Preparation method of composite solid electrolyte and application of composite solid electrolyte in solid-state lithium ion battery

Abstract

The invention discloses a preparation method of a composite solid electrolyte and application of the composite solid electrolyte in a solid-state lithium ion battery. The preparation method comprisesthe following steps: taking fiber material as a main composite component of the composite solid electrolyte to be dispersed in an organic solvent; fully performing stirring until a fiber material is uniformly dispersed in an organic solvent, adding a lithium salt, fully dissolving the lithium salt, blending the solution with a polymer, fully performing mixing at 20-60 DEG C, selectively adding a plasticizer or / and inorganic oxide nanoparticles, and uniformly performing stirring and mixing to obtain a composite solid electrolyte; the invention also discloses an application of the composite solid electrolyte in a solid-state lithium ion battery. According to the invention, the fiber material is used as a support body of the solid electrolyte membrane, the fiber material is uniformly mixed with the polymer PEO-based or PPC-based solid electrolyte to obtain the composite solid electrolyte, the composite solid electrolyte shows good electrochemical performance when being used in the solid lithium ion battery, and the cycling stability of the lithium ion battery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state lithium-ion batteries, and in particular relates to a preparation method of a composite solid-state electrolyte and its application in solid-state lithium-ion batteries. Background technique [0002] Due to the explosions caused by electric vehicle fires and high heat production of mobile phones in recent years, R&D personnel have paid great attention to the safety performance of lithium batteries. At the same time, semi-solid and all-solid electrolyte membranes have replaced electrolytic Liquid can effectively ensure the safety performance of lithium-ion batteries and has attracted extensive attention from researchers at home and abroad. As a safety representative of lithium-ion batteries, solid-state lithium-ion batteries not only have outstanding safety performance, but also have the characteristics of high energy density. [0003] Solid electrolytes at this stage are mainly divided in...

AI Technical Summary

Problems solved by technology

Inorganic solid electrolytes have serious interface problems and poor flexibility

Organic polymer electrolytes have excellent flexibility and are in good contact with the positive and negative interfaces, but organic polymer electrolytes are affected in reality due to their poor mechanical properties and low electrical conductivity.

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