Composite solid polymer electrolyte membrane and preparation method and application thereof

A solid polymer, electrolyte membrane technology, applied in the field of electrochemical devices

Inactive Publication Date: 2020-08-14
CHINA LUCKY FILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing solid polymer electrolytes still need to be improved

Method used

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  • Composite solid polymer electrolyte membrane and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Polyethylene oxide (PEO), a lithium-ion-conducting polymer, is dissolved in an acetonitrile solution at a concentration of 8%, and a cross-linking monomer trimethylolpropane triglycidyl ether (TMPEG) and polyether with 100% of the mass of PEO are added Amine (ED900), under stirring, add N-methyl-butylpyrrolidine bistrifluoromethanesulfonic acid imide salt ionic liquid with 50% PEO mass, and finally add lithium salt LiTFSI, the addition ratio is the same as that of polymer and monomer The molar ratio of EO groups in the medium is 1:5; after mixing evenly, the solid polymer electrolyte slurry is coated on the release film, heated at 80°C, the monomers in the material are cross-linked, the solvent volatilizes, and a composite solid-state polymerization is obtained electrolyte membrane.

Embodiment 2

[0049] Polyethylene oxide (PEO), a lithium-ion-conducting polymer, was dissolved in an acetonitrile solution at a concentration of 8%, and the cross-linking monomer polypropylene glycol diglycidyl ether (DY-3601) and polyether amine with 100% of the mass of PEO were added (ED900), under stirring, add N-methyl-butylpyrrolidine bistrifluoromethanesulfonic acid imide salt ionic liquid with 50% PEO mass, and finally add lithium salt LiTFSI, and the addition ratio is the same as that in the polymer and the monomer The molar ratio of EO groups is 1:5; after mixing evenly, coat the solid polymer electrolyte slurry on the release film, heat at 100°C, cross-link the monomers in the material, and volatilize the solvent to obtain a composite solid polymer electrolyte membrane.

Embodiment 3

[0051] Polyethylene oxide (PEO), a lithium-ion-conducting polymer, was dissolved in an acetonitrile solution at a concentration of 8%, and gas-phase nano-silica (average particle size: 10nm) with a mass of 20% of PEO was added for uniform ultrasonic dispersion. Then add 100% PEO mass of cross-linking monomer trimethylolpropane triglycidyl ether (TMPEG) and polyether amine (ED900), and add N-methyl-butylpyrrolidine bistriol with 50% PEO mass Fluoromethanesulfonate imide salt ionic liquid, finally add lithium salt LiTFSI, the addition ratio is 1:5 with the molar ratio of EO groups in the polymer and the monomer; after mixing evenly, coat the solid polymer electrolyte slurry on On the release film, heating at 80°C, the monomers in the material are cross-linked, the solvent is volatilized, and a composite solid polymer electrolyte membrane is obtained.

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Abstract

The invention discloses a composite solid polymer electrolyte membrane as well as a preparation method and application thereof. The composite solid polymer electrolyte membrane comprises a polymer component, a lithium salt, 0-25 parts by mass of a plasticizer, and 0-15 parts by mass of inorganic particles, wherein the polymer component comprises 10-30 parts by mass of a thermoplastic polymer and 20-50 parts by mass of a cross-linked network polymer, and the molar ratio of the lithium salt to lithium ion complexing dissociation groups in the polymer component is 1:(1-16). The composite solid polymer electrolyte membrane has high ionic conductivity and good mechanical strength, the preparation process is simple, and the composite solid polymer electrolyte membrane can be applied to large-scale production. In some embodiments of the present invention, the thickness of the composite solid polymer electrolyte membrane is 10-500 [mu]m, the tensile strength is 0.2 MPa or above, the lithium-ion conductivity is 1*10<-5> S / cm or above, and the electrochemical window is 3.8 V or above, so that the composite solid polymer electrolyte membrane can be used in the fields of solid lithium batteries, electrochromic devices and the like, and short circuit is avoided after long-time use at high temperature.

Description

technical field [0001] The invention relates to the field of electrochemical devices, in particular, the invention relates to a composite solid polymer electrolyte membrane and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in the fields of consumer electronics and power energy storage, but due to the use of flammable liquid electrolytes, they have great safety hazards and relatively low energy density, and their application range is greatly limited. The solid-state lithium battery uses a non-flammable solid-state electrolyte, which has the characteristics of high energy density, wide operating temperature range, high safety, and flexibility. At present, the development of solid-state lithium batteries with high safety and high energy density is a hot spot in both academic and business circles. [0003] Solid-state electrolyte is the main difference between solid-state lithium battery and liquid lithium-ion batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525G02F1/1516
CPCG02F1/15165H01M10/0525H01M10/0565H01M10/058H01M2300/0088Y02E60/10Y02P70/50
Inventor 刘邵帅赵义丽陈彤红焦康安曼
Owner CHINA LUCKY FILM CORP
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