Al2O3 coating on Li1.256Ni0.198Co0.082Mn0.689O2.25 with spinel-structure interface layer for superior performance lithium ion batteries

Li-rich manganese-based layered electrode materials are expected to be superior performance cathode materials for next-generation lithium ion batteries due to high capacity, low cost and environmentally benignity. However, the commercialization of such cathode materials is impeded by severe capacity fading and poor rate performance. To overcome these problems, Al2O3 is coated on the Li1.256Ni0.198Co0.082Mn0.689O2.25, meanwhile, spinel-structure interface layer is formed between the Li1.256Ni0.198Co0.082Mn0.689O2.25 and Al2O3 coating. This modified cathode material has a significant improvement on rate performance with a discharge capacity of 189 mAhg−1 at current density of 1250 mAg−1. In addition, it reveals a discharge capacity of 240 mAhg−1 at current densities of 250 mAg−1 and a retention of 95.2% after 60 cycles. The improved rate performance and cycling stability are benefited from the formation of spinel-structure interface layer and Al2O3 coating.