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Lithium ion battery composite separation membrane and lithium ion battery containing lithium ion battery composite separation membrane

A technology for lithium-ion batteries and composite diaphragms, applied in the field of composite diaphragms and the preparation of said composite diaphragms, can solve the problems of low glass transition temperature, gel formation or swelling, heat shrinkage resistance not maintained in liquid electrolyte, etc.

Inactive Publication Date: 2016-03-09
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above preparation of polyolefin composite separators, the binders used are polyvinylidene fluoride, polyacrylate, polyurethane, etc., these binders have a low glass transition temperature (<100 ° C) or melting point, and these materials are in lithium Swell or form gel in the electrolyte (dimethyl carbonate, diethyl carbonate, etc.) Afterwards, the binder and the electrolyte will form a gel or swell, and the heat shrinkage resistance in the dry state is not maintained in the liquid electrolyte.

Method used

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  • Lithium ion battery composite separation membrane and lithium ion battery containing lithium ion battery composite separation membrane
  • Lithium ion battery composite separation membrane and lithium ion battery containing lithium ion battery composite separation membrane
  • Lithium ion battery composite separation membrane and lithium ion battery containing lithium ion battery composite separation membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0060]At room temperature, after fully dissolving 10 parts of polyetherimide (GE, Ultem1000) with 90 parts of N-methylpyrrolidone under stirring conditions, slowly add isopropanol to the resulting solution at room temperature until the solution just appears cloudy , to obtain a suspension, and continue to stir and mature the resulting suspension for 12h. Weigh out 85 parts of alumina with an average particle size of 0.3 μm, and add linoleic acid glyceride to the aged polyetherimide suspension according to 2.5% by weight of the alumina. After stirring and dispersing evenly, add 85 parts of aluminum oxide weighed into the obtained dispersion, and disperse by ball milling to form a stable suspension with a solid content of 30%, which is the coating solution.

[0061] A polyethylene single-layer diaphragm with a thickness of 16 μm and a porosity of 40% prepared by a wet method is immersed in the obtained coating solution, and a wire bar coater is used on both sides to control the ...

Embodiment 2

[0063] At room temperature, take 7 parts of polym-phenylene isophthalamide (DuPont, Nomex) and fully dissolve it with a mixed solution of 100 parts of N,N-dimethylacetamide and 5 parts of lithium chloride under stirring conditions , slowly add water to the obtained solution at room temperature until the solution just becomes turbid to obtain a suspension, and continue to stir and mature the obtained suspension for 12 hours. Weigh out 50 parts of silicon dioxide with an average particle diameter of 0.012 μm, and add triethyl phosphate to the aged polym-phenylene isophthalamide suspension according to 5% by weight of the silicon dioxide. After stirring and dispersing evenly, add 50 parts of silicon dioxide weighed to the obtained dispersion, and at the same time add 15 parts of micronized polyethylene wax with a melting point of 85°C, and disperse with a ball mill to form a stable suspension with a solid content of 25%. , which is the coating solution.

[0064] Immerse a uniaxi...

Embodiment 3

[0066] At room temperature, take 20 parts of phenolphthalein polyaryletherketone (Changchun Institute of Chemical Engineering, PEK-C) and fully dissolve it with 100 parts of tetrahydrofuran under stirring conditions, then slowly add ethanol to the resulting solution at room temperature until the solution just appears cloudy, A suspension was obtained, and the obtained suspension was continued to be stirred and matured for 12 h. Weigh out 90 parts of barium sulfate with an average particle size of 0.8 μm, and add castor oil to the aged polyaryletherketone suspension at 1.5% by weight of the barium sulfate. After stirring and dispersing evenly, add 90 parts of barium sulfate weighed into the obtained dispersion, and add 5 parts of polypropylene wax with a melting point of 145 °C at the same time, and disperse with a ball mill to form a stable suspension with a solid content of 40%, which is Coating fluid.

[0067] The resulting coating solution is sprayed to form a layer of uni...

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Abstract

The present invention relates to a lithium ion battery composite separation membrane, which comprises: (a) a porous substrate having pores; and (b) an organic / inorganic composite layer formed by coating at least a surface of the porous substrate or partial surface area of the porous substrate with a mixture containing inorganic particles, one or a plurality of polymer binders selected from polyetherimide, polyetherketoneketone and polyisophthaloyl metaphenylene diamine, and an optional high temperature closed-cell material, wherein the inorganic particles are connected and are fixed with the polymer binder, and the gap between the inorganic particles forms the pore. According to the present invention, the organic / inorganic composite layer on the separation membrane is firmly bonded onto the porous substrate, and the polymer binder in the organic / inorganic composite layer substantially does not swell in the electrolyte, and further has good heat-shrinkage resistance so as to ensure the safety performance of the lithium ion battery. The present invention further relates to a method for preparing the composite separation membrane and an ion battery containing the composite separation membrane.

Description

technical field [0001] The invention relates to a diaphragm for a lithium ion battery, which is a composite diaphragm. The present invention also relates to a method for preparing the composite separator and a lithium ion battery comprising the composite separator. Background technique [0002] Due to the advantages of high specific energy density, good cycle performance and no pollution to the environment, lithium-ion batteries have been widely used in communication electronic products such as mobile phones, video recorders, and tablet computers. In recent years, with the improvement of the safety performance of electrode materials, lithium-ion batteries have also begun to be used in some high-power power batteries such as electric vehicles, electric bicycles, and electric tools. Power lithium-ion batteries have higher power / energy density than communication lithium-ion batteries, so higher requirements are placed on the safety performance of power lithium-ion batteries. ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/18H01M10/0525H01M50/403H01M50/423H01M50/446H01M50/457
CPCY02E60/10
Inventor 周建军王晶李林
Owner BEIJING NORMAL UNIVERSITY
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