A highly homogeneous nanocoating strategy for Li-rich Mn-based layered oxides based on chemical conversion

Abstract Herein, we report a novel strategy for preparing a highly homogeneous nanocoating for Li-rich Mn-based layered oxides by the elemental Al doping followed by chemical conversion in phosphate buffer solution. X-ray photoelectron spectroscopy, soft X-ray absorption spectroscopy and transmission electron microscopy results exhibit that there exist AlPO 4 nanocoating on the surface of particles. The resultant AlPO 4 -nanocoated Li[Li 0.2 Ni 0.11 Co 0.11 Mn 0.54 Al 0.04 ]O 2 particles exhibit a greatly enhanced reversible capacity with superior thermal stabilities in relative to pristine Li[Li 0.2 Ni 0.13 Co 0.13 Mn 0.54 ]O 2 . Under a current density of 30 mA g −1 , the AlPO 4 -nanocoated Li[Li 0.2 Ni 0.11 Co 0.11 Mn 0.54 Al 0.04 ]O 2 can deliver a specific capacity of 282.1 mAh g −1 with capacity retention of 89% after 35 cycles.