Lithium Ion Solid State Electrolyte Film and Its Application

Abstract

The invention belongs to the field of solid-state lithium batteries, and specifically discloses a lithium-ion solid-state electrolyte film and an application thereof, which can be used for preparing secondary solid-state lithium batteries. The lithium ion solid electrolyte film is composed of 60 wt.%-90 wt.% lithium ion solid electrolyte ceramic powder, 20 wt.%-5 wt.% phase change agent and 20 wt.%-5 wt.% crown ether lithium Salt composition, prepared by phase transition technology, coating method and solution impregnation method. Compared with common lithium-ion solid-state electrolyte films, the advantages of the lithium-ion solid-state electrolyte films disclosed by the present invention are: the composition is mainly based on ceramic powder, and does not contain polymer gel electrolyte; sintering-free; high ion conductivity ; stable to lithium metal; wide electrochemical window; good high temperature resistance, simple preparation, uniform and controllable thickness, etc. The lithium-ion solid-state electrolyte film can be used to make secondary solid-state lithium-air batteries and solid-state lithium-ion batteries.

Description

technical field [0001] The invention belongs to the field of solid-state lithium batteries, and in particular relates to a lithium-ion solid-state electrolyte film and its application, which can be used to prepare secondary solid-state lithium batteries. Background technique [0002] With the rapid development of electric vehicles and portable electronic products, lithium batteries with higher energy density have become one of the research hotspots in the field of power batteries and energy storage. However, the current commercial lithium-ion batteries all use organic electrolytes, which have limitations and potential safety hazards during use. Compared with liquid electrolytes, solid electrolytes have better mechanical strength, thermal stability, and safety, and can inhibit the growth of lithium dendrites. Therefore, using solid lithium ion electrolytes to make solid secondary lithium batteries has become a new trend in the development of lithium batteries. [0003] Howe...

AI Technical Summary

Problems solved by technology

This kind of composite solid electrolyte film is dominated by gel electrolyte in composition, which makes the solid electrolyte film have problems such as insufficient density and poor mechanical strength.

In addition, in the composite process of PEO and solid electrolyte, uneven distribution and poor surface flatness are prone to occur, which is not conducive to the uniform deposition of lithium during the discharge process, thus adversely affecting the performance of lithium batteries

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