posted on 2021-06-01, 14:42authored byShizhou Luo, Xinxin Cao, Qiong Su, Yangpu Zhang, Shengyuan Liu, Xuefang Xie, Shuquan Liang, Anqiang Pan
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.