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Lithium-sulfur battery electrolyte with core-shell structure, and preparation method thereof

A lithium-sulfur battery and electrolyte technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of maintenance, adverse battery safety performance, poor thermal stability and mechanical strength, etc., and achieve cycle stability. and safety improvement, good guiding significance, excellent liquid absorption effect

Inactive Publication Date: 2019-06-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of gel separator also has the problems of poor thermal stability and mechanical strength, which is not conducive to the maintenance of battery safety performance.

Method used

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  • Lithium-sulfur battery electrolyte with core-shell structure, and preparation method thereof
  • Lithium-sulfur battery electrolyte with core-shell structure, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) the aramid fiber emulsion that concentration is 20wt% joins in dimethylacetamide (the ratio of the two volumes is 1: 5) in the organic solvent, utilizes magnetic stirrer to stir 6 hours under normal temperature condition then to form the homogeneous mixing solution, and then drop a certain amount of Oliphobol in the aramid / dimethylacetamide mixture TM 7713) emulsion (ratio by volume is 4:20:1), then the resulting mixed solution was stirred at a high speed for 12 hours at room temperature to form a uniform and stable shell silk solution; the dried 4,4'-diaminodiphenyl Add ether (ODA) to a certain amount of dimethylformamide, then use a magnetic stirrer to stir at room temperature for 1 hour to form a uniformly mixed solution, and then add a certain amount of 1,2,4,5-pyromellitic dianhydride (PMDA), and then the formed mixed solution was stirred at a high speed for 12 hours at room temperature to form a uniform and stable core polyamic acid spinning solution with a m...

Embodiment 2

[0032] (1) the aramid fiber emulsion that concentration is 20wt% joins in dimethylacetamide (the ratio of the two volumes is 1: 5) organic solvent, utilizes magnetic stirrer to stir 6 hours under normal temperature condition then to form the uniform mixing solution, and then drop a certain amount of Oliphobol in the aramid / dimethylacetamide mixture TM 7713) emulsion (ratio by volume is 4:20:1), then the resulting mixed solution was stirred at a high speed for 12 hours at room temperature to form a uniform and stable shell silk solution; the dried 4,4'-diaminodiphenyl Add ether (ODA) to a certain amount of dimethylformamide, then use a magnetic stirrer to stir at room temperature for 1 hour to form a uniformly mixed solution, and then add a certain amount of 1,2,4,5-pyromellitic dianhydride (PMDA), and then the formed mixed solution was stirred at a high speed for 12 hours at room temperature to form a uniform and stable core polyamic acid spinning solution with a mass fractio...

Embodiment 3

[0037] (1) the aramid fiber emulsion that concentration is 20wt% joins in dimethylacetamide (the ratio of the two volumes is 1: 5) in the organic solvent, utilizes magnetic stirrer to stir 6 hours under normal temperature condition then to form the homogeneous mixing solution, and then drop a certain amount of Oliphobol in the aramid / dimethylacetamide mixture TM 7713) emulsion (ratio by volume is 4:20:1), then the resulting mixed solution was stirred at a high speed for 12 hours at room temperature to form a uniform and stable shell silk solution; the dried 4,4'-diaminodiphenyl Add ether (ODA) to a certain amount of dimethylformamide, then use a magnetic stirrer to stir at room temperature for 1 hour to form a uniformly mixed solution, and then add a certain amount of 1,2,4,5-pyromellitic dianhydride (PMDA), and then the formed mixed solution was stirred at a high speed for 12 hours at room temperature to form a uniform and stable core polyamic acid spinning solution with a m...

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Abstract

The invention relates to a preparation method of a lithium-sulfur battery electrolyte. The lithium-sulfur battery electrolyte is composed of a gelled membrane with a core-shell structure ( with the core consisting of polyimide fibers, and the shell consisting of fluorine-doped aramid fibers) and an electrolyte solution. The preparation method comprises the steps of: 1) stirring an aramid fiber emulsion, a dimethylacetamide solvent and oleophobol evenly in proportion to prepare a spinning solution 1, at the same time, mixing 4, 4'-diaminodiphenyl ether and 1, 2, 4, 5-pyromellitic dianhydride uniformly in proportion to form a spinning solution 2; 2) conducting coaxial electrostatic spinning to prepare a polyamide acid@fluorine-doped aramid fiber film, and conducting hot pressing imidizationto obtain a polyimide@fluorine-doped aramid fiber film; and 3) putting the final film into a mixed solution of bis(trifluoromethane sulfonimide) (added with an appropriate amount of nitric acid)-1, 3-dioxolane and 1, 2-dimethoxyethane (in a volume ratio of 1:1), and performing standing for 8h, thus obtaining the polyimide@fluorine-doped aramid fiber polymer electrolyte. The polymer electrolyte prepared according to the invention has the advantages of good lyophilicity, high temperature resistance and high strength, and is conducive to improving the electrochemical and safety performance of lithium-sulfur batteries.

Description

technical field [0001] The invention relates to a lithium-sulfur battery, in particular to a polyimide@fluorine-doped aramid polymer electrolyte for a high-strength gelled lithium-sulfur battery and a preparation method thereof, belonging to the technical field of lithium-sulfur battery diaphragm preparation. Background technique [0002] The emergence of energy crisis and the aggravation of environmental pollution make the development of safe, non-toxic and high specific energy green energy materials particularly necessary. The research and development of lithium-sulfur batteries are in line with this trend. It has the advantages of high specific energy, long cycle life, less environmental pollution, and no memory effect. It is widely used in new energy vehicles, aerospace, and various electric tools. fields are becoming more and more popular. Lithium-sulfur battery separator is a key component of lithium-sulfur batteries, and it is a crucial component that affects the ele...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M2/14H01M2/16D04H1/4382D04H1/728D06C7/00
CPCY02E60/10Y02P70/50
Inventor 康卫民赵慧娟程博闻邓南平杨琪
Owner TIANJIN POLYTECHNIC UNIV
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