Novel aqueous rechargeable nickel//bismuth battery based on highly porous Bi2WO6 and Co0.5Ni0.5MoO4 microspheres

Developing high performances aqueous rechargeable batteries is imperative and valuable. Herein, a novel aqueous rechargeable nickel//bismuth battery is developed based on highly porous Bi2WO6 and Co0.5Ni0.5MoO4 microspheres as electrode active materials. Porous Bi2WO6 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 Co0.5Ni0.5MoO4 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.