Electrochemical properties of nanometer-sized 0.6Li2MnO3·0.4LiNi0.5Mn0.5O2 composite powders prepared by flame spray pyrolysis

Abstract: Nanometer-sized 0.6Li2MnO3·0.4LiNi0.5Mn0.5O2 composite cathode powders are prepared directly by high-temperature flame spray pyrolysis. The precursor powders and the powders post-treated at 800°C exhibit mixed-layered crystal structures comprising layered Li2MnO3 and layered LiNi0.5Mn0.5O2 phases. The discharge capacity of the precursor powders decreased from 193mAhg−1 to 96mAhg−1 by the 9th cycle, corresponding to a capacity retention of 49.7%. Post-treatment at 800°C increases the capacity retention of the post-treated composite powders to 94.6% after 50 cycles, corresponding to a decrease in the discharge capacity from 225 to 213mAhg−1. The post-treated composite powders that contain a high amount of the Li2MnO3 phase have a high initial discharge capacity and good cyclability. [Copyright &y& Elsevier]