Surfactant-containing electrolyte of lithium-ion secondary battery

Abstract

The invention discloses surfactant-containing electrolytic solution of a lithium-ion secondary battery, which contains an organic solvent, a lithium salt electrolyte and a surfactant of a fluorine compound. The surfactant is ethoxylated nonionic fluorine carbon surfactant and has a chemical structural formula of RfCH2CH2O(CH2CH2O)mRc, wherein the Rf is a fluorine carbon chain hydrocarbon represented by F(CF2CF2)n; the value of m ranges from 0 to 100; the value of n in the fluorine carbon chain hydrocarbon ranges from 0 to 50; and the Rc may be one of H, Li, Na, K, Ru and the like, may be an alkyl such as methyl, ethyl and phenyl or an aromatic base, also may be Rf like fluorine carbon chain hydrocarbon structure. The surfactant can reduce the surface tension of electrolytic solution of a liquid lithium-ion secondary battery, optimizes the anode and cathode material and diaphragm wetting performance of the electrolytic solution, optimizes the electrochemical performance of the whole battery, improve capacity effectiveness of the whole battery by about 1 to 3 percent, allows the whole battery to circulate for 500 times at a power factor of 1C and improves the capacity retaining rateto 90 percent from the 80 percent in the prior art.

Description

technical field [0001] The invention relates to the technical field of high-energy batteries, in particular to a lithium-ion secondary battery electrolyte containing a surfactant. Background technique [0002] With the application of new lithium-ion secondary battery materials (such as new positive electrodes, new negative electrodes, and new diaphragms), higher requirements are put forward for the wetting performance of lithium-ion secondary battery electrolytes; [0003] The existing electrolyte system and the new lithium-ion battery material have poor wetting characteristics; thus resulting in poor liquid retention of the overall battery, deviations in the overall battery capacity, poor consistency of the overall battery, and poor cycle performance at rates above 1C; [0004] The development of new high specific capacity lithium-ion secondary batteries has further promoted the popularization and application of lithium-ion secondary battery electrolytes with better wettabi...

AI Technical Summary

Problems solved by technology

[0003] The existing electrolyte system and the new lithium-ion battery material have poor wetting characteristics; thus resulting in poor liquid retent...