anti-shedding effect

Active Publication Date: 2018-08-31
瑞固新能(上海)材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: Aiming at the weak bonding force between the separator ceramic layer and the base film prepared so far, the ceramic layer is prone to fall off, especially the problem of poor heat resistance above 140°C

Method used

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  • Preparation method of heat-resistant lithium battery diaphragm
  • Preparation method of heat-resistant lithium battery diaphragm
  • Preparation method of heat-resistant lithium battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] a. Preparation of water-based ceramic slurry: Add 40 parts of alumina and 0.1 part of sodium dodecylsulfonate to 50 parts of deionized water, and obtain a uniform solution after grinding for 1 hour, then add 0.1 part of suspension stabilizer, 0.1 Part of polyoxyethylene polyoxypropylene pentaerythritol ether, 0.1 part of polyoxyethylene alkylamide, 0.1 part of sodium hydroxypropyl sulfonate methacrylate, 1 part of the first binder, 1 part of the second binder, low-speed dispersion for 30 minutes , to obtain water-based ceramic slurry;

[0031] b. Coating: apply the water-based ceramic slurry prepared in step a to one side of a 12 μm polyethylene monolayer film by gravure roll coating to obtain a water-based ceramic slurry coating, and then in a temperature of 70 ° C Bake for 1 min under the same conditions to obtain a heat-resistant lithium battery separator, in which the thickness of the ceramic coating is 4 μm.

[0032] Among them, the average particle size of alumin...

Embodiment 2

[0036] a. Preparation of water-based ceramic slurry: Add 45 parts of alumina and 0.2 parts of sodium lauryl sulfate to 60 parts of deionized water, and obtain a uniform solution after grinding for 1 hour, then add 0.2 parts of suspension stabilizer, 0.3 parts of Polyoxyethylene polyoxypropanol amine ether, 0.2 part of fatty alcohol polyoxyethylene ether, 0.2 part of sodium hydroxypropyl sulfonate methacrylate, 2 parts of the first binder, 2 parts of the second binder, low-speed dispersion for 20 minutes , to obtain water-based ceramic slurry;

[0037] b. Coating: apply the water-based ceramic slurry prepared in step a on one side of the 12 μm polyethylene monolayer film by anilox roller coating to obtain a water-based ceramic slurry coating, and then apply the water-based ceramic slurry at a temperature of 60 ° C. Bake for 1 min under the condition of , to obtain a heat-resistant lithium battery separator, in which the thickness of the ceramic coating is 4 μm.

[0038] Among ...

Embodiment 3

[0042] a. Preparation of water-based ceramic slurry: Add 55 parts of boehmite and 0.2 parts of polyacrylic acid ammonium salt to 75 parts of deionized water, obtain a uniform solution after grinding for 1 hour, then add 0.2 parts of suspension stabilizer, 0.1 part of polyacrylate Oxyethylene polyoxypropylene pentaerythritol ether, 0.3 part of polyoxyethylene alkylamide, 0.5 part of sodium isethionate, 3 parts of the first binder, 2 parts of the second binder, dispersed at a low speed for 40 minutes to obtain a water-based ceramic slurry material;

[0043] b. Coating: apply the water-based ceramic slurry prepared in step a on one side of the 12 μm polyethylene monolayer film by anilox roller coating to obtain a water-based ceramic slurry coating, and then apply the water-based ceramic slurry at a temperature of 60 ° C. Bake for 1 min under the condition of , to obtain a heat-resistant lithium battery separator, in which the thickness of the ceramic coating is 4 μm.

[0044] Am...

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Abstract

The invention discloses a preparation method of a heat-resistant lithium battery diaphragm. The preparation method comprises the steps that an inorganic material and a dispersing agent are added intodeionized water, and the mixture is ground to obtain a uniform solution; then a suspension stabilizer, a defoaming agent, a wetting agent, a surfactant, a first adhesive and a second adhesive are added, low-speed dispersing is carried out, and water-based ceramic slurry is obtained; after a base diaphragm is coated with the slurry, the heat-resistant lithium battery diaphragm is obtained. The diaphragm has a relatively good liquid absorption rate, peel strength and thermal stability.

Description

technical field [0001] The invention relates to the technical field of coated diaphragms, in particular to a method for preparing a heat-resistant lithium battery diaphragm. Background technique [0002] Polyolefin separators are cheap and widely used in lithium-ion batteries. However, due to the poor heat resistance of such separator materials and poor affinity with the organic solvent of the electrolyte, the electrolyte retention ability is poor. The performance of the battery has a certain impact. [0003] The slurry used in the coating process is made up of ceramic particles, binders, solvents and surfactants according to a certain formula. By coating the ceramic slurry on one side or both sides of the polyolefin, the thermal stability of the separator can be improved, its mechanical strength can be improved, the positive and negative large-area contact caused by the shrinkage of the separator can be prevented, and its puncture resistance can be improved. Prevent the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C09D1/00C09D7/65C09D7/63H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/449H01M50/451
CPCH01M10/0525C09D7/63C09D7/65C09D1/00C09D5/18C08J2323/06C08J2323/12C08J7/0427H01M50/403H01M50/411Y02E60/10
Inventor 徐健冯中军王绍华傅乐峰
Owner 瑞固新能(上海)材料科技有限公司
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