Influence of Na/Mn arrangements and P2/P′2 phase ratio on the electrochemical performance of Na x MnO 2 cathodes for sodium-ion batteries

Among the candidate cathode materials for sodium-ion batteries (SIBs), Na x MnO 2 (NMO) layered oxides are especially attractive in terms of working potential ( ca. 3.0 V vs. Na + /Na) and high initial specific charge.