Li₂ZrO₃-Coated Monocrystalline LiAl_0.06Mn_1.94O₄ Particles as Cathode Materials for Lithium-Ion Batteries

Li₂ZrO₃-coated and Al-doped micro-sized monocrystalline LiMn₂O₄ powder is synthesized through solid-state reaction, and the electrochemical performance is investigated as cathode materials for lithium-ion batteries. It is found that Li₂ZrO₃-coated LiAl_0.06Mn_1.94O₄ delivers a discharge capacity of 110.90 mAhg^-1 with 94% capacity retention after 200 cycles at room temperature and a discharge capacity of 104.4 mAhg^-1 with a capacity retention of 87.8% after 100 cycles at 55 °C. Moreover, Li₂ZrO₃-coated LiAl_0.06Mn_1.94O₄ could retain 87.5% of its initial capacity at 5C rate. This superior cycling and rate performance can be greatly contributed to the synergistic effect of Al-doping and Li₂ZrO₃-coating.