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An organic-inorganic composite solid-state electrolyte and its preparation method and application

A solid electrolyte and inorganic composite technology, applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of uneven distribution, easy agglomeration of inorganic particles, waste, etc., and achieve high lithium ion migration number and inhibited growth. , the effect of high conductivity

Active Publication Date: 2021-03-23
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrolyte membrane obtained in this patent has good flexibility and high conductivity, but because the inorganic solid electrolyte particles are easy to agglomerate, they are unevenly distributed in the organic phase, and cannot form effective lithium ion fast transmission channels, resulting in waste
CN108878959A discloses the preparation and application of an organic-inorganic composite solid electrolyte; it selects isocyanate compounds with rigid characteristics, soft segment compounds that can complex and dissociate with lithium ions, inorganic nanoparticles, conductive lithium salts, and organic solvents , the organic-inorganic composite solid electrolyte is prepared by adding tin catalysts to cross-link and solidify. The solid electrolyte obtained in this patent has excellent interface stability and high ionic conductivity, but also has the defect that inorganic particles are easy to agglomerate

Method used

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  • An organic-inorganic composite solid-state electrolyte and its preparation method and application

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Embodiment 1

[0055] An organic-inorganic composite solid-state electrolyte membrane, the preparation method of which is as follows:

[0056] (1) Add 0.015g SiO 2 Dissolve 1g of polyethylene glycol with a molar mass of 1000g / mol in 6g of acetonitrile solution, slowly add 0.0676g of 3-chloropropyltrimethoxysilane solution dropwise, heat to 60°C under continuous stirring and keep it warm for 24h , the stirring rate was 700r / min, and the heating rate was 10°C / min to obtain solution A;

[0057] (2) Add 0.5 g of polyethylene oxide with a molar mass of 900,000 g / mol and 0.5438 g of LiTFSI to solution A, and continue stirring at room temperature for 24 hours at a stirring rate of 700 r / min to obtain slurry B;

[0058] (3) Use a 400 μm scraper to evenly coat the slurry B on a polytetrafluoroethylene flat plate, and then dry it at room temperature and 50° C. for 48 hours to obtain an organic-inorganic composite solid electrolyte membrane.

Embodiment 2-6

[0060] The only difference with Example 1 is that in this example, the amount of polyethylene oxide added is replaced by 0.2g (Example 2), 2g (Example 3), 5g (Example 4), 0.1g (Example 4). Example 5), 6g (embodiment 6).

Embodiment 7-8

[0062] The only difference with Example 1 is that in this example, the addition of silane coupling agent is 0.1987g (molar ratio with polyethylene glycol is 1:1, Example 7), 0.0397g (1:5 , embodiment 8).

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Abstract

The invention provides an organic-inorganic composite solid-state electrolyte and its preparation method and application, comprising the following components: an inorganic solid-state electrolyte, a polymer, a lithium salt and a silane coupling agent. The organic-inorganic composite solid electrolyte provided by the invention has the advantages of high electrical conductivity, low activation energy, and large lithium ion migration number, can effectively inhibit the growth of lithium dendrites, and exhibits high capacity and long life in lithium metal batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to an organic-inorganic composite solid electrolyte and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become an indispensable energy storage device in people's production and life. Whether it is electronic equipment or transportation, they have a very wide range of applications. Traditional commercial lithium-ion batteries have potential safety hazards due to the use of flammable organic liquid electrolytes. Compared with traditional lithium-ion batteries, all-solid-state lithium-ion batteries have longer cycle life, higher energy density, and simpler assembly processes, especially replacing flammable organic electrolytes with non-flammable solid-state electrolytes. With higher safety, all-solid-state lithium-ion batteries have received more and more attention. [0003] The core of all solid-state lithium-ion batteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/0525
CPCH01M10/0525H01M10/056H01M10/058H01M2300/0091Y02E60/10Y02P70/50
Inventor 张锁江潘科成张兰
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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