An Na/TM-site Mg substituted P2-Na2/3[Fe1/3Mg1/12Mn7/12]O2 cathode with extremely high capacity for sodium-ion batteries

The well-designed Na/TM-site Mg substituted P2-Na 2/3 [Fe 1/3 Mg 1/12 Mn 7/12 ]O 2 exhibits extremely high energy density, highly reversible anionic redox reaction, robust crystal structure, and superior sodium storage performance.