An O3-type NaNi0.5Mn0.5O2 cathode for sodium-ion batteries with improved rate performance and cycling stability

Layered O3-type NaNi0.5Mn0.5O2 (space group: Rm) was synthesized by a sol–gel method, and subjected to electrochemical characterization for sodium-ion batteries (SIBs). A Na//NaNi0.5Mn0.5O2 cell can deliver a reversible capacity of 141 mA h g−1 in the voltage range of 2.0–4.0 V and show a good capacity retention of 90% after 100 cycles. A highly reversible structural evolution of O3hex.–O3′mon.–P3hex.–P3′mon.–P3′′hex. upon Na+ extraction and intercalation is demonstrated to be the key factor to its excellent cycling capability. Furthermore, the apparent diffusion coefficient of Na ions in the layered O3-type NaNi0.5Mn0.5O2 composite electrode can be effectively increased by using good conductive CNTs, which is demonstrated by cyclic voltammograms and the galvanostatic intermittent titration technique. Thus even at a high rate of 2C, the O3-NaNi0.5Mn0.5O2 cathode still exhibits a high reversible capacity of 80 mA h g−1. The impressive sodium storage properties of O3-NaNi0.5Mn0.5O2 make it a promising candidate as a positive electrode material for rechargeable SIBs.

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