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Super-hydrophobic solid electrolyte of lithium-air battery and preparation method thereof

A solid-state electrolyte and lithium-air battery technology, which is applied in electrolytes, secondary batteries, fuel cell half-cells and secondary battery-type half-cells, can solve the problems of poor rate performance, low ionic conductivity of solid electrolytes, battery Short cycle time and other issues, to achieve the effect of good high temperature resistance, good ionic conductivity, excellent hydrophobic performance

Active Publication Date: 2020-06-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid electrolyte prepared by this method has relatively low ionic conductivity, short battery cycle and poor rate performance.

Method used

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  • Super-hydrophobic solid electrolyte of lithium-air battery and preparation method thereof
  • Super-hydrophobic solid electrolyte of lithium-air battery and preparation method thereof
  • Super-hydrophobic solid electrolyte of lithium-air battery and preparation method thereof

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preparation example Construction

[0022] The preparation method of described superhydrophobic electrolyte comprises the following steps:

[0023] (1) After mixing nano-cobalt oxide, trifluoroethanesulfonic acid and PVA aqueous solution, add heptane as a solvent to heat, stir and dissolve to obtain a superhydrophobic pretreatment solution. Wherein, the weight proportion among nano cobalt oxide, trifluoroethanesulfonic acid, PVA aqueous solution and heptane is 1:3-5:7-9:8-10, and the mass fraction of PVA aqueous solution is 5%.

[0024] (2) After mixing the polymer matrix, lithium salt and ion-conducting material, add acetone as a solvent and stir in vacuum with a vacuum degree of -0.1MPa. After the slurry is obtained, pour it into a mold for heating and drying to obtain a solid electrolyte. Wherein, by weight, the polymer matrix content is 70%-80%, the lithium salt content is 10%-20%, and the ion-conducting inorganic material content is 10%-20%.

[0025] (3) Spraying the solution obtained in step (1) onto the ...

Embodiment 1

[0028] (1) After mixing nano-cobalt oxide, trifluoroethanesulfonic acid and PVA aqueous solution, heptane was added as a solvent and heated and stirred at 40° C. to dissolve to obtain a super-hydrophobic pretreatment solution. Wherein, the weight proportion among nano-cobalt oxide, trifluoroethanesulfonic acid, PVA aqueous solution and heptane is 1:3:7:8, and the mass fraction of PVA aqueous solution is 5%.

[0029] (2) After mixing the polymer matrix, lithium salt and ion-conducting material, add acetone as a solvent and stir in vacuum with a vacuum degree of -0.1MPa. After the slurry is obtained, pour it into a mold and heat it at 80°C until the solvent is completely evaporated. Dry under vacuum for 3 hours to obtain a solid electrolyte. Wherein, by weight, the polymer matrix content is 70%, the lithium salt content is 10%, and the ion-conducting inorganic material content is 20%.

[0030] (3) Spray the solution obtained in step (1) onto the surface of the solid electrolyte...

Embodiment 2

[0033] (1) After mixing nano-cobalt oxide, trifluoroethanesulfonic acid and PVA aqueous solution, heptane was added as a solvent and heated and stirred at 50° C. to dissolve to obtain a super-hydrophobic pretreatment solution. Wherein, the weight proportion among nano cobalt oxide, trifluoroethanesulfonic acid, PVA aqueous solution and heptane is 1:4:8:9, and the mass fraction of PVA aqueous solution is 5%.

[0034] (2) After mixing the polymer matrix, lithium salt and ion-conducting material, add acetone as a solvent and stir in vacuum with a vacuum degree of -0.1MPa. After the slurry is obtained, pour it into a mold and heat it at 80°C until the solvent is completely evaporated. Dry under vacuum for 3 hours to obtain a solid electrolyte. Wherein, by weight, the polymer matrix content is 70%, the lithium salt content is 15%, and the ion-conducting inorganic material content is 15%.

[0035] (3) Spray the solution obtained in step (1) onto the surface of the solid electrolyte...

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Abstract

The invention relates to the technical field of solid-state batteries, in particular to a super-hydrophobic solid-state electrolyte of a lithium-air battery and a preparation method thereof. The super-hydrophobic solid electrolyte is composed of a super-hydrophobic material and a solid electrolyte, and the super-hydrophobic material is sprayed on the surface of the solid electrolyte. The super-hydrophobic material is obtained by the following steps: mixing nano cobalt oxide, trifluoroethyl sulfonic acid and a PVA aqueous solution, adding heptane as a solvent, performing heating, stirring and dissolving to obtain a super-hydrophobic pretreatment solution, and spraying the super-hydrophobic pretreatment solution on the surface of a solid electrolyte, wherein the material of the solid electrolyte is composed of a polymer matrix, a lithium salt and an ionic conductive inorganic material; mixing the polymer matrix, a lithium salt and an ionic conductive inorganic material, adding acetone asa solvent, performing stirring in vacuum, pouring the mixture into a mold, and performing heating and drying in vacuum to obtain the solid electrolyte.

Description

technical field [0001] The invention relates to the technical field of solid-state batteries, in particular to a super-hydrophobic solid-state electrolyte for a lithium-air battery and a preparation method thereof. Background technique [0002] At present, in the field of pure electric vehicles, in order to meet the demand for high energy density of power batteries, researchers from various countries have invested a lot of research on lithium-air batteries. During battery discharge, the discharge product Li 2 o 2 , stored in the positive channel; when charging, the discharge product decomposes. Since the lithium-air battery is a semi-open system, when the battery is in a relatively humid environment, the H 2 O enters from the positive electrode to the lithium negative electrode of the battery, resulting in the formation of by-products such as LiOH on the surface of the metal Li. These by-products may lead to the formation of lithium dendrites, deteriorating the safety of ...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M12/08H01M10/42B82Y40/00B82Y30/00
CPCH01M10/056H01M12/08H01M10/4235B82Y30/00B82Y40/00H01M2300/0094Y02E60/10
Inventor 王楠韩贞毅唐玲玲
Owner JIANGSU UNIV
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