Electrolyte membrane for all-solid-state lithium-ion battery and preparation method thereof

A lithium-ion battery and electrolyte membrane technology, which is applied in the field of all-solid-state lithium battery manufacturing, can solve the problem of low room temperature conductivity and achieve high room temperature conductivity, high lithium ion migration number, and good compatibility.

Active Publication Date: 2016-02-03
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently developed all-solid polymer electrolytes generally have the defect of low room temperature conductivity, most of which are below 10 -5 ~10 -7 S / cm

Method used

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  • Electrolyte membrane for all-solid-state lithium-ion battery and preparation method thereof
  • Electrolyte membrane for all-solid-state lithium-ion battery and preparation method thereof
  • Electrolyte membrane for all-solid-state lithium-ion battery and preparation method thereof

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preparation example Construction

[0037] a. Preparation of polymer electrolyte colloidal emulsion

[0038] First dissolve EVA in an organic solvent, add acrylonitrile monomer to the EVA solution and heat up to 70-80°C; then dropwise add the solution containing the initiator benzoyl peroxide to polymerize for 2-5 hours, add VEC to further Polymer colloid liquid is obtained after polymerization for 6-24 hours. An appropriate amount of lithium salt is ultrasonically dissolved in diethyl carbonate (DEC) or a mixed solution of DEC / EC, and the completely dissolved lithium salt solution is added to the polymer colloidal emulsion and stirred for 1-6 hours.

[0039] b. Preparation of composite polymer electrolyte emulsion modified by inorganic nanofillers

[0040] The polymer colloid liquid obtained in step a is mechanically stirred and mixed with the polymer colloid liquid of uniformly dispersed nano-inorganic fillers by ball milling for 2-8 hours to obtain a modified inorganic / organic composite electrolyte emulsion....

Embodiment 1

[0044] Add ethyl acetate and 1,4-dioxane organic mixed solvent (400g) and 23.4g ethylene-vinyl acetate copolymer (EVA, SumitateKC -10, 28wt% vinyl acetate), the mixture was heated to 70°C and completely dissolved in the solvent under mechanical stirring, then 93.6g of acrylonitrile (AN) monomer was added dropwise, and nitrogen gas was introduced for 30 minutes, and then The 30 mL toluene solution dissolved with 0.49 g of benzoyl peroxide was slowly added dropwise to the reaction system. After the dropwise addition, react for about 1 hour, and then add vinyl ethylene acetate (VEC, 46.8g) dropwise after the reactant turns into a light yellow emulsion. After 8 hours of reaction, P(AN -co- VEC) / EVA polymer emulsion. In this reaction system, the conversion rate of AN is above 85%, the solid content is about 20wt.%, the particle size of the polymer microspheres is 100-500nm, and the particle size of the latex is controlled by the polymerization reaction conditions. The obtained co...

Embodiment 2

[0047] Add ethyl acetate and 1,4-dioxane organic mixed solvent (400g) and 23.4g ethylene-vinyl acetate copolymer (EVA, SumitateKC -10, 28wt% vinyl acetate), the mixture was heated to 70°C and completely dissolved in the solvent under mechanical stirring, then 187.2g of acrylonitrile (AN) monomer was added dropwise, and nitrogen gas was introduced for 30 minutes, and then The 30 mL toluene solution dissolved with 0.49 g of benzoyl peroxide was slowly added dropwise to the reaction system. After the dropwise addition, react for about 1 hour, and then add vinyl ethylene acetate (VEC, 50.4g) dropwise after the reactant turns into a light yellow emulsion. After 8 hours of reaction, P(AN -co- VEC) / EVA polymer emulsion. In this reaction system, the conversion rate of AN is above 85%, the solid content is about 20wt.%, the particle size of the polymer microspheres is 100-200nm, and the particle size of the latex is controlled by the polymerization reaction conditions. The obtained c...

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Abstract

The invention relates to an all-solid-state lithium-ion battery diaphragm with a microspherical structure and a preparation method thereof, belonging to the technical field of lithium battery manufacturing. The technical problem to be solved by the present invention is to solve the bottleneck problem faced by solid polymer electrolytes, that is, to improve the room temperature conductivity of all solid polymer electrolytes, and to provide a solid polymer electrolyte membrane with a spherical structure and a modified all solid polymer electrolyte. electrolyte membrane. The spherical particle diameter of the polymer electrolyte membrane and the modified inorganic / organic composite electrolyte membrane is 100-500nm. The all-solid polymer electrolyte membrane prepared by the present invention has good thermal stability, high room temperature conductivity and lithium ion migration number, and this dry polymer electrolyte can avoid common liquid batteries from being easy to burn, explode, etc., and improves the safety of the battery reliability.

Description

technical field [0001] The invention relates to the technical field of all-solid-state lithium battery manufacturing, in particular to an electrolyte diaphragm material used for energy storage devices such as lithium (ion) secondary all-solid-state batteries and a preparation method thereof. Background technique [0002] Despite its great commercial success, liquid lithium-ion batteries suffer from several serious drawbacks. First of all, because liquid lithium-ion batteries contain liquid electrolytes, the packaging of the shell is relatively limited; second, the liquid electrolytes used in liquid lithium-ion batteries are extremely flammable. If the battery valve is opened and the liquid electrolyte overflows, the discharged liquid electrolyte may burn. This is the biggest safety hazard in consumer electronics; in addition, liquid lithium-ion batteries have significant size limitations for both large and small batteries. [0003] Polymer lithium-ion batteries are a new di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/058
CPCC08F220/44H01M10/0565C08F218/12Y02E60/10Y02P70/50
Inventor 黄兴兰王睿谢皎阮晓莉王荣贵
Owner DONGFANG ELECTRIC CORP LTD
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