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Solid electrolyte and preparation method and application thereof

A solid electrolyte, electrolyte technology, applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve the problems of low electrical conductivity and low mechanical strength of electrolyte, achieve high mechanical strength, improve interface contact, and save time. Effect

Active Publication Date: 2021-02-23
宁德国泰华荣新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a solid electrolyte with high mechanical strength and high ionic conductivity and its preparation method and application for the problems of low mechanical strength and low electrical conductivity of the existing electrolyte

Method used

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  • Solid electrolyte and preparation method and application thereof
  • Solid electrolyte and preparation method and application thereof
  • Solid electrolyte and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] (1) Mix cobalt nitrate hexahydrate, trimesic acid and methanol with a molar ratio of 1:2:520 evenly, immerse the glass fiber in the above solution, shake it on a shaker for 24 hours, and take it out. The shaking temperature is 30°C , a new type of three-dimensional framework was obtained after vacuum drying at 80 °C.

[0052] (2) Weigh lithium bis(trifluoromethylsulfonyl)imide, polyethylene oxide and acetonitrile in a molar ratio of 1:16:0.43, and stir for 24 hours to obtain a uniform sol.

[0053] (3) The prepared new three-dimensional framework was placed on a polytetrafluoroethylene plate, and the above-mentioned sol was scraped on the front and back sides of the new three-dimensional framework. The vinyl plate was peeled off to obtain a solid electrolyte.

Embodiment 2

[0055] The solid electrolyte was produced in the same manner as in Example 1, except that in step (1), the metal salt was cobalt nitrate hexahydrate, the organic ligand was terephthalic acid, the organic solvent I was ethanol, and the molar ratio was 1 : 1.5:300, the shaking temperature is 30°C; in step (2), the lithium salt is lithium tetrafluoroborate, the polymer matrix is ​​polyethylene oxide, the organic solvent II is acetonitrile, and the molar ratio is 1:16:0.43.

Embodiment 3

[0057] The solid electrolyte was produced in the same manner as in Example 1, except that in step (1), the metal salt was tetrabutyl titanate, the organic ligand was 2-amino-terephthalic acid, and the organic solvent I was N , N-dimethylformamide, the molar ratio is 1:1.5:390, and the shaking temperature is 60 °C; in step (2), the lithium salt is lithium trifluoromethanesulfonate, and the polymer matrix is ​​polyvinylidene fluoride-hexa Fluoropropene, the organic solvent II is N-methylpyrrolidone, and the molar ratio is 1:13:0.6.

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Abstract

The invention relates to a solid electrolyte as well as a preparation method and application thereof, and mainly solves the problems of low mechanical strength and low conductivity of the existing solid electrolyte and the problems of complexity, long time consumption and difficulty in large-scale production of the existing solid electrolyte preparation method. According to the solid-state electrolyte, nanoparticles grow on a substrate skeleton, and then the electrolyte is fixed, so that the interface contact between metal lithium and the electrolyte is effectively improved, the ionic conductivity and the ionic migration number are improved, the uniform deposition and separation of lithium ions on the metal lithium are promoted, and the solid-state electrolyte can be widely applied to solid-state batteries.

Description

technical field [0001] The invention relates to an all-solid-state lithium battery, in particular to a solid-state electrolyte and a preparation method and application thereof. Background technique [0002] All-solid-state lithium batteries are designed to fundamentally solve safety problems such as combustion and explosion caused by liquid lithium-ion batteries. Solid polymer electrolytes are considered to be the most promising solid electrolytes for commercial applications due to their flexibility, easy preparation, low cost, and excellent interfacial compatibility with lithium metal. However, the room-temperature ionic conductivity of solid-state polymer electrolytes is low, and the mechanical strength is insufficient to suppress the growth of lithium dendrites. The composite solid electrolytes constructed by adding inorganic fillers to the polymer matrix have been widely studied, and the electrochemical performance is significantly improved compared with pure solid poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/052
CPCH01M10/056H01M10/052H01M2300/0065Y02E60/10
Inventor 王志涛余林颇甘朝伦赵世勇徐凯辰
Owner 宁德国泰华荣新材料有限公司
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