期刊
CHEMICAL ENGINEERING JOURNAL
卷 446, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137266
关键词
Vanadium nitride; Graphene oxide; Cathode materials; Spray pyrolysis; Zinc-ion batteries
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2020R1A4A2002854]
This study introduces the synthesis of uniquely structured porous VN-rGO microspheres and their application as cathodes for ZIBs. The VN-rGO microspheres exhibit high capacity, high energy density, and good rate capability. The electro-chemical reaction mechanism of VN-rGO microspheres with zinc ions is investigated.
Aqueous zinc-ion batteries (ZIBs) are receiving considerable research highlights owing to their high safety and environment-friendliness. To implement this promising technology for grid-scale energy storage, effective cathode materials with high capacity, cycle stability, and electrochemical kinetics should be developed. Herein, the synthesis of uniquely structured porous VN-reduced graphene oxide composite (VN-rGO) microspheres through a facile spray pyrolysis process and their application as cathodes for ZIBs are introduced. The electro-chemical reaction mechanism of VN-rGO microspheres with zinc ions is investigated through various in situ and ex situ analyses. During the initial charge process, VN phase transforms into the Zn-3(OH)(2)V2O7.2H(2)O (ZVOH) phase. From the second cycle and on, the ZVOH phase undergoes zinc-ion ingress and egress processes. VN-rGO microspheres exhibit an unprecedented high capacity (809 mA h g(-1) at 0.1 A g-1), high energy density (613 W h kg(-1)), and good rate capability (467 mA h g(-1) at 2.0 A g(-1)). The cathode delivers a reversible capacity of 445 mA h g(-1) after 400 cycles at 1.0 A g(-1), which ascertains the robustness of the structure. The 3D porous rGO matrix to which VN nanocrystals are homogenously anchored accelerates the zinc-ion storage kinetics and en-dows the cathode with structural robustness.
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