锌
氢铵
电化学
水溶液
阴极
电解质
材料科学
插层(化学)
氧化钒
钒
储能
无机化学
化学工程
离子
化学
电极
冶金
热力学
有机化学
工程类
功率(物理)
物理化学
物理
作者
Lulu Wang,Kuo‐Wei Huang,Jitao Chen,Junrong Zheng
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2019-10-04
卷期号:5 (10)
被引量:474
标识
DOI:10.1126/sciadv.aax4279
摘要
Rechargeable aqueous zinc-ion batteries are promising candidates for large-scale energy storage but are plagued by the lack of cathode materials with both excellent rate capability and adequate cycle life span. We overcome this barrier by designing a novel hierarchically porous structure of Zn-vanadium oxide material. This Zn0.3V2O5·1.5H2O cathode delivers a high specific capacity of 426 mA·h g-1 at 0.2 A g-1 and exhibits an unprecedented superlong-term cyclic stability with a capacity retention of 96% over 20,000 cycles at 10 A g-1. Its electrochemical mechanism is elucidated. The lattice contraction induced by zinc intercalation and the expansion caused by hydronium intercalation cancel each other and allow the lattice to remain constant during charge/discharge, favoring cyclic stability. The hierarchically porous structure provides abundant contact with electrolyte, shortens ion diffusion path, and provides cushion for relieving strain generated during electrochemical processes, facilitating both fast kinetics and long-term stability.
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