材料科学
阳极
法拉第效率
锌
电镀(地质)
水溶液
基质(水族馆)
电偶阳极
普鲁士蓝
化学工程
金属
枝晶(数学)
电极
电化学
冶金
阴极保护
化学
有机化学
物理化学
几何学
工程类
地质学
海洋学
数学
地球物理学
作者
Dan Deng,Kai Fu,Ruohan Yu,Jinsheng Zhu,Hongwei Cai,Xiangchen Zhang,Jinsong Wu,Wen Luo,Liqiang Mai
标识
DOI:10.1002/adma.202302353
摘要
Metallic zinc is an ideal anode for aqueous energy storage; however, Zn anodes suffer from nonhomogeneous deposition, low reversibility, and dendrite formation; these lead to an overprovision of zinc metal in full cells. Herein, oriented-attachment-regulated Zn stacking initiated through a trapping-then-planting process with a high zinc utilization rate (ZUR) is reported. Due to the isometric topology features of cubic-type Prussian blue analog (PBA), the initial Zn plating occurs at specific sites with equal spacing of ≈5 Å in the direction perpendicular to the substrate; the trace amount of zinc ions trapped in tunnel matrix provides nuclei for the oriented attachment of Zn (002) deposits. As a result, the PBA-decorated substrate delivers high reversibility of dendrite-free zinc plating/stripping for more than 6600 cycles (1320 h) and achieves an average Coulombic efficiency (CE) of 99.5% at 5 mA cm-2 with 100% ZUR. Moreover, the anode-limited full cell with a low negative-positive electrode ratio (N/P) of 1.2 can be operated stably for 360 cycles, displaying an energy density of 214 Wh kg-1 ; this greatly exceeds commercial aqueous batteries. This work provides a proof of concept design of metal anodes with a high utilization ratio and a practical method for developing high-energy-density batteries.
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