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Preparation method and application of manganese dioxide/polyoxyethylene composite solid electrolyte

A technology of polyethylene oxide and solid electrolyte, applied in solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., to achieve good electrochemical stability, low price, and avoid drying up

Active Publication Date: 2019-12-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Doping manganese dioxide nanosheets into polyethylene oxide to prepare solid electrolytes and applying them to lithium metal batteries has not been reported

Method used

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  • Preparation method and application of manganese dioxide/polyoxyethylene composite solid electrolyte
  • Preparation method and application of manganese dioxide/polyoxyethylene composite solid electrolyte
  • Preparation method and application of manganese dioxide/polyoxyethylene composite solid electrolyte

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Embodiment 1

[0027] Embodiment one, the preparation method of the present embodiment comprises the following steps:

[0028] (1), put 0.5g of manganese dioxide nanosheets into a 500mL round-bottomed flask, add 200mL of acetonitrile to it, put it into an ultrasonic cleaner with a power of 40W, and perform ultrasonication for 6 hours to obtain manganese dioxide-acetonitrile For the dispersion liquid, add 10g of polyethylene oxide (abbreviation: PEO) into the dispersion liquid, and magnetically stir for 1 hour to form a uniformly mixed emulsion; the manganese dioxide nanosheets are nanosheets with a diameter of 20-1000nm and a thickness of 2-100nm;

[0029] (2) Add 1.6 g of lithium bistrifluoromethanesulfonimide (abbreviation: LiTFSI) to the mixed emulsion in step 1, and stir with a magnetic stirrer for 1 hour to obtain a mixed solution;

[0030] (3) Slowly pour the mixed solution prepared in step 2 into a polytetrafluoroethylene mold, place it in a fume hood, and wait for the acetonitrile to...

Embodiment 2

[0036] Embodiment two, the preparation method of the present embodiment comprises the following steps:

[0037] (1), put 0.1g of nano-manganese dioxide into a 500mL round bottom flask, add 300mL of acetonitrile into it, put it into an ultrasonic cleaner with a power of 40W, and perform ultrasonication for 1 hour to obtain a manganese dioxide-acetonitrile dispersion Liquid, add 10g polyethylene oxide (referred to as: PEO) to the dispersion liquid, magnetically stir for 1 hour to form a uniform emulsion; manganese dioxide nanosheets are nanosheets with a diameter of 20-1000nm and a thickness of 2-100nm;

[0038] (2) Add 0.5 g of lithium bistrifluoromethanesulfonimide (abbreviation: LiTFSI) to the mixed emulsion in step 1, and stir with a magnetic stirrer for 1 hour to obtain a mixed solution;

[0039] (3) Slowly pour the mixed solution prepared in step 2 into a polytetrafluoroethylene mold, place it in a fume hood, and wait for the acetonitrile to evaporate to form a polymer sol...

Embodiment 3

[0042] Embodiment three, the preparation method of the present embodiment comprises the following steps:

[0043] (1), put 0.7g of manganese dioxide nanosheets into a 500mL round-bottomed flask, add 250mL of methanol thereinto, put it into an ultrasonic cleaner, and use a power of 40W to perform ultrasonication for 3 hours to obtain manganese dioxide-acetonitrile Dispersion liquid, add 10g polyethylene oxide (referred to as: PEO) to the dispersion liquid, magnetically stir for 1 hour to form a uniformly mixed emulsion;

[0044] (2) Add 2.5 g of lithium bistrifluoromethanesulfonimide (abbreviation: LiTFSI) to the mixed emulsion in step 1, and stir with a magnetic stirrer for 1 hour to obtain a mixed solution;

[0045] (3) Slowly pour the mixed solution prepared in step 2 into a polytetrafluoroethylene mold, place it in a fume hood, and wait for the methanol to evaporate to form a polymer solid electrolyte membrane. Place it in a vacuum drying oven, and dry it in vacuum at 80°C...

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Abstract

The invention discloses a preparation method and application of a manganese dioxide / polyoxyethylene solid electrolyte, and the preparation method comprises the following steps: (1) adding acetonitrileinto a manganese dioxide nanosheet, performing ultrasonic cleaning to obtain manganese dioxide-acetonitrile dispersion liquid, adding polyoxyethylene PEO, and performing stirring to obtain a uniformemulsion; (2) adding lithium bis(trifluoromethanesulfonyl) imide LiTFSI into the emulsion, and performing stirring to obtain a uniform mixed solution; (3) pouring the mixed solution into a polytetrafluoroethylene mold, performing ventilating and evaporating of a drying box, cutting the prepared polymer solid electrolyte into wafers, and applying the wafers to a solid-state lithium metal battery. According to the invention, the transference number of lithium ions and the ionic conductivity of the polymer solid electrolyte are improved, the problems of drying and liquid leakage of an organic liquid battery are effectively avoided in the process of assembling the solid lithium metal battery, the encapsulation performance of the lithium metal battery is improved, and the good electrochemical cycling stability and safety are maintained.

Description

technical field [0001] The invention belongs to the technical field of solid electrolyte preparation, in particular to a preparation method and application of a manganese dioxide / polyoxyethylene composite solid electrolyte. Background technique [0002] Electric vehicles, electronic mobile devices, etc. have very high requirements for high-energy-density power supplies, and the energy density of existing lithium-ion batteries still cannot meet the needs of these applications. Lithium metal battery is an energy storage system with great potential based on its own high specific capacity (3860mAh g -1 ) and lower reduction potential (-3.04 V vs. reversible hydrogen electrode potential). The commonly used electrolyte is still the traditional ester organic liquid electrolyte. Therefore, when lithium metal batteries work at high temperatures, leakage, dryness, and flammability and explosion are still serious safety issues. For the above reasons, all-solid-state batteries that c...

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 丁书江李宇寒孙宗杰朱敏
Owner XI AN JIAOTONG UNIV
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