Lithium-Ion Transport through a Tailored Disordered Phase on the LiNi0.5Mn1.5O4Surface for High-Power Cathode Materials

Abstract The phase control of spinel LiNi 0.5 Mn 1.5 O 4 was achieved through surface treatment that led to an enhancement of its electrochemical properties. Li + diffusion inside spinel LiNi 0.5 Mn 1.5 O 4 could be promoted by modifying the surface structure of LiNi 0.5 Mn 1.5 O 4 through phosphidation into a disordered phase ( Fd 3 m ) that allows facile Li + transport. Phosphidated LiNi 0.5 Mn 1.5 O 4 showed a significantly enhanced electrochemical performance, even at high rates exceeding 10 C, demonstrating that the improved kinetics (related to the amount of Mn 3+ ) can render LiNi 0.5 Mn 1.5 O 4 competitive as a high‐power cathode material for electric vehicles and hybrid electric vehicles.