Solid electrolyte membrane as well as preparation process and application thereof

Abstract

The invention discloses a solid electrolyte membrane as well as a preparation process and an application thereof. The solid electrolyte membrane is prepared from a polymer matrix, a modified inorganicfiller and a lithium salt. The inorganic filler is modified, so that the agglomeration effect of the inorganic filler in an organic solvent can be effectively reduced, and the inorganic solid polymerelectrolyte membrane with high dispersibility is obtained. The surface of the inorganic filler is grafted with a silane coupling agent through covalent bonds, so that the interaction between the polymer matrix and the inorganic filler can be enhanced, the interface affinity between the polymer electrolyte thin film and the electrode material is improved, and the inorganic solid polymer electrolyte membrane which is high in electrical conductivity, low in interface impedance, strong in mechanical property and the like can be obtained. The preparation method has the advantages that materials are easy to obtain, the preparation process is simple, the obtained inorganic solid state polymer electrolyte membrane is excellent in performance, and large-scale preparation is facilitated.

Description

technical field [0001] The invention belongs to the technical field of all-solid lithium batteries, and relates to a solid polymer electrolyte film and its preparation process and application. Background technique [0002] As a key material of lithium-ion batteries, electrolyte affects and even determines various macroscopic electrochemical properties such as specific energy, life, safety performance, charge and discharge performance, and high and low temperature performance of the battery. The current electrolyte has developed from the previous liquid electrolyte to the solid electrolyte. Replacing liquid electrolyte with solid electrolyte is a major progress in the development of lithium-ion batteries. Its notable feature is that it improves the safety performance of the battery, is easy to process into a film, and can be made into an all-plastic structure, so that ultra-thin and various shapes can be manufactured. Battery: It can well adapt to the volume change of the el...

AI Technical Summary

Problems solved by technology

However, due to the high crystallinity of the polymer matrix, the conductivity at room temperature is very low (about 10 -6 ~10 -7 S / cm) limits its practical application

Inorganic solid electrolyte has high room temperature lithium ion conductivity and stability, but inorganic fillers are easy to agglomerate, have weak interaction with polymer matrix, poor contact wettability with electrode materials, and large interface impedance

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