Simultaneous synthesis and synergetic stabilization of Zr-doped and Li6Zr2O7-coated Ni-rich layered cathode for advanced lithium ion batteries

Ni-rich cathode materials, one of the most promising cathodes for high-energy lithium-ion batteries, are still suffered from interfacial instability and bulk degradation. Herein, Zr-doped and Li6Zr2O7-coated LiNi0.8Co0.1Mn0.1O2 cathode, and Zr-doped Li6Zr2O7-LiNi0.8Co0.1Mn0.1O2 composite are successfully pre-pared via a smart one-step calcination process. The attained dual-modified architecture allows the optimized sample exhibiting enhanced rate performance while maintaining long-term stability at room temperature (82.13% after 200 cycles at 1 C rate) and even at elevated temperature. Further studies reveal that the delayed temperature-driven phase transition and the suppressed interfacial degradation can be addressed with the synergetic effects provided by the Zr-doping and Li6Zr2O7-coating. The Zr doping could improve bulk stability by reducing cation disorder. The conductive Li6Zr2O7 surface coating enhances the interfacial stability of the cathode materials while improving the electrochemical kinetics. This smart modification strategy renders Zr modification a viable modification method to enhance the electrochemical performance and structural properties of Ni-rich cathode materials. (C) 2020 Published by Elsevier Ltd.