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Coating slurry, lithium-ion battery separator and preparation methods of coating slurry and lithium-ion battery separator

A coating slurry, polar monomer technology, applied in the direction of coating, battery pack parts, separator/film/diaphragm/spacer element, etc. The battery hardness cannot be guaranteed and other problems, to achieve the effect of improving dimensional stability, improving battery safety performance, and high bonding performance

Inactive Publication Date: 2017-03-22
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ceramic coated separator cannot effectively improve the bonding performance between the separator and the pole piece, so the hardness of the battery cannot be guaranteed.

Method used

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  • Coating slurry, lithium-ion battery separator and preparation methods of coating slurry and lithium-ion battery separator
  • Coating slurry, lithium-ion battery separator and preparation methods of coating slurry and lithium-ion battery separator

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preparation example Construction

[0031] Correspondingly, the present invention also provides a preparation method of coating slurry, comprising the following steps: mixing 5-40 parts by weight of inorganic nanoparticles, 30-90 parts by weight of gel polymer, 0.5-5 parts by weight of polar monomer mixing and polymerization to obtain a coating slurry, and the polar monomer is one or more of acrylic acid, acrylonitrile, methylol acrylamide, and acrylamide.

[0032] As a preferred solution, the inorganic nanoparticles are preferably one or more of nano-silicon oxide, nano-alumina, nano-barium titanate, nano-titanium oxide, nano-calcium carbonate, and nano-zirconia. The monomer of the gel polymer is preferably one or more of butyl acrylate, ethyl acrylate, hydroxyethyl acrylate, methyl methacrylate, and styrene.

[0033] As a preferred solution, in the process of preparing coating slurry, the present invention also adds emulsifier and initiator. The emulsifier and initiator used in the present invention are prefe...

Embodiment 1

[0045] Such as figure 1 As shown, a high-adhesive coating slurry is polymerized with inorganic nanoparticles, gel polymer monomers, and polar monomers, wherein the inorganic nanoparticles are nano-barium titanate, accounting for 10 parts of the total solids; The gel polymer is a copolymer of butyl acrylate and hydroxyethyl acrylate, the copolymerization ratio is 7:3, accounting for 89 parts of the total solids; the polar monomer is acrylonitrile, accounting for 1 part of the total solids; slurry The solid content of the material is 20%, and the average particle size is 300nm.

Embodiment 2

[0047] Such as figure 1 As shown, a high-adhesive coating slurry is polymerized with inorganic nanoparticles, gel polymer monomers, polar monomers, wherein the inorganic nanoparticles are nano-alumina, accounting for 20 parts of the total solids; The gel polymer is a copolymer of methyl methacrylate and styrene, the copolymerization ratio is 5:5, accounting for 78 parts of the total solids; the polar monomer is acrylonitrile, accounting for 2 parts of the total solids; The solid content of the material is 30%, and the average particle size is 500nm.

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Abstract

The invention relates to the technical field of lithium-ion batteries and provides coating slurry, a lithium-ion battery separator and preparation methods of the coating slurry and the lithium-ion battery separator. The coating slurry is prepared from, in parts by weight, 5-40 parts of inorganic nanoparticles, 30-90 parts of gel polymer monomers and 0.5-5 parts of polar monomers through mixing and a polymerization reaction; the coating slurry is applied to one side or two sides of a base membrane, and the lithium-ion battery separator is obtained after hot air drying. In the hot pressing process of the battery, a gel polymer in a coating adsorbs electrolyte and can form a film on the separator, and the separator and a pole piece are bonded together through van der waals force between a polar functional group on a polymer molecular chain and an electrode material. The lithium-ion battery separator and the pole piece have the good bonding property, and the hardness of the battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a coating slurry, a lithium ion battery diaphragm and a preparation method thereof. Background technique [0002] With the continuous expansion of the application field of lithium-ion batteries, the upgrading of digital products is accelerating, and the requirements for the size and thickness of mobile phones and tablet computers are getting thinner and thinner, but thinner batteries will inevitably bring some hidden dangers in safety performance, such as The hardness and impact resistance of thin batteries are poor, resulting in a decrease in the safety performance of digital products. Therefore, how to realize the integration of the separator and the pole piece, thereby improving the hardness of the battery has become an urgent problem to be solved at present. [0003] In the lithium battery structure, the separator is one of the key inner components, which isola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D151/00C09D7/12C08F265/04C08F220/44C08F220/06C08F220/58C08F257/02C08F220/56H01M2/14H01M2/16C08J7/04C08L23/06C08L23/12B32B33/00H01M50/403H01M50/411H01M50/449H01M50/46
CPCC09D7/61C09D151/003C08F257/02C08F265/04C08J7/042C08K3/22C08K3/24C08K3/26B32B33/00C08J2323/06C08J2323/12C08J2451/00C08K2003/2241C08K2003/2227C08K2003/2244C08K2003/265C08K2201/011H01M50/403H01M50/409C08F220/44C08F220/06C08F220/56Y02E60/10
Inventor 廖柳辉曹江胡敏谭斌廖培龙杨雪梅
Owner SHENZHEN SENIOR TECH MATERIAL