A Sieve-Functional and Uniform-Porous Kaolin Layer toward Stable Zinc Metal Anode
A Sieve-Functional and Uniform-Porous Kaolin Layer toward Stable Zinc Metal Anode
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筛子——功能性和均匀性——多孔高岭土层走向稳定的锌金属阳极
DOI：
10.1002/adfm.202000599
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发表时间：
2020-05-01
影响因子：
19
通讯作者：
Liang, Shuquan
中科院分区：
文献类型：
--
作者：
Deng, Canbin;Xie, Xuesong;Liang, Shuquan
金属锌由于其高比容量、丰富性和安全性而被认为是可再充电水性锌基电池的最佳阳极选择之一。然而，枝晶和腐蚀问题仍然是该系统的挑战。在此，提出了高岭土涂层锌阳极（KL-Zn）的筛元功能（Zn 2+的选择性通道）和均匀的孔分布（约3.0 nm），以缓解这些问题。基于人工Zn金属/电解质界面，KL-Zn阳极不仅确保了无枝晶沉积和长期稳定性（在1.1 mA h cm（-2）下800 h），而且还抑制了副反应。因此，KL-Zn/MnO 2电池可以提供高的比容量和良好的容量保持率，以及在0.5 A g（-1）下600次循环后保持相当良好的形态（KL-Zn）。该工作为高性能可充电锌基电池系统的开发迈出了重要一步。
Zinc metal is considered as one of the best anode choices for rechargeable aqueous Zn-based batteries due to its high specific capacity, abundance, and safety. However, dendrite and corrosion issues remain a challenge for this system. Herein, sieve-element function (selective channel of Zn2+) and uniform-pore distribution (approximate to 3.0 nm) of a kaolin-coated Zn anode (KL-Zn) is proposed to alleviate these problems. Based on the artificial Zn metal/electrolyte interface, the KL-Zn anode not only ensures dendrite-free deposition and long-time stability (800 h at 1.1 mA h cm(-2)), but also retards side reactions. As a consequence, KL-Zn/MnO2 batteries can deliver high specific capacity and good capacity retention as well as a reasonably well-preserved morphology (KL-Zn) after 600 cycles at 0.5 A g(-1). This work provides a deep step toward high-performance rechargeable Zn-based battery system.