Layered Barium Vanadate Cathodes for Aqueous Zinc Batteries: Enhancing Cycling Stability through Inhibition of Vanadium Dissolution
Shizhou Luo, Xinxin Cao, Qiong Su, Yangpu Zhang, Shengyuan Liu, Xuefang Xie, Shuquan Liang, Anqiang Pan
Abstract
The development of cathode materials has always been the key to improve the performance of aqueous zinc-ion batteries (AZIBs). The issue of cathode material dissolution in aqueous electrolytes is a critical problem that needs urgent attention and exact solutions. In this article, a cathode composed of Ba0.26V2O5·0.92H2O nanobelts has been successfully synthesized. AZIBs using this material as cathode deliver high capacity up to 384.93 mA h g–1 at 0.05 A g–1, owing to the resident cation Ba2+ and crystal water in the vanadium oxygen layers, which enlarge the interlayer distance and improve the ion-migration speed. More importantly, excellent cycle stability and rate performance are achieved because of the formation of the BaSO4 cathode–electrolyte interphase (CEI) film. This film can inhibit the dissolution of V ions effectively.