Functional coating diaphragm for lithium ion battery, and preparation method thereof

A lithium-ion battery, functional technology, applied in the direction of secondary battery, battery pack parts, secondary battery repair/maintenance, etc., can solve the problem that the thermal deformation resistance of the diaphragm is not significantly improved, so as to facilitate industrial production and improve durability Thermal deformation ability, the effect of simple preparation method

Inactive Publication Date: 2020-08-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent provides a method for preparing a polymer microsphere-coated diaphragm, which can effectively reduce the closing cell temperature of polyethylene-based membranes, but does not significantly improve the thermal deformation resistance of the diaphragm

Method used

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  • Functional coating diaphragm for lithium ion battery, and preparation method thereof
  • Functional coating diaphragm for lithium ion battery, and preparation method thereof
  • Functional coating diaphragm for lithium ion battery, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] S1: Preparation of pretreated boehmite ceramic powder: first add 5Kg boehmite ceramic powder and 0.02Kg silane coupling agent KH570 into a high-speed mixer and mix evenly to obtain pretreated boehmite ceramic powder;

[0026] S2: Preparation of modified boehmite ceramic slurry: first dissolve 0.04Kg ammonium polyacrylate dispersant and 0.04Kg sodium carboxymethylcellulose thickener in 5Kg deionized water; After adding 3Kg of boehmite ceramic powder and 0.8Kg of polyethylene emulsion, it is uniformly dispersed at high speed; finally, 0.2Kg of polyacrylate binder and 0.02Kg of wetting agent HW-107 are added and stirred evenly to obtain modified boehmite ceramic slurry.

[0027] S3: Preparation of coated diaphragm: The modified boehmite ceramic slurry prepared in the above step S2 is coated on one side of the 14 μm PE base film by micro gravure roller coating, and the thickness of the functional coating is controlled to be 3 μm, and the surface density of the coating is 3...

Embodiment 2

[0029] S1: Preparation of pretreated alumina ceramic powder: first add 5Kg of alumina ceramic powder and 0.04Kg of silane coupling agent KH570 into a high-speed mixer and mix evenly to obtain pretreated alumina ceramic powder;

[0030] S2: Preparation of modified alumina ceramic slurry: first dissolve 0.04Kg ammonium polyacrylate dispersant and 0.04Kg sodium carboxymethylcellulose thickener in 5Kg deionized water; After adding 3Kg of boehmite ceramic powder and 0.8Kg of ethylene-vinyl acetate copolymer emulsion, they are uniformly dispersed at high speed; finally, 0.2Kg of polyacrylate binder and 0.02Kg of wetting agent HW-107 are added and stirred evenly to obtain modified oxidation Aluminum ceramic paste.

[0031] S3: Preparation of coated diaphragm: The modified alumina ceramic slurry prepared in the above step S2 is coated on one side of the 14 μm PE base film by micro gravure roll coating, and the thickness of the functional coating is controlled to be 3 μm, and the surfa...

Embodiment 3

[0033] S1: Preparation of pretreated alumina ceramic powder: first add 5Kg of alumina ceramic powder and 0.02Kg of silane coupling agent KH570 into a high-speed mixer and mix evenly to obtain pretreated alumina ceramic powder;

[0034] S2: Preparation of modified alumina ceramic slurry: first dissolve 0.04Kg ammonium polyacrylate dispersant and 0.04Kg sodium carboxymethylcellulose thickener in 5Kg deionized water; Add 3Kg of alumina ceramic powder and 0.6Kg of polyethylene emulsion and disperse evenly at high speed; finally add 0.2Kg of polyacrylate binder and 0.02Kg of wetting agent HW-107 and stir evenly to obtain modified alumina ceramic slurry .

[0035] S3: Preparation of coated diaphragm: The modified alumina ceramic slurry prepared in the above step S2 is coated on one side of the 14 μm PE base film by micro gravure roll coating, and the thickness of the functional coating is controlled to be 3 μm, and the surface density of the coating is 4.9g / ㎡, that is, the function...

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Abstract

The invention discloses a functional coating diaphragm for a lithium ion battery, and a preparation method of the functional coating diaphragm. The preparation method comprises the following steps: uniformly mixing ceramic powder with a coupling agent to obtain pretreated ceramic powder; adding a dispersing agent and a thickening agent into deionized water, dissolving, then adding the pretreated ceramic powder and polymer emulsion, uniformly stirring and dispersing, adding a binding agent and a wetting agent, and uniformly stirring and dispersing to obtain modified ceramic slurry; coating onesurface or two surfaces of a base membrane with the modified ceramic slurry in a coating manner, and drying to obtain the functional coating diaphragm. According to the invention, through coating pretreatment of the coupling agent, the ceramic powder is non-polar, so that the acting force between the ceramic powder and a polymer is enhanced; according to the functional coating diaphragm prepared by the invention, pore closing of the diaphragm at a relatively low temperature can be realized, and the thermal deformation resistance of the diaphragm at a high temperature can be improved, so that the safety performance of a power battery can be effectively improved; and the preparation method is simple, low in cost and convenient for industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery separators, and in particular relates to a functional coating separator for lithium-ion batteries and a preparation method thereof. Background technique [0002] At present, the demand for lithium-ion battery products with high energy density and long cycle life has increased dramatically. In recent years, spontaneous combustion or explosion accidents of 3C electronics and automotive power lithium-ion batteries have been increasing, all of which require us to pay more attention to the safety performance of lithium-ion batteries. As one of the four main materials of lithium-ion batteries, the separator does not directly participate in the electrochemical reaction, but it has an important influence on the electrical performance and safety performance of lithium-ion batteries. During the high-power charging and discharging process of lithium-ion batteries and external infl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/42H01M10/0525H01M50/403H01M50/434H01M50/446H01M50/449
CPCH01M10/4235H01M10/0525H01M50/431H01M50/403H01M50/449Y02E60/10
Inventor 谢玉虎陈萌李凯徐立洋陈龙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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