Novel titanium-based O-3-type NaTi0.5Ni0.5O2 as a cathode material for sodium ion batteries

O-3-type NaTi0.5Ni0.5O2 is explored as a titanium-based cathode material for sodium ion batteries. It delivers a reversible capacity of 121 mA h g(-1) at 0.2 C with smooth charge-discharge curves, and exhibits excellent cycling stability and good rate capability, indicating its superiority as a promising candidate electrode material for sodium ion batteries.