Enhancing structural stability of layered O3-type Na-Mn-Ni-Cu-O cathode material through copper substitution for sodium batteries

Sodium-ion batteries (SIBs) are generally auspicious solutions for large-scale electrochemical energy storage devices by reason of broad distribution of sodium (Na) sources and economically viable. In this article, layered O3-type Na0.9Mn0.55Ni0.35Cu0.1O2 cathode material was prepared by using conventional solid state reaction for SIBs. This material displayed high specific discharge capacity of 168.22 mAh g−1 at of 0.1C rate, among 2 and 4 V and exhibited good coulombic efficiency. The copper (Cu) swap enriched the electrochemical performances of the obtained O3-type cathodes by maintaining the structural stability.