钒
材料科学
氮化钒
阴极
无机化学
氧化钒
电解质
储能
化学工程
插层(化学)
阳离子聚合
氮化物
电极
纳米技术
化学
物理化学
冶金
高分子化学
热力学
功率(物理)
工程类
物理
图层(电子)
作者
Duo Chen,Mengjie Lu,Boran Wang,Ruiqing Chai,La Li,Dong Cai,Hang Yang,Bingke Liu,Yupu Zhang,Wei Han
标识
DOI:10.1016/j.ensm.2020.12.001
摘要
Vanadium-based cathodes for zinc-ion batteries (ZIBs) hold a great promise for next-generation energy storage systems due to their amazing diversity, relatively high capacity and excellent stability. Unfortunately, the specific capacity of current vanadium-based electrodes is intrinsically limited by zinc site density in crystal structures, probably attributing to the ignore of exception energy storage mechanism in cationic insertion/extraction. Herein, a new energy storage mechanism in the vanadium oxide-based ZIB system via cationic conversion reactions was demonstrated for the first time. At the force of electric and weak acid conditions, the oxygen-doped vanadium nitride (O-VN) cathode was firstly electrochemically oxidized into vanadium oxide and vanadium cations via in-situ activation; the cations would be reduced to V2O3 that depositing on the surface of the electrode in the discharge process; and subsequently the V (III) species could be oxidized back to the cations dissolving into electrolyte upon charging. First-principle density functional theory (DFT) calculations confirm the reversible characteristics of these reactions. Owing to these cationic conversion reactions together with contributions from zinc ion de/intercalation, the O-doped VN cathode delivered an ultrahigh discharge capacity of 705 mAh g−1 at 0.2 A g−1. This work continues to develop the energy storage mechanism of vanadium-based cathode and reveals the arrival of a new era for high-capacity ZIBs.
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