Gel polymer electrolyte, solid-state battery, preparation method of gel polymer electrolyte and application

Abstract

The invention discloses a gel polymer electrolyte, a solid-state battery, a preparation method of the gel polymer electrolyte and application. The preparation method of the gel polymer electrolyte comprises the following step that: polymerization reaction is carried out on precursor liquid so as to obtain the gel polymer electrolyte, wherein the precursor liquid comprises garnet type solid electrolyte, acrylonitrile, lithium salt and a solvent, the mass ratio of the garnet type solid electrolyte to the acrylonitrile is (45-55): (55-45), the solvent comprises a compound A and a compound B, and the volume ratio of the compound A to the compound B is (6-8): (4-2), the compound A is represented by a chemical formula described in the specifications of the invention, in which X1-X3 are independently selected from C1-3 alkyl groups, and the compound B is represented by a chemical formula described in the specifications of the invention, in which m is 0-8, n is 1-4, and m and n are integers. According to the preparation method of the gel polymer electrolyte, the gel polymer electrolyte can be prepared on the premise of not adding ionic liquid, and the solid-state battery prepared from the gel polymer electrolyte is high in fire resistance, wide in electrochemical window and high in conductivity.

Description

technical field [0001] The invention relates to a gel polymer electrolyte, a solid state battery and a preparation method and application thereof. Background technique [0002] The electrolyte is an important part of the high-performance secondary lithium battery. As the medium for lithium ion transmission, the electrolyte has an important impact on the energy density, cycle life and safety performance of the battery. It is easy to use flammable and unstable organic liquid solvents. Lead to lithium-ion battery leakage, combustion, battery structural strength deterioration, etc., there are serious safety hazards, which seriously hinder the further development of liquid lithium-ion batteries. In contrast, the solid electrolyte has no leakage, low flammability and corrosion, and can be independently supported and used as a diaphragm, which can avoid some problems of the liquid electrolyte, but the low ionic conductivity of the solid electrolyte at room temperature limits its fu...

AI Technical Summary

Problems solved by technology

[0007] The present invention is mainly to overcome the need to add ionic liquid in the prior art to enhance the fire resistance and oxidation stability of the gel polymer electrolyte, but it will reduce the mechanical performance, and the electrochemical window is still relatively narrow, and a gel polymer electrolyte, solid-state battery and its preparation method and application are provided

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