Li-Deficient Materials-Decoration Restrains Oxygen Evolution Achieving Excellent Cycling Stability of Li-Rich Mn-Based Cathode.

With the increasing demand for high energy density and rapid charging performance, Li-rich materials have been the up and coming cathodes for next-generation lithium-ion batteries. However, because of oxygen evolution and structural instability, the commercialization of Li-rich materials is extremely retarded by their poor electrochemical performances. In this work, Li-deficient materials Li 0.3 NbO 2 and (Nb 0.62 Li 0.15 )TiO 3 are applied to functionalize the surface of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 , aiming to suppress oxygen evolution and increase structural stability in LIBs. In addition, a fast Li-ion transport channel is beneficial to enhance Li + diffusion kinetics. The results demonstrate that the electrodes decorated with Li 0.3 NbO 2 and (Nb 0.62 Li 0.15 )TiO 3 materials exhibit more stable cycling stability after long-term cycling and outstanding rate capability.