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A preparing method of a lithium ion battery composite separating membrane

A technology of lithium-ion batteries and composite diaphragms, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., can solve the problems of large gaps between diaphragms and pole pieces, poor safety performance of diaphragms, etc., and achieve Effects of improving mechanical properties and heat resistance, and improving battery safety

Active Publication Date: 2015-06-03
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the disadvantages of conventional PP or PE lithium-ion battery diaphragms, such as poor safety performance and large gap between the diaphragm and pole pieces, and provides a lithium-ion battery composite diaphragm with good safety performance and tight connection between the diaphragm and pole pieces. Preparation

Method used

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  • A preparing method of a lithium ion battery composite separating membrane

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Experimental program
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Effect test

Embodiment 1

[0020] Dissolve 1 part of polyvinylidene fluoride in 54 parts of N-methylpyrrolidone, then add 30 parts of aluminum oxide and mix evenly to form a slurry. The slurry is uniformly sprayed on both sides of the support body of the composite diaphragm to form an oxide coating, and then dried. The support body is a 25 micron PE film. The oxide coating thickness is 1 micron. Dissolve 1 part of polyvinylidene fluoride in 70 parts of dimethyl sulfoxide, then add 5 parts of aramid 1414, and mix evenly to form an aramid resin coating solution. The dried oxide-coated diaphragm is dipped into an aramid resin coating solution to form an aramid resin coating, and then dried. The thickness of the aramid resin coating is 10 microns. Dissolve 5 parts of PVDF-HFP copolymer in 99 parts of acetone and mix evenly, and then spray evenly on the outside of the aramid resin coating to form a PVDF-HFP copolymer coating. During the coating process, pore-forming treatment is performed and then dried. ...

Embodiment 2

[0023] Dissolve 1.5 parts of polyvinylidene fluoride in 60 parts of N-methylpyrrolidone, then add 38 parts of magnesium oxide and mix uniformly to form a slurry. The slurry is evenly sprayed on both sides of the support of the composite diaphragm to form an oxide coating, and then dried. The support is a 25 micron PP-PE composite film. The oxide coating thickness is 5 microns. Dissolve 2 parts of polyvinylidene fluoride in 75 parts of dimethyl sulfoxide, then add 6 parts of aramid 1414, and mix evenly to form an aramid resin coating solution. The dried oxide-coated diaphragm is dipped into an aramid resin coating solution to form an aramid resin coating, and then dried. The thickness of the aramid resin coating is 5 microns. Dissolve 3 parts of PVDF-HFP copolymer in 97 parts of acetone and mix evenly, and then spray evenly on the outside of the aramid resin coating to form a PVDF-HFP copolymer coating. During the coating process, pore-forming treatment is performed and then ...

Embodiment 3

[0026] Dissolve 2 parts of polyvinylidene fluoride in 68 parts of N-methylpyrrolidone, then add 45 parts of aluminum oxide and mix evenly to form a slurry. The slurry is evenly sprayed on both sides of the support body of the composite diaphragm to form an oxide coating, and then dried. The support body is a 25 micron PP film. The oxide coating thickness is 10 microns. Dissolve 3 parts of polyvinylidene fluoride in 80 parts of dimethyl sulfoxide, then add 7 parts of aramid 1414, and mix evenly to form an aramid resin coating solution. The dried oxide-coated diaphragm is dipped into an aramid resin coating solution to form an aramid resin coating, and then dried. The thickness of the aramid resin coating is 1 micron. Dissolve 1 part of PVDF-HFP copolymer in 95 parts of acetone and mix evenly, and then spray evenly on the outside of the aramid resin coating to form a PVDF-HFP copolymer coating. During the coating process, pore-forming treatment is performed and then dried. Co...

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Abstract

A preparing method of a lithium ion battery composite separating membrane is disclosed. A common PP or PE separating membrane is coated with an oxide coating, an aramid fiber resin coating and a PVDF-HFP copolymer layer to obtain the composite separating membrane. The composite separating membrane enhances mechanical performance and heat resistance of the separating membrane and enhances safety performance of batteries.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a lithium ion battery composite diaphragm. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. As the energy density of the existing lithium-ion battery increases, its safety performance is also greatly affected, and safety accidents emerge in endlessly. The existing lithium-ion battery separators are mostly made of polypropylene (PP) or polyethylene (PE), which has a low melting point and is easy to shrink when heated, resulting in a short circuit between the positive and negative electrodes and low battery safety. The gap between the battery separator and the pole piece made of this kind of separator is large, and the ability to retain the electrolyte is poor. For the wound battery,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C08J7/04C09D1/00C09D127/16C09D7/12H01M50/403H01M50/414H01M50/431H01M50/489
CPCC09D7/65C09D127/16C09D177/06C09D1/00C08J7/0423H01M50/403H01M50/409Y02E60/10
Inventor 王涌吕豪杰高新宝陈军
Owner WANXIANG 123 CO LTD
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