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All-solid-state electrolyte membrane of lithium ion battery and preparation method thereof

A technology of lithium ion battery and electrolyte membrane, applied in the field of all-solid-state lithium battery manufacturing, can solve the problems of low room temperature conductivity, etc., and achieve the effects of high room temperature conductivity, good compatibility and low melting point

Active Publication Date: 2014-03-19
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 in the range of 10-5~10-7S / cm

Method used

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  • All-solid-state electrolyte membrane of lithium ion battery and preparation method thereof
  • All-solid-state electrolyte membrane of lithium ion battery and preparation method thereof
  • All-solid-state electrolyte membrane of lithium ion battery and preparation method thereof

Examples

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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 raise the temperature 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. Dissolve an appropriate amount of lithium salt ultrasonically in diethyl carbonate (DEC) or a mixed solution of DEC / EC, add the completely dissolved lithium salt solution into the polymer colloidal emulsion and stir for 1-6 h.

[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 an organic mixed solvent of ethyl acetate and 1,4-dioxane (400 g) and 23.4 g of ethylene-vinyl acetate copolymer (EVA, Sumitate KC-10, 28wt% vinyl acetate), the mixture was heated to 70 °C and completely dissolved in the solvent under mechanical stirring, and then 93.6 g of acrylonitrile (AN) monomer was added dropwise, and nitrogen gas was introduced for 30 minutes , and then slowly drop 0.49 g of benzoyl peroxide dissolved in 30 mL of toluene solution into 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 20 wt.%, 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 obtaine...

Embodiment 2

[0047] Add an organic mixed solvent of ethyl acetate and 1,4-dioxane (400 g) and 23.4 g of ethylene-vinyl acetate copolymer (EVA, Sumitate KC-10, 28wt% vinyl acetate), the mixture was heated to 70 ℃ and completely dissolved in the solvent under mechanical stirring, and then 187.2g of acrylonitrile (AN) monomer was added dropwise, and nitrogen gas was introduced for 30 minutes , and then slowly drop 0.49 g of benzoyl peroxide dissolved in 30 mL of toluene solution into 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 20 wt.%, 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...

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Abstract

The invention relates to an all-solid-state lithium ion battery diaphragm of a microspheric structure and a preparation method thereof, belongs to the technical field of manufacturing of a lithium battery, and aims at providing a solid polymer electrolyte membrane and a modified all-solid-state polymer electrolyte membrane which are used for solving the bottleneck problem of solid polymer electrolyte, i.e. for improving the room-temperature conductivity of the all-solid-state polymer electrolyte. The spherical granularity of the polymer electrolyte membrane and the modified inorganic / organic composite electrolyte membrane is 100nm to 500nm. The prepared all-solid-state polymer electrolyte membrane is good in heat stability and high in room-temperature conductivity and lithium ion transference number. By virtue of the dry-state polymer electrolyte, the phenomenon that an ordinary liquid battery is likely to burn and explode and the like can be avoided, and the safety reliability of the battery can be improved.

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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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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