Abstract
Due to the abundant presence of Na, sodium ion batteries show great potential in electric vehicles, portable electronic devices, and energy storage systems. Recently, layered oxides with P2 structure have considered as the promising cathodes for sodium ion batteries. In this paper, P2-type layered oxide Na0.67Ni0.33Mn0.67O2 was prepared by a simple solid-state method and enhanced by Cu/Mo co-substitution. The Cu/Mo co-doped sample Na0.67Ni0.33Mn0.57Cu0.05Mo0.05O2 exhibited improved electrochemical performance compared to the raw material. It delivered an initial reversible discharge capacity of 142 mAh g−1 in the voltage range from 2 to 4.5 V at 0.2 C with a high capacity retention of 91.5%. This work may provide a promising strategy to develop electrochemical performance of cathode materials for advanced sodium ion batteries.
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