Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 9, Pages 10776-10785Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c01482
Keywords
aqueous zinc-ion batteries; V-polydopamine; VNxOy/C; nanospheres; cathodes
Funding
- National Key R&D Program of China [2017YFE0198100]
- National Natural Science Foundation of China [21975250]
- Open Funds of the State Key Laboratory of Rare Earth Resource Utilization [RERU2021004]
- Open Project Program of Key Laboratory of Preparation and Application of Environmental Friendly Materials (Jilin Normal University) , Ministry of Education, China [2021007]
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In this study, a cathode material VNxOy/C derived from a self-assembled V-polydopamine complex via a one-step organic-inorganic hybrid reaction is designed. It exhibits excellent electrochemical performances including enhanced rate capability and cycling stability in aqueous zinc-ion batteries.
While vanadium oxides have garnered interest due to their high capacity and abundant valence states in aqueous zinc-ion batteries (AZIBs), there are many challenges to achieving long cycling stability and excellent rate capability resulting from poor electronic conductivity and sluggish reaction dynamics. Herein, we design a cathode material VNxOy/C derived from a self-assembled V-polydopamine complex via a one-step organic-inorganic hybrid reaction. Benefiting from a well-organized structure and nanosized particle embedding, the asprepared VNxOy phase could favor zinc-ion insertion/extraction due to the strong affinity of N element with Zn2+. Systematic investigations show that the controllable strategy yields positive effects on the electrochemical performances including enhanced rate capability and cycling stability, which are superior to those of the V2O3/C cathode. As a result, we have achieved fast charging/discharging capability at 10 A g(-1) and stability exceeding 700 cycles at 3 A g(-1) with nearly 100% Coulombic efficiency. Interestingly, the pouch-cell-like devices with similar to 24 mAh could light an LED effectively. This work may pave the way to obtaining highly active V-containing compounds with structure design to improve electrochemical performances of AZIBs.
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