| Autor: |
Li, Canglong, Liao, Tao, Chen, Dongping, You, Tiancheng, Jiang, Xiaozhi, Xu, Minghan, Yu, Huaming, Zhou, Gang, Li, Guanghui, Chen, Yuejiao |
| Zdroj: |
Chinese Chemical Letters; 20240101, Issue: Preprints |
| Abstrakt: |
The insulating nature and dissolution of vanadium-based oxides in aqueous electrolytes result in low capacity and lifespan during charge/discharge process, which is unable to meet the demands for the development and application of high-energy-density aqueous zinc-ion batteries (AZIBs). Herein, a novel V2O5-x@C composite cathode consisting of conductive carbon coatings with abundant oxygen vacancies is specifically designed through plasma-enhanced chemical vapor deposition (PECVD) method. As expected, the ideal microstructure of V2O5-x@C cathode enables large specific surface areas, fast electron/ion diffusion kinetics, and superior interfacial stability, which can realize outstanding cycling stability and electrochemical performance. Consequently, the V2O5-x@C composite cathode delivers a high reversible rate capacity of 130.6 mAh/g at 10 A/g and remains 277.6 mAh/g when returned to 1 A/g. In addition, the Zn//V2O5-x@C full cell can stably cycle for 1000 cycles with a high initial specific capacity of 149.2 mAh/g, possessing 83.8% capacity retention at 5 A/g. The process of constructing a conductive layer on the surface of cathode materials while increasing oxygen vacancies in the structure through PECVD provides new insight into the design of high-performance cathode materials for AZIBs. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full Text from ScienceDirect