Sandwich type solid composite electrolyte membrane as well as preparation method and application thereof

Abstract

The invention discloses a sandwich type solid-state composite electrolyte membrane and a preparation method and application thereof, the electrolyte membrane is formed by permeating a composite electrolyte into a microporous diaphragm, and the composite electrolyte is composed of a high-molecular polymer material, a lithium salt and an ionic liquid. Or the electrolyte is composed of the inorganic solid electrolyte powder, the high-molecular polymer material, the lithium salt and the ionic liquid. The preparation method comprises the following steps: preparing raw materials into slurry, and coating two surfaces of the microporous diaphragm with the slurry. The electrolyte membrane disclosed by the invention has the advantages of relatively good thermal stability and electrochemical stability, relatively high ion transference number, ionic conductivity and safety, easiness in forming and processing, excellent mechanical property and the like, is a novel solid-state composite electrolyte membrane with excellent performance, and can be used for constructing a solid-state battery with high specific capacity, good cycling stability and good safety; the use value is high and the application prospect is good. The preparation method of the electrolyte membrane has the advantages of simple process, continuous production and the like, is suitable for large-scale preparation, and is convenient for industrial application.

Description

technical field [0001] The invention belongs to the technical field of electrolyte membranes for new energy solid-state lithium batteries, and relates to a preparation method and application of a solid composite electrolyte membrane, in particular to a sandwich-type solid composite electrolyte membrane, a preparation method thereof, and an application in a solid-state battery. Background technique [0002] At present, lithium-ion batteries, as important energy storage components, are widely used in portable electronic devices, electric vehicles and other fields. They also show broad application prospects and huge potential economic benefits in the fields of grid energy storage, space technology and national defense industry. However, potential safety issues restrict its application in higher energy density energy storage systems. Compared with liquid lithium-ion batteries, solid-state lithium batteries replace liquid organic electrolytes with non-volatile and non-flammable s...

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Problems solved by technology

Inorganic solid electrolytes have the advantages of high room temperature ionic conductivity, high ion transfer number, good thermal stability, and wide electrochemical stability window. However, this type of electrolyte still has complex molding processes and poor wettability between solid and solid contacts with electrodes. and other shortcomings

Solid organic polymer electrolytes are known for their excellent film-forming properties, and have the advantage of being elastic and easy to deform, which can effectively improve the interfacial contact between the electrode and the electrolyte. However, the polymer matrix usually has a high degree of crystallinity, and the electrolyte has low room temperature ionic conductivity. (10 -7 ~10 -8 S / cm) and the narrow electrochemical window limit its practical application

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