Plane-Selective Coating of Li2SnO3 on Li[NixCo1–x]O2 for High Power Li ion Batteries

Interphase engineering is becoming increasingly important in improving the electrochemical performance of cathode materials for rechargeable batteries, including Li ion, Li metal, and all-solid-state batteries, because irreversible surface reactions, such as electrolyte decomposition, and transition metal dissolution, constitute one of these batteries’ failure modes. In this connection, various surface-engineered cathode materials have been investigated to improve interfacial properties. No synthesis methods, however, have considered a plane-selective surface modification of cathode materials. Herein, we introduce the basal-plane-selective coating of Li 2 SnO 3 on layered Li[Ni x Co 1– x ]O 2 ( x = 0 and 0.5) using the concept of the thermal phase segregation of Sn-doped Li[Ni x Co 1– x ]O 2 due to the solubility variation of Sn in Li[Ni x Co 1– x ]O 2 with respect to temperature. The pl…