Electrochemical Performance of Li-rich Layered Cathode Material 0.6Li[Li1/3Mn2/3]O2•0.4LiNi5/12Mn5/12Co1/6O2 by ZrO2 Coating

Lithium-rich layered oxide materials 0.6Li[Li1/3Mn2/3]O-2 center dot 0.4LiNi(5/12)Mn(5/2)Co(1/6)O(2) (named as LNMCO) have been prepared by spray-drying method and followed by high temperature annealed and surface coated with ZrO2 The TEM results show that the ZrO2 layer with nano size particles is located on the surface of the particles. The initial coulombic efficiencies and discharge capacities of the 0.6Li[Li1/3Mn2/3]O-2 center dot 0.4LiNi(5/12)Mn(5/2)Co(1/6)O(2) ithium-riph layered oxide material are largely improved by ZrO2 coating, and the value is 87.2%, 279.3 mAh.g(-1), compared to 75.1%, 224.1 mAh.g(-1) respectively, for the bare sample at the room temperature and at a current density of 20 mA . g(-1) in the voltage range of 2.0 to 4.8 V when the content of ZrO2 is 1.5%. After 100 cycles, the 1.5% ZrO2 coated sample shows a high discharge capacity of 248.3 mAh.g(-1) with a capacity retention of 88.9%, while the bare LNMCO presents a lower discharge capacity of 195.9 mAh.g(-1) with a capacity retention of 87.4%.