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

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Problems solved by technology

[0007] The purpose of the present invention is to provide a lithium-ion battery composite separator to solve the

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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Example Embodiment

[0039] Example 1

[0040] The lithium ion battery composite separator of this embodiment includes 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 Heat-resistant coating, the melting temperature of the hot-melt polymer coating is lower than the heat-melting temperature of the base film, and the melting temperature of the heat-resistant coating is higher than the heat-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, the particle size of styrene-diethylene copolymer is 0.7μm; heat-resistant coating Including 95 parts of heat-resistant polymer material polyimide, 5 parts of binder PVDF, the particle size of polyimide is 1.1μm; the thickness of the above-mentioned composite membrane is 28μm, and the thickness of polyet...

Example Embodiment

[0057] Example 2

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

Example Embodiment

[0067] Example 3

[0068] The lithium ion battery composite separator of this embodiment includes a base film, the base film is a polypropylene microporous film, one side of the polypropylene microporous film is coated with a hot melt polymer coating, and the other side is coated with Heat-resistant coating, the melting temperature of the hot-melt polymer coating is lower than the heat-melting temperature of the base film, and the melting temperature of the heat-resistant coating is higher than the heat-melting temperature of the base film; The molecular coating includes 90 parts of hot-melt polymer material ethylene-vinyl acetate copolymer (EVA, with 9% VA content), 10 parts of adhesive LA132 (polyacrylic acid copolymer), and 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 PTFE is 1μ...

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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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