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Preparation for self-crosslinking compound solid electrolyte and all-solid lithium ion battery composed of self-crosslinking compound solid electrolyte

A solid-state electrolyte and lithium-ion battery technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, solid electrolytes, etc., can solve the problems of electrolyte mechanical performance deviation, complex preparation process, and influence on electrolyte electrochemical performance, and achieve product shrinkage. Small size, simple preparation process, and good ion conductivity

Active Publication Date: 2018-11-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties of the electrolyte are deviated, and tin salts need to be added as catalysts, which affect the electrochemical properties of the electrolyte, and the preparation process is complicated

Method used

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  • Preparation for self-crosslinking compound solid electrolyte and all-solid lithium ion battery composed of self-crosslinking compound solid electrolyte
  • Preparation for self-crosslinking compound solid electrolyte and all-solid lithium ion battery composed of self-crosslinking compound solid electrolyte
  • Preparation for self-crosslinking compound solid electrolyte and all-solid lithium ion battery composed of self-crosslinking compound solid electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Polypropylene oxide (number-average molecular weight=12000) of 3g terminal silane-terminated polyether, 3g Li 7 La 3 ZrO 12 , 4ml of acetonitrile and 4ml of tetraethylene glycol dimethyl ether were evenly mixed; adding 3g of lithium hexafluorophosphate (LiPF 6 ) mixed evenly; the uniformly stirred mixed solution was scraped onto the polytetrafluoroethylene mold, heated at 60°C for 8 hours in a blast drying oven, and transferred to a vacuum oven at 80°C for curing for 4 hours to form a film.

Embodiment 2

[0034] The polypropylene oxide (number average molecular weight=12000) of 1.5g terminal silane-terminated polyether, the PEO after 1g acid treatment, 2ml propylene carbonate and 30ml tetrahydrofuran are evenly mixed; Add 0.8g lithium hexafluorophosphate (LiPF 6 ) and mix evenly; scrape-coat the mixed solution evenly on the polytetrafluoroethylene mold, heat it at 60°C for 8 hours in a blast drying oven, and transfer it to a vacuum drying oven at 80°C for curing for 4 hours to form a film.

Embodiment 3

[0036] With 2.2g polypropylene oxide (number-average molecular weight=12000) of capped polyether, SiO after 2.8g alkaline treatment 2 Mix evenly with 4ml triethylene glycol dimethyl ether; add 1.4g lithium bistrifluoromethanesulfonylimide (LiTFSI) and mix evenly; scrape the evenly stirred mixed solution on the polytetrafluoroethylene mold, and dry it in the blast Heat at 60°C for 8 hours in the oven, transfer to a vacuum drying oven at 80°C for 4 hours to form a film.

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Abstract

The invention relates to preparation for a self-crosslinking compound solid electrolyte and an all-solid lithium ion battery composed of the self-crosslinking compound solid electrolyte and relates tothe field of the electrolyte of the lithium ion battery. Specifically, a compound solid electrolyte is prepared according to the following steps: adopting silane terminated polyether (MS) as a prepolymer and then stirring and uniformly mixing with inorganic nano-particles with acidity and alkalinity or organic polymer materials, conductive lithium salt and organic solvents, and preparing the compound solid electrolyte through the self-crosslinking curing of MS and inorganic nano-particles with acidity and alkalinity or organic polymer materials. The self-crosslinking compound curing of MS andinorganic nano-particles with acidity and alkalinity or organic polymer materials is capable of reducing the degree of crystallinity of the compound solid electrolyte, promoting the ionic conductivity, ion transference number, mechanical properties, electrochemical stability window and battery rate charge-discharge properties of the compound solid electrolyte and solving the problem of interfacecontact of the solid lithium ion battery. The ionic conductivity can reach up to 10<-4>Scm<-1>, the electrochemical window is above 5V, the shrinking rate of the product is low and the electrochemicalstability is high.

Description

Technical field [0001] The present invention relates to the field of lithium-ion battery electrolytes, in particular to a self-crosslinking composite solid-state electrolyte and an all-solid-state lithium-ion battery composed of it. Background technique [0002] Lithium-ion polymer electrolytes can effectively prevent the formation of metallic lithium dendrites, making it possible to use lithium metal with high energy and high specific power as the negative electrode, greatly improving the electrochemical capacity of lithium-ion batteries. Lithium-ion polymer electrolytes can be shaped into any shape, and can also be made into multi-layered ultra-thin structures and miniaturized, making them easier to assemble with batteries. [0003] In 1973, Wright et al. reported that a mixture of polyethylene oxide (PEO) and electrolyte salts has ionic conductivity. Lithium-ion polymer batteries are mainly characterized by high energy density and good rate capability, easy processing, a...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/058H01M10/0525
CPCH01M10/0525H01M10/056H01M10/058H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 尉海军林志远郭现伟申旭阳
Owner BEIJING UNIV OF TECH
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