Flexible Ultrafast Aqueous Rechargeable Ni//Bi Battery Based on Highly Durable Single-Crystalline Bismuth Nanostructured Anode.

A new type of ultrafast Ni//Bi battery with high flexibility and impressive electrochemical performance is demonstrated for the first time based on an as-prepared Bi electrode as the anode and a NiCo2 O4 nanowire electrode as the cathode. The NiCo2 O4 //Bi battery is able to deliver a remarkable energy density of 85.8 W h kg-1 at a power density of 1.02 kW kg-1 , and still retains 55.4 W h kg-1 when the power density is increased to 21.2 kW kg-1 .