Lithium single ion conduction polymer electrolyte based on functionalized lithium borate

Abstract

The invention discloses a lithium single ion conduction polymer electrolyte based on functionalized lithium borate. A double-bond-containing functionalized lithium borate and a sulfydryl-containing compound are subjected to an alkene-sulfydryl click reaction, or the double-bond-containing functionalized lithium borate and the sulfydryl-containing compound and a double-bond-containing polyether are subjected to a poly-alkene-sulfydryl click reaction to prepare a linear or network-shaped all-solid-state or gel catalyst. The lithium single ion conduction polymer electrolyte prepared by the invention has the advantages of simple and easily implemented synthesis, low-cost and easily available raw materials, high room-temperature conductivity, high lithium ion mobility, wide electrochemical window, and the like; and a lithium battery assembled by the electrolyte provided by the invention has high safety, high rate capability, long cycle life and stability.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrolytes, and relates to a lithium single-ion conductive polymer electrolyte and a preparation method thereof. More specifically, it relates to a lithium single-ion conducting polymer electrolyte based on a functionalized lithium borate salt. Background technique [0002] With the rapid development of smart phones, smart mobile devices, electric vehicles, and hybrid vehicles, the energy density and safety performance requirements of lithium batteries are getting higher and higher. As an important part of lithium batteries, electrolyte has a great influence on battery performance. An ideal electrolyte requires high ionic conductivity, high lithium ion migration number, wide electrochemical window, good thermal stability, high mechanical strength, and good safety. [0003] Traditional lithium-ion batteries use liquid electrolytes, usually composed of organic liquids and lithium salts. And t...

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Problems solved by technology

[0006] At present, there are a lot of research work on lithium single-ion conductive polymer electrolytes at home and abroad, but there are many problems such as cumbersome synthesis steps, low room temperature conductivity, poor mechanical strength and film-forming performance.

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