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Preparation method and application of boron nitride/polyoxyethylene composite solid electrolyte

A solid electrolyte, polyethylene oxide technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problem of not using lithium metal batteries, and achieve the effect of uniform solid electrolyte membrane, mild conditions, and good encapsulation.

Inactive Publication Date: 2019-05-14
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2017, Bingqing Wei published a paper in the journal Electrochimica Acta, reporting that hexagonal boron nitride nanosheets were doped with polyvinyl alcohol-sulfuric acid to prepare a gel electrolyte and apply it to supercapacitors, but not to lithium metal batteries.

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  • Preparation method and application of boron nitride/polyoxyethylene composite solid electrolyte
  • Preparation method and application of boron nitride/polyoxyethylene composite solid electrolyte
  • Preparation method and application of boron nitride/polyoxyethylene composite solid electrolyte

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Embodiment 1

[0029] The preparation method of the present embodiment comprises the following steps:

[0030] (1) Put 0.6g of nano-boron nitride into a 500mL round bottom flask, add 200mL of acetonitrile into it, put it into an ultrasonic cleaner with a power of 40W, and perform ultrasonication for 6 hours to obtain a boron nitride-acetonitrile dispersion , add 10g of polyethylene oxide (referred to as: PEO) in the dispersion, magnetically stirred for 1 hour to form a uniformly mixed emulsion; nano-boron nitride is a nano-sheet with a diameter of 50-1000nm and a thickness of 10-100nm;

[0031] (2) Add 1 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;

[0032] (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 solid electrolyte membrane. Place i...

Embodiment 2

[0039] The preparation method of the present embodiment comprises the following steps:

[0040] (1) Put 0.3g of nano-boron nitride into a 500mL round-bottomed 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 boron nitride-acetonitrile dispersion , add 10g of polyethylene oxide (referred to as: PEO) in the dispersion, magnetically stirred for 1 hour to form a uniformly mixed emulsion; nano-boron nitride is a nano-sheet with a diameter of 50-1000nm and a thickness of 10-100nm;

[0041] (2) Add 0.7 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;

[0042] (3) Slowly pour the mixed solution prepared in step 2 into a polytetrafluoroethylene mold, place it in a fume hood, wait for the acetonitrile to evaporate, and form a polymer solid electrolyte membrane; place i...

Embodiment 3

[0046] The preparation method of the present embodiment comprises the following steps:

[0047] (1) Put 0.9g of nano-boron nitride into a 500mL round bottom flask, add 250mL of methanol into it, put it into an ultrasonic cleaner with a power of 40W, and perform ultrasonication for 3 hours to obtain a boron nitride-acetonitrile dispersion , add 10g polyethylene oxide (referred to as: PEO) to the dispersion liquid, magnetically stir for 1 hour to form a uniformly mixed emulsion; nano-boron nitride is boron nitride in the form of an array with a diameter range of 10-30 μm and a thickness of 0.1-1 μm;

[0048] (2) Add 1.5 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;

[0049] (3) Slowly pour the mixed solution prepared in step 2 into a polytetrafluoroethylene mold, place it in a fume hood, wait for the methanol to evaporate, and form a polymer solid electro...

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Abstract

Disclosed are a preparation method and an application of a boron nitride / polyoxyethylene composite solid electrolyte. (1) Acetonitrile is added into nanometer boron nitride, and ultrasonic cleaning iscarried out to obtain a boron nitride-acetonitrile dispersing liquid, and then polyoxyethylene PEO is added and stirred into uniform emulsion; (2) LiTFSI is added into the emulsion and is stirred into a uniform mixed solution; and (3) the mixed solution is poured into a polytetrafluoroethylene mold, and passes through a ventilation and evaporation drying box, and then a prepared polymer solid electrolyte is cut into circular pieces to be applied to a solid lithium metal battery, wherein the binder adopted in the solid lithium metal battery is polyoxyethylene PEO. The mechanical property of the polymer solid electrolyte is improved, and the lithium ion transport number is increased; and in the assembling process of the solid lithium metal battery, the problems of drying and liquid leakageof an organic liquid battery are effectively avoided, and high electrochemical cycling stability and safety are kept.

Description

technical field [0001] The invention belongs to the technical field of solid-state electrolyte preparation, and in particular relates to a preparation method and application of a boron nitride / polyoxyethylene composite solid-state electrolyte. Background technique [0002] Today's electronic devices have very high requirements for high-energy-density power supply systems, but 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). However, at present, lithium-ion batteries still use traditional ester organic liquid electrolytes, which are commonly used electrolytes in lithium-ion batteries. However, when working at high temperatures, leakage, drying up, and flammability and explosion are still serious safety issues. F...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCY02E60/10
Inventor 丁书江李宇寒孙宗杰朱敏
Owner XI AN JIAOTONG UNIV
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