Bismuth Oxide Selenium/Graphene Oxide Composites: Toward High‐Performance Electrodes for Aqueous Alkaline Battery

Abstract

Aqueous alkaline battery represents a promising energy storage technology with both high energy density and high power density as rechargeable batteries. However, the low theoretical capacities, kinetics and stability of anode materials have limited their developments and commercializations. In this study, we propose a novel method to produce two‐dimensional layered bismuth oxide selenium (Bi2O2Se) and reduced graphene oxide (rGO) composites via a one‐step hydrothermal method. The volume change caused by phase change during rapid charging and discharging is significantly reduced and the capacity reaches 263.83 mAh g−1 at a current density of 0.5 A g−1. The Bi2O2Se/rGO electrode exhibits excellent cycling stability in which the capacity retention rate is 81.04% after 5000 cycles. More importantly, the Bi2O2Se/rGO nanosheet composite is used as the anode electrode material with MnCo2O4.5@Ni(OH)2 as the cathode electrode material in aqueous alkaline battery. When the energy density is 76.16 W h kg−1, the power density reaches 308.65 W kg−1. At a power density of 10.21 kW kg−1, the energy density remains as high as 33.86 W h kg−1. The results presented here may advance the understanding of the issues facing the development of aqueous battery anode materials.