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PEO film, preparation method thereof and solid-state battery

A CH-O-, -C2H3F-O- technology, applied in the field of solid-state batteries, PEO film and its preparation, can solve the problem that the PEO film cannot take into account the stability of the conductive contact performance itself, so as to improve the electron cloud density, good Stability, the effect of avoiding falling off

Active Publication Date: 2020-07-03
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a PEO film and its preparation method and solid-state battery, which are used to improve the current PEO film's inability to take into account the electrical conductivity, its contact performance with the positive and negative electrodes, and its own stability.

Method used

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  • PEO film, preparation method thereof and solid-state battery
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  • PEO film, preparation method thereof and solid-state battery

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preparation example Construction

[0035] Based on the same inventive concept, the present invention provides a kind of preparation method of PEO membrane, comprises the following steps:

[0036] Make ethylene oxide monomer and F-containing cyclic ether monomer generation copolymerization reaction, obtain the polymer precursor containing structural unit D, wherein, contain-C in the structural unit D 2 h 3 F-O-;

[0037] The polymer precursor is subjected to de-F treatment to form a polymer glue containing structural unit B, and the polymer glue is subjected to film-forming treatment to obtain the PEO film; wherein, the structural unit B contains -CH= CH-O-.

[0038] In the PEO film obtained by the preparation method of the present invention, a structural unit B containing -CH=CH-O- is formed in the final prepared PEO film, because in the structural unit B, the oxygen atom adjacent to the alkene has The lone pair of electrons, compared with saturated hydrocarbons, the structural unit B is more inclined to tra...

Embodiment 1

[0071] The present invention is a PEO electrolyte membrane, prepared by the following method:

[0072] S1, combine oxirane monomer with F-containing cyclic ether monomer According to the mass ratio of 19:1, at room temperature 25°C ± 5°C, stir evenly in the aprotic solvent ethylene glycol dimethyl ether, use fluoride ion (KF / LiCl) as the catalyst, react for 15h, and filter to obtain the polymer precursor ;

[0073] In this reaction process, oxirane monomer and F-containing cyclic ether monomer After the reaction, the main chain structure contains structural unit A and structural unit D1 polymer precursors;

[0074] S2, the prepared polymer precursor is dispersed in the organic solvent NMP to be made into polymer glue, feeds the nitrogen or clean air that water content is 200ppm, and stirs 60min, obtains polymer glue;

[0075] In this process, structural unit D1 De-F treatment will be carried out, so that part of the structural unit D1 will be transformed into struct...

Embodiment 2

[0079] The present invention is a PEO electrolyte membrane, prepared by the following method:

[0080] S1, combine oxirane monomer with F-containing cyclic ether monomer According to the mass ratio of 19:1, at room temperature 25°C ± 5°C, stir evenly in the aprotic solvent ethylene glycol dimethyl ether, use fluoride ion (KF / LiCl) as the catalyst, react for 15h, and filter to obtain the polymer precursor ;

[0081] In the reaction process, the oxirane monomer and the F-containing cyclic ether monomer react to generate a compound containing the structural unit A and structural unit D2 polymer precursors;

[0082] S2, the prepared polymer precursor is dispersed in the organic solvent NMP to be made into polymer glue, feeds the nitrogen or clean air that water content is 200ppm, and stirs 60min, obtains polymer glue;

[0083] In this process, the structural unit D2 will undergo de-F treatment, so that part of the structural unit D2 will be transformed into the structural u...

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Abstract

The invention relates to the field of batteries, and discloses a PEO film, a preparation method thereof and a solid-state battery. The molecular structure of the PEO film comprises a structural unit B, and the structural unit B comprises -CH = CH-O-. By utilizing the PEO film, the problem that the existing PEO film cannot give consideration to the conductivity, the contact performance with the positive electrode and the negative electrode and the self-stability can be solved, and the purpose of improving the conductivity and the self-stability of the PEO film is achieved.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a PEO film, a preparation method thereof and a solid-state battery. Background technique [0002] With the rise of portable electronic devices, wearable electronic devices and environmentally friendly green electric vehicles, the demand for research and development of flexible and high-safety and high-reliability power supply equipment is increasing. [0003] Since solid-state batteries use solid polymer electrolytes instead of traditional liquid electrolytes, there are no safety issues such as liquid leakage, combustion and explosion. The polymer electrolyte in solid-state batteries is a polymer heterogeneous composite material in the form of a solid-state ion conductor, which can be used as a separator and an electrolyte at the same time. [0004] PEO-based electrolyte membrane has become the most widely used electrolyte membrane due to its good lithium ion transport performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/0565H01M10/052H01M2300/0085Y02E60/10H01M2300/0082H01M10/0585Y02P70/50H01M50/46H01M50/411C08G65/2639
Inventor 王康平曹晨陈超李旭李洋
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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