An Innovative Bi 12 SiO 20 Multistage Cubic Nanospheres Cathode for High-Performance Bi//Zn Battery

Alkaline Bi//Zn batteries with superb safety, low cost, and high power density are promising candidates for large-scale electrical energy storage. However, their developments are severely limited by the Bi-based cathode as the unsatisfying capacity and cycle life. Herein, an innovative multistage cubic nanospheres Bi SiO (MCS-Bi SiO ) is successfully synthesized by a simple calcination method, which shows excellent energy storage performances of superior specific capacity (294 mAh g at 0.5 A g ) and outstanding rate capability (134 mAh g at 12 A g ). When coupled with Zn anode a superior MCS-Bi SiO //Zn is fabricated, which delivers a high energy density of 247.5 Wh kg at the power density of 375 W kg . Additionally, the MCS-Bi SiO //Zn battery shows excellent cycle life, which reserves more than 100 % of its original capacity after 5000 cycles. Such performance is higher than previously reported Bi//Zn battery and most other Zn batteries. This is the first example of using Bi SiO as cathode for RAZBs, which may provide highly promising material towards better Bi//Zn battery.