Summary:

The present invention belongs to the technical field of alkali metal ion battery, and specifically discloses a non-carbonated ethylene oxide electrolyte suitable for alkali metal ion battery and its application, which comprises an electrolyte salt, an organic solvent and a co-solvent; the electrolyte salt is a lithium salt or a potassium salt, and the organic solvent comprises propylene carbonate, and the co-solvent is fluorobenzene; The interaction between fluorobenzene and propylene carbonate can weaken the coordination strength of propylene carbonate and alkali metal ions, thereby changing the solvation structure of alkali metal ions and preventing the co-embedding effect of propylene carbonate and alkali metal ions. Under the condition that the electrolyte of the present invention does not add film-forming additives, by introducing a new type of co-solvent, the problem of incompatibility with the graphite anode due to PC co-embedding is effectively solved; The electrolyte is compatible with commonly used electrode materials such as graphite anode, ternary cathode, lithium iron phosphate, etc., and exhibits excellent electrochemical properties in a wide temperature range, with a wide range of applications.

Link：http://epub.cnipa.gov.cn/patent/CN115275354A