Effect of the Lithium Salt Concentration on Deposition and Dissolution of Lithium in a Bis(fluorosulfonyl)Amide-Based Ionic Liquid Electrolyte

摘要

Lithium metal is considered to be an ideal anode material for high-power lithium secondary batteries because of the high theoretical specific capacity of 3860 mAh g~(-1) and the negative redox potential. However, dendritic, needle-like or whisker-like growth of Li deposits may cause the internal short circuit and thermal runaway of the battery. The detachment of lithium from the current collector also leads to the capacity loss. The formation of homogeneous and stable solid electrolyte interphase (SEI) on the anode is considered to suppress the concentration of the current and dendritic growth of Li deposits.