Suppressing interlayer-gliding and Jahn-Teller effect in P2-type layered manganese oxide cathode via Mo doping for sodium-ion batteries

Manganese-based layered oxides are one of the most promising cathode materials for sodium-ion batteries (SIBs) due to their high specific capacity and low cost of manganese and sodium. However, they are limited by the poor cycling stability caused by irreversible phase transitions and Jahn-Teller effect of Mn 3+ . Herein, Mo-doped P2-Na 0.67 Mn 1-x Mo x O 2 suppress the irreversible phase transition of P2-OP4 resulted from gliding of MnO 2 -slabs. It reveals that no phase transition occurs under high voltage via Mo elements doping into MnO 6 -layers. P2-Na 0.67 Mn 1-x Mo x O 2 displays high cyclic stability with a high capacity retention of 86.4% after 100 cycles and improved rate performance with an average working voltage of 2.61 V. The research provides a new perspective for designing novel layered oxide cathodes design toward high-performance SIBs.