材料科学
寿命
石墨烯
钒
锌
氧化物
异质结
化学工程
氧化钒
空位缺陷
氧气
纳米技术
无机化学
光电子学
化学
冶金
有机化学
结晶学
老年学
工程类
医学
作者
Zheng Chen,Zi‐Hang Huang,Fangfang Sun,Yue Zhang,Hui Li,Yongxin Liu,Tianyi Ma
出处
期刊:Small
[Wiley]
日期:2023-09-29
卷期号:20 (6)
被引量:5
标识
DOI:10.1002/smll.202306275
摘要
Vanadium trioxide (V6 O13 ) cathode has recently aroused intensive interest for aqueous zinc-ion batteries (AZIBs) due to their structural and electrochemical diversities. However, it undergoes sluggish reaction kinetics and significant capacity decay during prolonged cycling. Herein, an oxygen-vacancy-reinforced heterojunction in V6 O13-x /reduced graphene oxide (rGO) cathode is designed through electrostatic assembly and annealing strategy. The abundant oxygen vacancies existing in V6 O13-x weaken the electrostatic attraction with the inserted Zn2+ ; the external electric field constructed by the heterointerfaces between V6 O13-x and rGO provides additional built-in driving force for Zn2+ migration; the oxygen-vacancy-enriched V6 O13-x highly dispersed on rGO fabricates the interconnected conductive network, which achieves rapid Zn2+ migration from heterointerfaces to lattice. Consequently, the obtained 2D heterostructure exhibits a remarkable capacity of 424.5 mAh g-1 at 0.1 A g-1 , and a stable capacity retention (96% after 5800 cycles) at the fast discharge rate of 10 A g-1 . Besides, a flexible pouch-type AZIB with real-life practicability is fabricated, which can successfully power commercial products, and maintain stable zinc-ion storage performances even under bending, heavy strikes, and pressure condition. A series of quantitative investigation of pouch batteries demonstrates the possibility of pushing pouch-type AZIBs to realistic energy storage market.
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