Novel aqueous rechargeable nickel//bismuth battery based on highly porous Bi <sub>2</sub> WO <sub>6</sub> and Co <sub>0.5</sub> Ni <sub>0.5</sub> MoO <sub>4</sub> microspheres
Weiwei Kang, Yanan Zhao, Wenqing Zhang, Ying Sun, Xueqin Zhang, Guiyun Yi, Guangxu Huang, Baolin Xing, Chuanxiang Zhang, Baoping Lin
Abstract
Abstract Developing high performances aqueous rechargeable batteries is imperative and valuable. Herein, a novel aqueous rechargeable nickel//bismuth battery is developed based on highly porous Bi 2 WO 6 and Co 0.5 Ni 0.5 MoO 4 microspheres as electrode active materials. Porous Bi 2 WO 6 microspheres assembled from nanosheets as anode active materials can afford a specific capacity of 179.2 mAh·g −1 at 1 A·g −1 , rate capability of 74.7% in 1–20 A·g −1 , and capacity retention of 57.2% for 1500 cycles at 15 A·g −1 . Owing to the highly porous microsphere with ‘ribbon’‐like and intertwined nanolayers morphology, the screened Co 0.5 Ni 0.5 MoO 4 cathode active materials present an outstanding specific surface area of 293 m 2 ·g −1 and excellent electrochemical performance (such as superior specific capacity of 113.2 mAh·g −1 at 1 A·g −1 , high rate performance of 51.8% in 1–15 A·g −1 , and good capacity retention of 48.5% for 4600 cycles at 15 A·g −1 ). The corresponding aqueous rechargeable nickel//bismuth battery delivers the maximum energy density and power density of 35.8 Wh·kg −1 and 3238.5 W·kg −1 , respectively. The present research would offer a worthwhile guidance for the effective construction of electrode active materials for aqueous rechargeable nickel//bismuth batteries.