V2O3 as cathode of zinc ion battery with high stability and long cycling life

• Published in: Ionics 2021-08, Vol.27 (8), p.3393-3402
• Main Authors: Deng, Lie, Chen, Hongzhe, Wu, Jian, Yang, Zhanhong, Rong, Yao, Fu, Zhimin
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Cycles; Diffusion coefficient; Diffusion rate; Discharge; Electrochemical analysis; Electrochemistry; Energy Storage; Environmental protection; Flux density; High temperature; Ion velocity; Molten salts; Optical and Electronic Materials; Original Paper; Rechargeable batteries; Renewable and Green Energy; Stability; Vanadium oxides
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-021-04121-x

Aqueous zinc ion batteries (AZIBs) attract increasing attention due to their low cost, safety, environmental protection, and potential application in stationary energy storage. However, the realization of high discharge voltage, high cycle stability, and high energy density is still the main challenge. Herein, we report a highly stable V 2 O 3 sample synthesized by the reduction method of boron with high-temperature molten salt. In this method, molten salt was used as solvent to react between solid and liquid, and the ion velocity is significantly accelerated; the reaction temperature and time are effectively reduced. The electrochemical performance results show that V 2 O 3 can provide a maximum discharge specific capacity of 207 mAh g −1 at 0.1 A g −1 . The V 2 O 3 electrode exhibits a high specific discharge capacity of 110 mAh g −1 after 2500 cycles at 3 A g −1 ; the capacity retention rate is 82.1%. Its electrochemical performance is obviously better than that of commercial V 2 O 3 . The electrochemical kinetic studies show that V 2 O 3 electrode has a fast diffusion coefficient of zinc ions. This work provides an effective strategy to enhance the energy density and cycling stability of aqueous zinc ion-based batteries.