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Organic-inorganic composite gel diaphragm and preparation method thereof

A composite gel separator, inorganic technology, applied in the direction of final product manufacturing, sustainable manufacturing/processing, climate sustainability, etc., can solve the problems of poor solution wettability, loose bonding, poor contact performance between polyolefin separator and electrode, etc. , to achieve the effect of increasing liquid absorption and improving performance

Active Publication Date: 2019-06-25
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used battery separators are generally made of polyethylene (PE) and polypropylene (PP) materials. Due to the high crystallinity and low polarity of polyethylene and polypropylene materials, the lyophilicity of polyethylene and polypropylene separators is poor, and the solution Poor wettability, etc.
At the same time, due to the lack of adhesion of polyolefin materials, the contact performance between the polyolefin separator and the electrode is poor, and the combination is not tight, which affects the electrochemical performance and safety performance of the battery.
[0004] At present, ceramic-coated diaphragms are introduced in the market to increase the liquid absorption rate of the diaphragm and improve the electrochemical performance of the battery; or to introduce PVDF-coated diaphragms to increase the adhesion to the electrodes and improve the safety performance of the battery; but the two often cannot Therefore, new diaphragm products are urgently needed to take into account the electrochemical performance and safety performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of organic-inorganic composite gel diaphragm of the present invention, its raw material composition comprises: base film, acrylate monomer, initiator, crosslinking agent, catalyst, solvent and ceramic powder, wherein the mass parts of each raw material are respectively : 26 parts of acrylate monomer, 0.15 parts of initiator, 8 parts of crosslinking agent, 0.2 parts of catalyst, 140 parts of solvent and 40 parts of ceramic powder.

[0023] Wherein, the base membrane is a porous rigid support material, preferably a ceramic porous diaphragm.

[0024] The preferred acrylate monomer is a combination of butyl acrylate, methyl methacrylate and hydroxyethyl acrylate.

[0025] The initiator is preferably lauryl peroxide.

[0026] The crosslinking agent is preferably dicyclohexylmethane diisocyanate.

[0027] The catalyst is preferably stannous octoate.

[0028] The solvent is preferably a combination of propylene carbonate and dimethyl carbonate.

[0029] The ceramic ...

Embodiment 2

[0036] An organic-inorganic composite gel diaphragm, its raw material composition includes: base film, acrylate monomer, initiator, crosslinking agent, catalyst, solvent and ceramic powder, wherein the mass parts of each raw material are: acrylate The quasi-monomer is 22 parts, the initiator is 0.1 part, the crosslinking agent is 4 parts, the catalyst is 0.1 part, the solvent is 130 parts, and the ceramic powder is 40-50 parts.

[0037] The base membrane is a porous rigid support material, and the porous rigid support material is preferably a glass fiber diaphragm.

[0038] The acrylates are preferably a mixture of ethoxyethoxyethyl acrylate, methoxypolyethylene glycol acrylate, and acrylamide.

[0039] The initiator is preferably azobisisoheptanonitrile.

[0040] The crosslinking agent preferably includes diphenylmethane diisocyanate.

[0041] The catalyst is preferably triethylenediamine.

[0042] Solvents include acetone.

[0043] The ceramic powder includes lithium lan...

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PUM

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Abstract

The invention discloses an organic-inorganic composite gel diaphragm, which comprises a base membrane and the following raw materials by mass: 5-55 parts of acrylate monomer, 0.1-0.15 parts of initiator, 3-15 parts of cross-linking agent, 0.05-1 part of catalyst, 130-140 parts of solvent and 40-50 parts of ceramic powder. The beneficial effects are as follows: when the gel diaphragm is applied toa battery, the liquid absorption rate of the diaphragm can be improved, and the diaphragm can firmly fit the pole pieces; and the battery does not smoke, catch fire or explode during safety tests on the battery such as needling, heat abusing and heavy impact, and the performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an organic-inorganic composite gel diaphragm, and also relates to a preparation method of the organic-inorganic composite gel diaphragm. Background technique [0002] The battery separator is located between the positive and negative electrodes of the battery, and is one of the important factors affecting battery cost and battery safety performance. The main function of the separator is to isolate the positive and negative electrodes and ensure the free passage of electronic insulation and ions inside the battery. [0003] Commonly used battery separators are generally made of polyethylene (PE) and polypropylene (PP) materials. Due to the high crystallinity and low polarity of polyethylene and polypropylene materials, the lyophilicity of polyethylene and polypropylene separators is poor, and the solution Poor wettability, etc. At the same time, because the polyole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCY02P70/50
Inventor 李峥冯玉川何泓材李帅鹏杨帆南策文
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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