Al(2)O(3)-coated Li(1.2)Mn(0.54)Ni(0.13)Co(0.13)O(2) nanotubes as cathode materials for high-performance lithium-ion batteries

Li-rich manganese-based layered cathode Li(1.2)Mn(0.54)Ni(0.13)Co(0.13)O(2) (LMNCO) nanotubes are synthesized by electrospinning and surface coated with different amounts of amorphous Al(2)O(3). The effects of the coating content of Al(2)O(3) on the structural and electrochemical performances of LMNCO nanotubes are investigated systematically. The results show that the morphologies and structures of the samples exhibit no apparent changes after being coated with Al(2)O(3). Electrochemical tests indicate that the Al(2)O(3)-coated LMNCO nanotubes exhibit obviously enhanced electrochemical performances. The initial coulombic efficiency of surface modified LMNCO nanotubes increased from 74.9% to 85.2%, and the modified LMNCO nanotubes have a high capacity retention of 97.6% after 90 cycles at 1C. The improved electrochemical performances of the coated samples are attributed to the protective function of the uniform Al(2)O(3) coating and the three-dimensional Li(+) diffusion channel in the spinel interface layer.