材料科学
电解质
阳极
化学工程
离子电导率
离子键合
水溶液
离子
聚合物
枝晶(数学)
聚合
离子运输机
电极
有机化学
复合材料
化学
物理化学
工程类
几何学
数学
作者
Yanglansen Cui,Wei-Peng Chen,Weiwen Xin,Haoyang Ling,Yuhao Hu,Zhehua Zhang,Xiaofeng He,Yong Zhao,Xiang‐Yu Kong,Liping Wen,Lei Jiang
标识
DOI:10.1002/adma.202308639
摘要
Abstract The quasi‐solid electrolytes (QSEs) attract extensive attention due to their improved ion transport properties and high stability, which is synergistically based on tunable functional groups and confined solvent molecules among the polymetric networks. However, the trade‐off effect between the polymer content and ionic conductivity exists in QSEs, limiting their rate performance. In this work, the epitaxial polymerization strategy is used to build the gradient hydrogel networks (GHNs) covalently fixed on zinc anode. Then, it is revealed that the asymmetric distribution of negative charges benefits GHNs with fast and selective ionic transport properties, realizing a higher Zn 2+ transference number of 0.65 than that (0.52) for homogeneous hydrogel networks (HHNs) with the same polymer content. Meanwhile, the high‐density networks formed at Zn/GHNs interface can efficiently immobilize free water molecules and homogenize the Zn 2+ flux, greatly inhibiting the water‐involved parasitic reactions and dendrite growth. Thus, the GHNs enable dendrite‐free stripping/plating over 1000 h at 8 mA cm −2 and 1 mAh cm −2 in a Zn||Zn symmetric cell, as well as the evidently prolonged cycles in various full cells. This work will shed light on asymmetric engineering of ion transport channels in advanced quasi‐solid battery systems to achieve high energy and safety.
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