Preparation and application of an organic-inorganic composite solid electrolyte

A solid electrolyte and inorganic composite technology, applied in solid electrolyte, non-aqueous electrolyte, circuit, etc., can solve the problems of low conductivity, difficult room temperature batteries, etc., to improve thermal stability, ion conductivity, and charge and discharge performance Effect

Active Publication Date: 2020-09-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most polymer electrolytes have low room temperature ionic conductivity, which makes it difficult to be used in room temperature batteries.

Method used

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  • Preparation and application of an organic-inorganic composite solid electrolyte
  • Preparation and application of an organic-inorganic composite solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix and stir 2.8g HDI trimer, 0.5PEG (Mw=1000), 2.8g nano-alumina, 4ml acetonitrile and tetraethylene glycol dimethyl ether (TEGDME) (V:V=1:1); add 1g lithium hexafluorophosphate ( LiPF 6 ) mixed evenly to prepare a transparent and clear electrolyte; dropwise add 0.1g dibutyltin dilaurate and stir evenly; scrape the evenly stirred composite polymer electrolyte onto a polytetrafluoroethylene mold, and heat it to 60°C in a glove box , Cured for 12 hours to form a film.

Embodiment 2

[0032] 2.2g HDI trimer, 0.5PEG (Mw=1500), 2g Li 10 GeP 2 S 12 , 4ml tetraethylene glycol dimethyl ether (TEGDME) and 1-methyl-2 pyrrolidone (V:V=1:1) are evenly mixed and stirred; add 0.8gLiN(C 2 f 5 SO 2 ) 2 Mix evenly to prepare a transparent and clear electrolyte; dropwise add 0.12g of dibutyltin dilaurate and stir evenly; scrape the evenly stirred composite polymer electrolyte onto a polytetrafluoroethylene mold, heat it to 60°C in a glove box, and cure 12 hours film formation.

Embodiment 3

[0034] 2.5g HDI, 4g EG, 1g Li 10 GeP 2 S 12 Mix and stir evenly with 2ml tetraethylene glycol dimethyl ether; add 2g LiBOB and mix evenly to prepare a transparent and clear electrolyte; dropwise add 0.06g bis(acetylacetonate) dibutyltin and stir evenly; scrape the evenly stirred composite polymer electrolyte Put it on a polytetrafluoroethylene mold, heat it to 60°C in a glove box, and cure it for 12 hours to form a film.

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Abstract

The invention relates to preparation and application of an organic-inorganic composite solid-state electrolyte, and relates to the technical field of a lithium ion battery electrolyte. The organic-inorganic composite solid-state electrolyte is prepared by selecting an isocyanate compound having rigid characteristic, a flexible chain segment compound capable of complexing and dissociating with lithium ions, inorganic nanoparticles, a conductive lithium salt and an organic solvent and adding a tin catalyst for crosslinking and curing. With the isocyanate compound, the mechanical property and thethermal stability of the composite solid-state electrolyte can be improved; by the flexible chain segment compound and the inorganic nanoparticles, the ion conductivity, the ion transfer number and the wide electrochemical window of the composite solid-state electrolyte can be improved, the charge-discharge performance of the lithium ion battery is improved, and the interface contact of the solid-state lithium ion battery is improved; and the organic-inorganic composite solid-state electrolyte has the advantages of excellent interface stability, wide electrochemical window, wide working temperature range, high ion conductivity and versatile shapes and is applicable to a lithium ion polymer battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to the preparation and application of an organic-inorganic composite solid-state electrolyte. Background technique [0002] Lithium-ion batteries have been widely used in consumer electronics and communication fields due to many advantages such as high energy density, high working voltage, long cycle life, no memory effect, fast charge and discharge, and environmental friendliness. At present, commercial lithium-ion batteries generally use organic liquid electrolytes and gel electrolytes. These two electrolytes have high ionic conductivity. Serious safety hazard. The use of solid electrolytes to replace traditional organic liquid electrolytes and gel electrolytes is considered to be an effective way to solve the above problems. In addition to high safety performance, solid electrolytes also have the advantages of wide electrochemical stability window (up t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 尉海军侯文茹郭现伟林志远
Owner BEIJING UNIV OF TECH
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