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Lithium ion battery composite separator, preparation method thereof, and lithium ion battery

A technology of lithium-ion batteries and composite diaphragms, which is applied in the manufacture of electrolyte batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problems of poor wettability with electrolytes, improve liquid retention performance, prevent internal short circuits, and improve The effect of cycle performance

Inactive Publication Date: 2015-12-09
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a lithium-ion battery composite separator to solve the problem of poor wettability between the lithium-ion battery composite separator and electrolyte in the prior art

Method used

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  • Lithium ion battery composite separator, preparation method thereof, and lithium ion battery
  • Lithium ion battery composite separator, preparation method thereof, and lithium ion battery
  • Lithium ion battery composite separator, preparation method thereof, and lithium ion battery

Examples

Experimental program
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Embodiment 1

[0040] The lithium-ion battery composite diaphragm of the present embodiment comprises a base film, the base film is a polyethylene microporous film, one side of the polyethylene microporous film is coated with a hot-melt polymer coating, and the other side is coated with a Heat-resistant coating, the melting temperature of the hot-melt polymer coating is lower than the thermal melting temperature of the base film, and the melting temperature of the heat-resistant coating is higher than the thermal melting temperature of the base film; The molecular coating includes 90 parts of hot-melt polymer material styrene-diethylene copolymer (PS-based copolymer), 10 parts of binder PVA, and the particle size of styrene-divinyl copolymer is 0.7 μm; heat-resistant coating Including 95 parts of heat-resistant polymer material polyimide, 5 parts of binder PVDF, the particle size of polyimide is 1.1 μm; the thickness of the above composite diaphragm is 28 μm, of which the thickness of polyeth...

Embodiment 2

[0058] The lithium-ion battery composite diaphragm of the present embodiment includes a base film, which is a polypropylene microporous membrane, one side of the polypropylene microporous membrane is coated with a hot-melt polymer coating, and the other side is coated with a Heat-resistant coating, the melting temperature of the hot-melt polymer coating is lower than the thermal melting temperature of the base film, and the melting temperature of the heat-resistant coating is higher than the thermal melting temperature of the base film; Molecular coating includes 93 parts of hot-melt polymer material acrylonitrile-acrylate copolymer, 7 parts of binder LA132 (polyacrylic copolymer), the particle size of acrylonitrile-acrylate copolymer is 1.2 μm; heat-resistant The coating includes 85 parts of heat-resistant polymer material polyimide, 5 parts of binder PVDF, inorganic filler Al 2 o 3 10 parts, the particle size of polyimide is 2.0μm, inorganic filler Al 2 o 3 The particle s...

Embodiment 3

[0068] The lithium-ion battery composite diaphragm of the present embodiment includes a base film, which is a polypropylene microporous membrane, one side of the polypropylene microporous membrane is coated with a hot-melt polymer coating, and the other side is coated with a Heat-resistant coating, the melting temperature of the hot-melt polymer coating is lower than the thermal melting temperature of the base film, and the melting temperature of the heat-resistant coating is higher than the thermal melting temperature of the base film; The molecular coating includes 90 parts of hot-melt polymer material ethylene-vinyl acetate copolymer (EVA, wherein the VA content is 9%), 10 parts of binder LA132 (polyacrylic acid copolymer), ethylene-vinyl acetate copolymer The particle size is 0.7μm; the heat-resistant coating includes 90 parts of heat-resistant polymer material polytetrafluoroethylene, 7 parts of binder PVDF, and inorganic filler SiO 2 3 parts, the particle size of polytet...

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Abstract

The invention relates to a lithium ion battery composite separator, a preparation method thereof, and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion battery composite separator comprises a base film; one side of the base film is coated with a hot-melting polymer coating; the other side of the base film is coated with a heat-proof coating; the melting temperature of the hot-melting polymer coating is lower than the hot-melting temperature of the base film; the melting temperature of the heat-proof coating is higher than the hot-melting temperature of the base film; the hot-melting polymer coating comprises the following ingredients by weight: 50 to 98 parts of one or more hot-melt polymer materials, and 2 to 50 parts of one or more agglomerants; the heat-proof coating comprises the following ingredients by weight: 50 to 92 parts of one or more heat-proof polymer materials, and 3 to 20 parts of one or more agglomerants. The lithium ion battery composite separator is favorable in liquid sucking and retention properties, low in heat blocking hole temperature, and high in separator breaking temperature, thereby being capable of obviously improving the safety and the electrochemical property of the battery.

Description

technical field [0001] The invention relates to a lithium-ion battery composite diaphragm, a preparation method thereof and a lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] With the continuous expansion of the application range of lithium-ion batteries, the safety of lithium-ion itself has attracted more and more attention. The development of the electric vehicle industry has put forward more stringent requirements on the safety performance of lithium-ion batteries. There are many factors that cause safety problems of lithium-ion batteries, such as overcharging, internal and external short circuits, extrusion, collisions, etc. may induce safety problems of lithium-ion batteries. These factors are closely related to the thermal runaway of lithium-ion batteries in essence, that is, when the internal temperature rise of lithium-ion batteries is large due to various reasons during use, side reactions inside the batt...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/058H01M50/403H01M50/411H01M50/414H01M50/417H01M50/423H01M50/426H01M50/451H01M50/457
CPCH01M10/058H01M50/40H01M50/403H01M50/409Y02E60/10Y02P70/50
Inventor 白莉怀永建赵金保王海文张海峰贾海
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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