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

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Problems solved by technology

The solid electrolyte prepared by this method has relatively low

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

Examples

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Example Embodiment

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

[0023] (1) After mixing the nano-cobalt oxide, trifluoroethylsulfonic acid and PVA aqueous solution, adding heptane as a solvent for heating and stirring to dissolve, to obtain a superhydrophobic pretreatment solution. Wherein, the weight ratio among nano-cobalt oxide, trifluoroethylsulfonic 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, the lithium salt and the ion conductive material, add acetone as a solvent for vacuum stirring, the vacuum degree is -0.1MPa, and pour the slurry into a mold to heat and dry to obtain a solid electrolyte. Wherein, by weight, the content of the polymer matrix is ​​70%-80%, the content of the lithium salt is 10%-20%, and the content of the ion conductive inorganic material is 10%-20%.

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

Example Embodiment

[0027] Example 1:

[0028] (1) After mixing the nano-cobalt oxide, trifluoroethylsulfonic acid and PVA aqueous solution, adding heptane as a solvent, heating and stirring at 40° C. to dissolve, to obtain a superhydrophobic pretreatment solution. Wherein, the weight ratio among nano-cobalt oxide, trifluoroethylsulfonic 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, the lithium salt and the ionic conductive material, add acetone as a solvent for vacuum stirring, the vacuum degree is -0.1MPa, pour the slurry into the mold and heat it at 80°C until the solvent is completely evaporated, 90°C Dry under vacuum for 3 h to obtain a solid electrolyte. Wherein, by weight, the content of the polymer matrix is ​​70%, the content of the lithium salt is 10%, and the content of the ion conductive inorganic material is 20%.

[0030] (3) spraying the solution obtained in step (1) on the surf...

Example Embodiment

[0032] Example 2:

[0033] (1) After mixing nano-cobalt oxide, trifluoroethyl sulfonic acid and PVA aqueous solution, adding heptane as a solvent, heating and stirring at 50° C. to dissolve, to obtain a superhydrophobic pretreatment solution. Wherein, the weight ratio among nano-cobalt oxide, trifluoroethyl sulfonic 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, the lithium salt and the ion conductive material, add acetone as a solvent for vacuum stirring, the vacuum degree is -0.1MPa, pour the slurry into the mold and heat it at 80°C until the solvent is completely evaporated, 100°C Dry under vacuum for 3 h to obtain a solid electrolyte. Wherein, by weight, the content of the polymer matrix is ​​70%, the content of the lithium salt is 15%, and the content of the ion conductive inorganic material is 15%.

[0035] (3) spraying the solution obtained in step (1) on the surface...

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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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