A P2-type Na0.7(Ni0.6Co0.2Mn0.2)O2 cathode with excellent cyclability and rate capability for sodium ion batteries

P2-type Na_0.7(Ni_0.6Co_0.2Mn_0.2)O₂ is synthesized and introduced as a cathode for sodium-ion batteries, which exhibits high reversible capacity, excellent high rate capability and superior long term cyclability.