Li 2 ZrO 3 -Coated Monocrystalline LiAl 0.06 Mn 1.94 O 4 Particles as Cathode Materials for Lithium-Ion Batteries.

Li 2 ZrO 3 -coated and Al-doped micro-sized monocrystalline LiMn 2 O 4 powder is synthesized through solid-state reaction, and the electrochemical performance is investigated as cathode materials for lithium-ion batteries. It is found that Li 2 ZrO 3 -coated LiAl 0.06 Mn 1.94 O 4 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, Li 2 ZrO 3 -coated LiAl 0.06 Mn 1.94 O 4 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 Li 2 ZrO 3 -coating.