Enhanced Cathode Performance: The Heterostructure Construction of LiCoO@CoO@LiLaZrTaO.

In this study, the heterostructure cathode material LiCoO@CoO@LiLaZrTaO was prepared by coating LiLaZrTaO on the surface of LiCoO through a one-step solid-phase synthesis. The morphology, structure, electrical state, and elemental contents of both pristine and modified materials were assessed through a range of characterization techniques. Theoretical calculations revealed that the LCO@LLZTO material possessed a reduced diffusion barrier compared to LiCoO, thereby facilitating the movement of Li ions. Electrochemical tests indicated that the capacity retention rate of the modified cathode composites stood at 70.43% following 300 cycles at a 2C rate. This high rate occurred because the LiLaZrTaO film on the surface enhanced the migration of Li, and the spinel phase of CoO had better interfacial stability to alleviate the generation of microcracks by inhibiting the phase change from the layered phase to the rock-salt phase, which considerably improved the electrochemical properties.