Completely suppressed high-voltage phase transition of P2/O3-Na0.7Li0.1Ni0.1Fe0.2Mn0.6O2viaLi/Ni co-doping for sodium storage

A novel P2/O3-Na 0.7 Li 0.1 Ni 0.1 Fe 0.2 Mn 0.6 O 2 cathode is prepared via Li/Ni co-doping, and delivers attractive cycling and rate performances due to the high Na + diffusion coefficient and the complete suppression of the high-voltage P2–Z phase transition.