Uniform Bi-Bi2o3 Nanoparticles/Reduced Graphene Oxide Composites for High-Performance Aqueous Alkaline Battery

Aqueous alkaline battery (AAB) with the merits of both high energy density and power density has emerged as one of most promising candidates for the new generation of energy storage devices, while their practical applications are still limited by the lack of high-performance electrode materials, especially for the anode materials. Herein, metallic bismuth-bismuth Oxide nanoparticles (Bi-Bi2O3), with numerous heterogeneous interfaces, are successfully anchored and uniformly distributed on the reduced graphene oxide (rGO) sheets. When used as the anode material for AAB, it shows a high specific capacity of 288.0 mAh g-1 (1036.9 F g-1) at 1 A g-1 and good rate capability (74.7% of capacity retention ratio at 20 A g-1). Additionally, in order to well match with Bi-Bi2O3/rGO-20 anode, the CoVSx thin sheets decorated with Ni-Co Layered Double Hydroxide sheets (NiCo-LDH) are successfully constructed via a facile multistep hydrothermal method and a subsequent electrodeposition process. The resulting cathode exhibits a high specific capacity of 306.0 mAh g-1 (2448 F g-1) at 1 A g-1. The assembled CoVSx@NiCo-LDH//Bi-Bi2O3/rGO-20 AAB delivers an outstanding energy density of 106.1 Wh/kg at a power density of 789.6 W/kg. And the assembled Bi-Bi2O3/rGO-20//Zn batteryexhibits a specific capacity of 250.6 mAh g-1 at 1 A g-1.