PDF(Pubmed)
Abstract：
The undesirable dendrite growth induced by non-planar zinc (Zn) deposition and low Coulombic efficiency resulting from severe side reactions have been long-standing challenges for metallic Zn anodes and substantially impede the practical application of rechargeable aqueous Zn metal batteries (ZMBs). Herein, we present a strategy for achieving a high-rate and long-cycle-life Zn metal anode by patterning Zn foil surfaces and endowing a Zn-Indium (Zn-In) interface in the microchannels. The accumulation of electrons in the microchannel and the zincophilicity of the Zn-In interface promote preferential heteroepitaxial Zn deposition in the microchannel region and enhance the tolerance of the electrode at high current densities. Meanwhile, electron aggregation accelerates the dissolution of non-(002) plane Zn atoms on the array surface, thereby directing the subsequent homoepitaxial Zn deposition on the array surface. Consequently, the planar dendrite-free Zn deposition and long-term cycling stability are achieved (5,050 h at 10.0 mA cm-2 and 27,000 cycles at 20.0 mA cm-2). Furthermore, a Zn/I2 full cell assembled by pairing with such an anode can maintain good stability for 3,500 cycles at 5.0 C, demonstrating the application potential of the as-prepared ZnIn anode for high-performance aqueous ZMBs.
摘要：
由非平面锌(Zn)沉积引起的不期望的枝晶生长和由严重副反应导致的低库仑效率一直是金属Zn阳极的挑战,并且基本上阻碍了可再充电的水性Zn金属电池(ZMB)的实际应用。在这里，我们提出了一种通过图案化Zn箔表面并在微通道中赋予Zn-铟（Zn-In）界面来实现高速率和长循环寿命Zn金属阳极的策略。电子在微通道中的积累和Zn-In界面的锌亲合性促进了微通道区域中的优先异质外延Zn沉积，并增强了电极在高电流密度下的耐受性。同时,电子聚集加速非(002)面Zn原子在阵列表面的溶解，从而在阵列表面上引导后续的同质外延Zn沉积。因此,实现了平面无枝晶的Zn沉积和长期循环稳定性（在10.0mAcm-2时为5,050小时，在20.0mAcm-2时为27,000次循环）。此外，通过与这种阳极配对组装的Zn/I2全电池可以在5.0C下保持良好的稳定性3,500次循环，证明了所制备的ZnIn阳极在高性能水性ZMBs中的应用潜力。
