LAUSR

High-Ni cathode materials with a layered structure generally suffer from structural instability induced by highly reactive Ni component especially at the surface. Crystalline LiNbO3, with excellent thermal stability and ionic conductivity, has the potential to considerably enhance the interfacial stability of these cathode materials. By optimizing the crystalline coating of bi-functional LiNbO3 on a high-Ni cathode material, we are able to improve cycle performance and rate capability by minimizing the direct exposure of Ni with electrolytes. Since a LiNbO3 coating layer directly affects electrochemical performance, we also focus on the correlation of LiNbO3 crystallinity with electrochemical behaviors of Li+ in the cathode materials. We show that the Li+ conducting behaviors are closely related to the crystallinity of LiNbO3. Highly crystalline LiNbO3 effectively suppresses the structural changes of the cathode materials by facilitating strain relaxation induced by repeated Li+ intercalation and de-intercalation into and from the host structure. Moreover, it offers a strong enhancement in mechanical and thermal stabilities at the elevated temperature above 60 °C. In this regard, this research provide a practical solution for successfully utilizing high-Ni layered cathode materials in commercial LIBs.