分离器(采油)
阳极
材料科学
加速度
金属
离子
焊剂(冶金)
图层(电子)
复合材料
冶金
化学
物理
热力学
电极
物理化学
经典力学
有机化学
作者
Yicheng Tan,Duo Chen,Tengyu Yao,Yiming Zhang,Chenglin Miao,Hang Yang,Yuanhang Wang,Li Li,Volodymyr Kotsyubynsky,Wei Han,Laifa Shen
摘要
A large concentration gradient originating from sluggish ion transport on the surface of Zn metal anodes will result in uneven Zn2+ flux, giving rise to severe dendrite growth, especially at high current density. Herein, an ion acceleration layer is introduced by a facile separator engineering strategy to realize modulated Zn2+ flux and dendrite-free deposition. Zinc hexacyanoferrate as the modifying agent featuring strong zincophilicity and rapid diffusion tunnel can enable fast trap for Zn2+ near the electrode surface and immediate transport onto deposition sites, respectively. The ion acceleration effect is substantiated by improved ion conductivity, decreased activated energy, and promoted Zn2+ transference number, which can moderate concentration gradient to guide homogenous Zn2+ flux distribution. As a result, the separator engineering guarantees Zn||Zn symmetrical cells with long-term stability of 2700 h at 2 mA cm−2, and 1770 h at a large current density of 10 mA cm−2. Moreover, cycling stability and rate capability for full cells with different cathodes can be substantially promoted by the modified separator, validating its superior practical feasibility. This study supplies a new scalable approach to tailoring ion flux near the electrode surface to enable robust Zn metal anodes at a high current density.
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