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 NiCo2O4 nano wire electrode as the cathode. The NiCo2O4//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).