A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode,Advanced Functional Materials

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A Sieve‐Functional and Uniform‐Porous Kaolin Layer toward Stable Zinc Metal Anode
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-03-16 , DOI: 10.1002/adfm.202000599
Canbin Deng ₁ , Xuesong Xie ₁ , Junwei Han ₂ , Yan Tang _{1,

3} , Jiawei Gao ₁ , Cunxin Liu ₁ , Xiaodong Shi ₁ , Jiang Zhou _{1,

3} , Shuquan Liang _{1,

3}

Affiliation

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 (≈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.

中文翻译：

稳定锌金属阳极的筛功能均匀多孔高岭土层

锌金属由于其高的比容量，丰度和安全性，被认为是可充电水性Zn基电池的最佳阳极选择之一。但是，枝晶和腐蚀问题仍然是该系统的挑战。为了缓解这些问题，本文提出了筛元素功能（Zn ^2+的选择性通道）和高岭土包覆的锌阳极（KL-Zn）的均匀孔分布（≈3.0nm）。KL-Zn阳极基于人工锌金属/电解质界面，不仅可确保无枝晶沉积和长期稳定性（在1.1 mA h cm ^-2时为800 h ），而且还可以延迟副反应。结果，KL‐Zn / MnO ₂在0.5 A g ^-1下循环600次后，电池可以提供高比容量和良好的容量保持率，以及合理保存良好的形态（KL-Zn）。这项工作为高性能的可充电锌基电池系统迈出了坚实的一步。

更新日期：2020-03-16

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