Effect of glutaric anhydride additive on the LiNi0.4Mn1.6O4 electrode/electrolyte interface evolution: A MAS NMR and TEM/EELS study

► Change of composition of interphase at high potential. ► Glutaric anhydride promotes the formation of fluorophosphates. ► Flurophosphates are more stable than LiF on the surface of active material. ► Additive does not prevent dissolution of Mn from the active material.