Solvent Free Lithium Molten Salt as Electrolyte of Lithium Secondary Battery

Abstract

Low-melting alkali metal salts containing a (fluorosulfonyl)(trifluoromethylsulfonyl)amide have possibility to be molten salt electrolytes for lithium secondary batteries. A composite graphite negative electrode can be combined with this molten salt along with the LiCoO2 and LiFePO4 positive electrode. The charge-discharge of a graphite || Li cell was successful without any organic solvent due to formation of a solid electrolyte interface derived by decomposition of the anion. Its discharge capacity is near the ideal value.