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.

Surface LiMnNiMoO Coating and Bulk Mo Doping of Li-Rich Mn-Based LiMnNiCoO Cathode with Enhanced Electrochemical Performance for Lithium-Ion Batteries.

To improve the initial Coulombic efficiency, cycling stability, and rate performance of the Li-rich Mn-based LiMnNiCoO cathode, the combination of LiMnNiMoO coating with Mo doping has been successfully carried out by the sol-gel method and subsequent dip-dry process. This strategy buffers the electrodes from the corrosion of electrolyte and enhances the lattice parameter, which could inhibit the oxygen release and maintain the structural stability, thus improving the cycle stability and rate capability. After LiMnNiMoO modification, the initial discharge capacity reaches 272.