Layered O3-type Na9/10Cr1/2Fe1/2O2 as new cathode for rechargeable sodium-ion battery

Sodium-ion batteries (SIBs) are pondered as an auspicious solution for energy storage sector owing to cost effectiveness and plenteous of sodium resources. In this article, the O3-type layered Na9/10Cr1/2Fe1/2O2 (O3-NCF) compound was made by simple solid state reaction. Rietveld refinement revealed that the prepared material possesses R-3 m space group of rhombohedral structure. Hexagonal shaped particle in O3-NCF was exposed from HR-TEM images. The as-prepared O3-NCF provided an initial reversible capacity of 129 mAh g−1 at 0.1 C, between 2 and 4 V and sustained with 89.30 mAh g−1 after 100 cycles. Therefore, the O3-NCF was as a favorable cathode material for SIBs.