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A kind of composite gel polymer electrolyte, its preparation method and application

A composite gel and polymer technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of affecting the performance of polymer electrolytes, weak interfacial interaction, and inability to give full play to the advantages, so as to improve the cycle Effects of safety, enhanced interaction, and improved cycle stability

Active Publication Date: 2020-11-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current process of preparing composite gel polymer electrolytes, re-agglomeration of dispersed fillers is inevitable, which seriously affects the performance of polymer electrolytes.
On the other hand, this composite gel polymer electrolyte has poor adhesion to battery electrodes, and the interface interaction formed by the two is weak. When the composite gel polymer electrolyte is applied in lithium batteries, its advantages cannot be fully utilized.

Method used

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  • A kind of composite gel polymer electrolyte, its preparation method and application
  • A kind of composite gel polymer electrolyte, its preparation method and application
  • A kind of composite gel polymer electrolyte, its preparation method and application

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preparation example Construction

[0044] The present invention provides a kind of preparation method of above-mentioned composite gel polymer electrolyte, comprises the following steps:

[0045] A. Disperse the filler in the ionic liquid dispersant by means of stirring, and the ionic liquid dispersant is the second ionic liquid to obtain a uniformly dispersed second ionic liquid / filler dispersion system.

[0046] B. Add photoinitiator, crosslinking agent, lithium salt and first ionic liquid monomer into the second ionic liquid / filler dispersion system described in step A, stir and mix to obtain composite gel polymer electrolyte precursor; The photoinitiator is 2,4,6-(trimethylbenzoyl)diphenylphosphine oxide, 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, 2-hydroxy-2-methyl Base-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone, 1-hydroxycyclohexylphenyl ketone and 2-methyl-2-(4-morpholinyl)-1- One or more of [4-(methylthio)phenyl]-1-propanone; the cross-linking agent is ethylene glycol dimethacrylate, 2,5-d...

Embodiment 1

[0051] Using molybdenum disulfide as a filler and 1-vinyl-3-butylimidazole-bistrifluoromethanesulfonimide salt as a monomer, prepare poly[1-vinyl-3-butylimidazole-bistrifluoromethanesulfonyl imide salt according to the following steps] Fluoromethanesulfonylimide salt] / molybdenum disulfide composite gel polymer electrolyte:

[0052] (1) 0.3 g of molybdenum disulfide, 60 ml of 1-ethyl-3-methylimidazole-hexafluorophosphate (EmimPF 6 ) of the round bottom flask was mechanically stirred and ultrasonically assisted to disperse for 8 hours to obtain a molybdenum disulfide-ionic liquid pre-dispersion. The molybdenum disulfide-ionic liquid pre-dispersion is subjected to centrifugation, and the obtained upper layer dispersion is subjected to vacuum filtration to obtain molybdenum disulfide / EmimPF 6 mixture. Determination of molybdenum disulfide / EmimPF by thermogravimetric analyzer 6 EmimPF in the mixture 6 Residual amount of ionic liquid, to molybdenum disulfide / EmimPF 6 Add EmimPF...

Embodiment 2

[0060] Using graphene as a filler and 1-vinyl-3-butylimidazole-bistrifluoromethanesulfonimide salt as a monomer, prepare poly[1-vinyl-3-butylimidazole-bistrifluoromethanesulfonyl imide according to the following steps Methanesulfonylimide salt] / graphene composite gel polymer electrolyte:

[0061] (1) The round-bottomed flask of 0.3 gram of graphene and 60 milliliters of 1-butyl-3-methylimidazole-bistrifluoromethanesulfonimide salt (BmimTFSI) is mechanically stirred and ultrasonically assisted to disperse 8 Hour, obtain graphene-ionic liquid predispersion liquid. The graphene-ionic liquid pre-dispersion liquid is subjected to centrifugation, and the obtained upper layer dispersion liquid is then vacuum-filtered to obtain a graphene / BmimTFSI mixture. Determine the residual amount of BmimTFSI ionic liquid in the graphene / BmimTFSI mixture by thermogravimetric analysis, add BmimTFSI ionic liquid to the graphene / BmimTFSI mixture, and obtain a uniformly dispersed BmimTFSI / graphene d...

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Abstract

The invention belongs to the technical field of polymer electrolytes, and in particular relates to a composite gel polymer electrolyte, its preparation method and its application in lithium batteries. In the present invention, by mixing the ionic liquid / filler dispersion liquid into the ionic liquid monomer, photoinitiator, crosslinking agent, and lithium salt that can undergo polymerization reactions, a composite gel polymer electrolyte precursor with uniformly dispersed fillers is obtained, and then the The precursor is directly in-situ photopolymerized to obtain a composite gel polymer electrolyte with uniformly dispersed fillers, which solves the problem of easy agglomeration of fillers in the polymer matrix and achieves uniform dispersion of fillers in the polymer. At the same time, the composite gel polymer electrolyte is tightly attached to the surface of the battery electrode sheet by in-situ photopolymerization, which significantly improves the interaction between the electrolyte and the electrode sheet interface and improves the cycle stability of the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of polymer electrolytes, and in particular relates to a composite gel polymer electrolyte, its preparation method and its application in lithium batteries. Background technique [0002] Lithium-ion batteries have gradually become the mainstream power source for portable electronic devices due to their high energy density, long cycle life and environmental friendliness. Structurally speaking, a lithium-ion battery consists of positive and negative electrode materials and an electrolyte intermediate layer. The electrolyte layer of the current commercial lithium-ion battery consists of a separator and an electrolyte. Although the electrolyte has high conductivity at room temperature, the flammable solvents that make up the electrolyte pose a great safety hazard. When abnormal conditions such as overcharging and internal short circuit occur in lithium batteries, it is easy to cause the electrolyte to heat up, r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 解孝林夏青叶昀昇石清璇周兴平
Owner HUAZHONG UNIV OF SCI & TECH
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