Toward Ultralong Lifespan Aqueous Zinc-Ion Batteries via Sulfur-Defect Vanadium Tetrasulfide Cathode
Fangfang Wu, Yuxi Wang, Xiaojing Dai, Shibo Meng, Dong Zheng, Ruilian Yin, Wenxian Liu, Wenhui Shi, Xiehong Cao
Abstract
Vanadium sulfide has become one of the promising cathodes of aqueous rechargeable zinc-ion batteries (AZIBs); however, the further application of vanadium sulfides for AZIBs is severely restricted by the limited specific capacity and poor cycling stability. Herein, we synthesize the vanadium tetrasulfide nanosphere with S-defects and coated by an ultrathin carbon layer (D-VS 4 ). The as-assembled Zn//D-VS 4 cell delivers a high specific capacity of 295 mAh g –1 at 0.5 A g –1 and long-time cycling stability (a capacity retention of 72.0% after 8,000 cycles). The electrochemical reaction mechanism of D-VS 4 is revealed. This work provides a significant supplement to the study of vanadium-based sulfides cathode for AZIBs.