Mixed paint for composite membrane of lithium ion battery, composite membrane and preparation method thereof, and lithium ion battery

A technology for lithium-ion batteries and composite diaphragms, applied in secondary batteries, battery pack components, circuits, etc., can solve the problem of insufficient blockage of polyolefin micropores, incomplete cutting of lithium ion transmission channels, and increased equipment and production costs and other problems to achieve the effect of avoiding curling, continuous coating process and reducing production cost

Inactive Publication Date: 2016-02-03
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the actual production and application process, it is found that there are still some problems in the composite diaphragm made by the above method.
This kind of composite diaphragm adopts the method of coating the organic polymer microsphere layer and the inorganic ceramic layer on both sides of the polyolefin microporous membrane respectively. The organic polymer microsphere and the inorganic ceramic particles are separated. When the battery temperature rises, The organic polymer microsphere layer melts and enters the pores of the microporous membrane. At this time, the temperature inside the battery is still at a relatively high temperature, which is generally higher than the melting temperature of the organic polymer microspheres, causing the organic polymer microspheres to be in

Method used

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  • Mixed paint for composite membrane of lithium ion battery, composite membrane and preparation method thereof, and lithium ion battery
  • Mixed paint for composite membrane of lithium ion battery, composite membrane and preparation method thereof, and lithium ion battery
  • Mixed paint for composite membrane of lithium ion battery, composite membrane and preparation method thereof, and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The mixed coating for lithium ion battery composite separator in the present embodiment comprises the component of following parts by weight: the particle diameter of 90 parts is the styrene-divinylbenzene copolymer (PS base) microsphere of 0.7 μm, 95 parts of Al with a particle size of 0.5 μm 2 o 3 Particles, 15 parts of binder, the binder includes the first binder and the second binder, the first binder is 10 parts of PVA, the second binder is 5 parts of CMC, styrene- The melting point or softening point temperature of the divinylbenzene copolymer microspheres is lower than the thermal melting temperature of the base film used in the lithium-ion battery separator.

[0041] The lithium-ion battery composite diaphragm in the present embodiment comprises a base film and a mixed paint layer coated on one side of the base film, and the mixed paint layer includes the following components in parts by weight: 95 parts with a particle diameter of 0.7 μm styrene-divinylbenzen...

Embodiment 2

[0054] The mixed coating for the lithium-ion battery composite separator in the present embodiment comprises the following components in parts by weight: 93 parts of acrylonitrile-acrylate copolymer microspheres with a particle diameter of 0.7 μm, and 92 parts with a particle diameter of 0.9 μm SiO 2 Particles, 15 parts of binder, the binder includes the first binder and the second binder, the first binder is 7 parts of LA132, the second binder is 8 parts of PVDF, acrylonitrile- The melting point or softening point temperature of the acrylate copolymer microspheres is lower than the thermal melting temperature of the base film used in the lithium-ion battery separator.

[0055] The lithium-ion battery composite separator in this embodiment includes a base film and a mixed paint layer coated on both sides of the base film, and the mixed paint layer includes the following components in parts by weight: 93 parts with a particle diameter of 0.7 μm acrylonitrile-acrylate copolymer...

Embodiment 3

[0064] The mixed coating for lithium-ion battery composite diaphragm in the present embodiment comprises the component of following parts by weight: the particle diameter of 90 parts is the ethylene-vinyl acetate copolymer (EVA) microsphere of 0.7 μ m, the particle diameter of 93 parts 1.0μm TiO 2 Granules, 15 parts of binder, the binder includes the first binder and the second binder, the first binder is 10 parts of LA132, the second binder is 7 parts of PVDF, ethylene-acetic acid The melting point or softening point temperature of the vinyl ester copolymer microspheres is lower than the thermal melting temperature of the base film used in the lithium-ion battery separator.

[0065] The lithium-ion battery composite diaphragm in the present embodiment comprises a base film and a mixed paint layer coated on both sides of the base film, and the mixed paint layer includes the following components in parts by weight: 90 parts with a particle diameter of 0.7 μm ethylene-vinyl ace...

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Abstract

The invention relates to mixed paint for a composite membrane of a lithium ion battery, and also relates to the composite membrane using the mixed paint and a preparation method thereof, and the lithium ion battery, and belongs to the technical field of the lithium ion batteries. The mixed paint for the composite membrane of the lithium ion battery is prepared from the following components in parts by weight: 45 to 63 parts of organic macromolecule microspheres, 35 to 53 parts of inorganic ceramic particles and 2 to 10 parts of an additive, wherein a melting point temperature or a softening point temperature of the organic macromolecule microspheres is lower than a hot smelting temperature of a base membrane used for the membrane of the lithium ion battery. According to the composite membrane of the lithium ion battery, which utilizes the mixed paint, a micro-pore blocking effect of the organic macromolecule microspheres is more sufficient, a lithium ion transmission channel is completely cut off and the safety of the lithium ion battery is greatly improved.

Description

technical field [0001] The invention relates to a mixed coating for a lithium-ion battery composite diaphragm, and also relates to a composite diaphragm using the mixed coating, a preparation method thereof and a lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in many fields including portable electronic products because of their advantages such as high energy ratio, no memory effect, and long life. However, under various complex application conditions, lithium-ion batteries have Potential hazard of explosion and fire. With the development of the electric vehicle industry, the defects in the safety performance of lithium-ion batteries have become more obvious, which seriously restricts the application of lithium-ion batteries in power batteries and other fields. [0003] Judging from current research reports, factors such as overcharging, internal and external short cir...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/40H01M50/403H01M50/411H01M50/434H01M50/446
CPCH01M10/0525H01M50/446H01M50/403Y02E60/10
Inventor 白莉怀永建赵金保贾海艾新平王海文
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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