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Polymer electrolyte based on fluorine-containing polyimide and its preparation method and application

A polyimide and polymer technology, which is applied in the field of new fluorine-containing polyimide polymer electrolyte and its preparation, can solve the problems of not significantly improving the safety of lithium-ion batteries, and achieve improved dielectric properties and Solubility, poor heat resistance, low and high temperature heat shrinkage effect

Active Publication Date: 2019-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned documents only improve the performance of the diaphragm or electrolyte, but do not significantly improve the safety of lithium-ion batteries

Method used

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  • Polymer electrolyte based on fluorine-containing polyimide and its preparation method and application
  • Polymer electrolyte based on fluorine-containing polyimide and its preparation method and application
  • Polymer electrolyte based on fluorine-containing polyimide and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1.3045g 4,4'-[1,4-phenylbis(oxygen)]bis[3-(trifluoromethyl)aniline], 0.9441g3,3',4,4'-diphenyl ether tetracarboxylic dianhydride Mix evenly with 15ml m-cresol to form a solution with a solid content of 15%, add 0.1wt.% isoquinoline as a catalyst for the reaction, and react at 30°C for 4h; add 15ml of toluene as a water-carrying agent, The reaction was carried out at ℃ for 18 hours to obtain a trifluoromethyl polyimide solution, which was slowly added to ethanol to extract the crude product polyimide, and the crude product polyimide was vacuum-dried at 110 ℃ for 8 hours to obtain a new type of polyimide based on Fluorine-containing polyimides and polyimides used in polymer electrolytes of nano-fluids; weigh 55.6018g of 3-chloropropyltrimethoxysilane and 28.6770g of methylimidazole and react with magnetic stirring at 80°C for 72h to obtain imidazole quaternary Ammonium salt, weigh 5.2790g of imidazole quaternary ammonium salt and 22.0731g of polyethylene glycol-4-nonylphe...

Embodiment 2

[0049] 1.3045g 4,4'-[1,4-phenylbis(oxygen)]bis[3-(trifluoromethyl)aniline], 0.9441g3,3',4,4'-diphenyl ether tetracarboxylic dianhydride Mix evenly with 15ml m-cresol to form a solution with a solid content of 15%, add 0.1wt.% isoquinoline as a catalyst for the reaction, and react at 30°C for 4h; add 15ml of toluene as a water-carrying agent, The reaction was carried out at ℃ for 18 hours to obtain a polyimide solution containing trifluoromethyl, which was slowly added to ethanol to extract the crude product polyimide, and the crude product polyimide was dried in vacuum at 110 ℃ for 8 hours to obtain a preparation based on Polyimide used in polymer electrolytes of fluoropolyimides and nano-fluids; Weigh 0.662g of epoxy silane modifier and dissolve it in 40ml of ethanol solvent, add to 1.667g of 30wt with an average nanometer particle size of 7nm .% nano-silica aqueous solution, add 30ml of water, stir and react at 70°C for 24 hours to obtain active nano-silica, add 0.519g tri-n...

Embodiment 3

[0054] 1.3045g 4,4'-[1,4-phenylbis(oxygen)]bis[3-(trifluoromethyl)aniline], 0.9441g3,3',4,4'-diphenyl ether tetracarboxylic dianhydride Mix evenly with 15ml m-cresol to form a solution with a solid content of 15%, add 0.1wt.% isoquinoline as a catalyst for the reaction, and react at 30°C for 4h; add 15ml of toluene as a water-carrying agent, The reaction was carried out at ℃ for 18 hours to obtain a trifluoromethyl polyimide solution, which was slowly added to ethanol to extract the crude product polyimide, and the crude product polyimide was vacuum-dried at 110 ℃ for 8 hours to obtain a new type of polyimide based on Polyimide used in polymer electrolytes of fluorine-containing polyimides and nano-fluids; weigh 35ml of methylimidazole, 30ml of chloroethanol and 300ml of ethyl acetate, mix them, stir and react at 100°C for 48h, and cool to room temperature After separation, the lower layer liquid was obtained and vacuum-dried at 100°C for 12 hours to obtain 1-hydroxyethyl-3-me...

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Abstract

The invention discloses fluorine-containing polyimide polymer electrolyte as well as a preparation method and an application thereof. According to the preparation method, fluorine-containing polyimide obtained through polymerization of organic dicarboxylic anhydrides and organic diamine is dissolved in N,N-dimethylacetamide, lithium salt and liquidlike fluids are added at the room temperature, the mixture is stirred uniformly, and a solution with the solid content being 5%-35% by mass is prepared; a homogeneous membrane with the thickness of 10 mu m-1 mm is prepared from the solution, and the fluorine-containing polyimide polymer electrolyte is obtained. The liquidlike fluids are added, so that the ionic conductivity is greatly improved, and polyimide which is difficult to be compatible with the lithium salt can be compounded. The prepared polymer electrolyte has the ionic conductivity far higher than that of a conventional lithium-ion battery separator and exceeding 10<-3> S / cm, has the heat-resistance temperature exceeding 300 DEG C, has very low high-temperature heat shrinkage rate and high mechanical strength and well meets the safety requirements of the polymer electrolyte.

Description

technical field [0001] The invention relates to fluorine-containing polyimide polymers, in particular to a novel fluorine-containing polyimide-based polymer electrolyte and its preparation method and application; it belongs to polymer electrolyte technology. Background technique [0002] Polymer electrolytes, also known as ion-conducting polymers, have a wide range of applications in electronics, medical care, space technology, electrochromism, optoelectronics, and sensors. Because of its light weight, good film-forming properties, good viscoelasticity and stability, and many other incomparable properties of inorganic electrolytes and organic solvent electrolytes, it has applications in batteries, electrolyzed water, organic electrosynthesis, chemical sensors and other fields. Due to the absence of solution voltage drop and the selective separation of ionic membranes, polymer electrolytes have high energy efficiency and are widely used in hydrogen-oxygen fuel cells, methanol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 邱志明谭旭严玉蓉何厚刚
Owner SOUTH CHINA UNIV OF TECH
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