A new phosphonamidate as flame retardant additive in electrolytes for lithium ion batteries

Abstract A new phosphonamidate, bis(N,N-diethyl)(2-methoxyethoxy)methylphosphonamidate (DEMEMPA) has been synthesized as N-P collaborative flame retardant additive in electrolytes for lithium ion batteries (LIBs). It is found that adding 10 vol.% of DEMEMPA to 0.9 M LiPF 6 /EC/DMC can significantly inhibit the burning of electrolytes and provide a wide electrochemical window. Further studies indicate that the electrolytes with and without DEMEMPA have similar electrochemical behavior with natural graphite and LiFePO 4 electrodes. These support the feasibility of using DEMEMPA as a flame retardant additive for LIBs.