溶剂化
法拉第效率
阳极
锌
水溶液
化学
化学工程
离子
单独一对
无机化学
电极
物理化学
分子
有机化学
工程类
作者
Mingqiang Wu,Yilun Sun,Zimin Yang,Siting Deng,Hui Tong,Xinbin Nie,Yifan Su,Jianwei Li,Guoliang Chai
标识
DOI:10.1002/anie.202407439
摘要
Abstract The reversibility and stability of aqueous zinc‐ion batteries (AZIBs) are largely limited by water‐induced interfacial parasitic reactions. Here, dimethyl(3,3‐difluoro‐2‐oxoheptyl)phosphonate (DP) is introduced to tailor primary solvation sheath and inner‐Helmholtz configurations for robust zinc anode. Informed by theoretical guidance on solvation process, DP with high permanent dipole moments can effectively substitute the coordination of H 2 O with charge carriers through relatively strong ion‐dipolar interactions, resulting in a water‐lean environment of solvated Zn 2+ . Thus, interfacial side reactions can be suppressed through a shielding effect. Meanwhile, lone‐pair electrons of oxygen and fluorinated features of DP also reinforce the interfacial affinity of metallic zinc, associated with exclusion of neighboring water to facilitate reversible zinc planarized deposition. Thus, these merits endow the Zn anode with a high‐stability performance exceeds 3800 hours at 0.5 mA cm −2 and 0.5 mAh cm −2 for Zn||Zn batteries and a high average Coulombic efficiency of 99.8 % at 4 mA cm −2 and 1 mAh cm −2 for Zn||Cu batteries. Benefiting from the stable zinc anode, the Zn||NH 4 V 4 O 10 cell maintains 80.3 % of initial discharge capacity after 3000 cycles at 5 A g −1 and exhibits a high retention rate of 99.4 % against to the initial capacity during the self‐discharge characterizations.
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