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 LiNbO and (NbLi)TiO are applied to functionalize the surface of LiMnNiCoO, 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 LiNbO and (NbLi)TiO materials exhibit more stable cycling stability after long-term cycling and outstanding rate capability.