Recent progresses on electrolytes of fluorosulfonimide anions for improving the performances of rechargeable Li and Li-ion battery

Abstract

Abstract Fluorosulfonimide anions, including bis(fluorosulfonyl)imide ([(FSO 2 ) 2 N] − , FSI − ) and (fluorosulfonyl)(perfluoroalkanesulfonyl)imide ([(FSO 2 )( n −C m F 2 m +1 SO 2 )N] − , m = 1, 2, 4, 6, 8, etc.) anions, play an increasingly important role in electrolyte materials for rechargeable Li and Li-ion battery. Recent advances in the synthesis of fluorosulfonimides and their alkali metal salts are summarized. The main advances on the electrolytes of these anions for improving the electrochemical performances of rechargeable Li and Li-ion battery are reviewed, in terms of the types of electrolytes, including conventional liquid carbonate electrolytes, ionic liquid electrolytes, molten salt electrolytes, and solid polymer electrolytes.