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Lithium-Ion Transport through a Tailored Disordered Phase on the LiNi0.5Mn1.5O4 Surface for High-Power Cathode Materials



The phase control of spinel LiNi0.5Mn1.5O4 was achieved through surface treatment that led to an enhancement of its electrochemical properties. Li+ diffusion inside spinel LiNi0.5Mn1.5O4 could be promoted by modifying the surface structure of LiNi0.5Mn1.5O4 through phosphidation into a disordered phase (Fd3m) that allows facile Li+ transport. Phosphidated LiNi0.5Mn1.5O4 showed a significantly enhanced electrochemical performance, even at high rates exceeding 10 C, demonstrating that the improved kinetics (related to the amount of Mn3+) can render LiNi0.5Mn1.5O4 competitive as a high-power cathode material for electric vehicles and hybrid electric vehicles.