High mass loading NiCo-OH nanothorns coated CuO nanowire arrays for high-capacity nickel-zinc battery.

The rational design of cathode materials with core-shell heterostructures is significant to develop a Ni//Zn battery with both high gravimetric and areal energy density under high mass loading. In this work, the NiCo-OH nanothorns with a mass loading of 11.6 mg cm-2were coated on CuO nanowire arrays via a chemical bath deposition method. Thanks to the construction of 3D core-shell nanowire arrays and appropriate cobalt doping, as-fabricated Ni//Zn battery based on the NiCo-OH as cathode achieved the maximum specific capacity of 383 mAh g-1at 5 mA cm-2with high energy density of 649 Wh kg-1at 0.73 kW kg-1, indicating good energy storage performance in Ni//Zn battery.