Manipulating the ion-transfer kinetics and interface stability for high-performance zinc metal anodes,Energy & Environmental Science

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Manipulating the ion-transfer kinetics and interface stability for high-performance zinc metal anodes
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019/12/21 , DOI: 10.1039/c9ee03545a
Xuesong Xie _{1,

2,

3,

4} , Shuquan Liang _{1,

2,

3,

4} , Jiawei Gao _{1,

2,

3,

4} , Shan Guo _{1,

2,

3,

4} , Jiabao Guo _{1,

2,

3,

4} , Chao Wang _{5,

6,

7,

8} , Guiyin Xu _{5,

6,

7,

8} , Xianwen Wu _{4,

9,

10,

11} , Gen Chen _{1,

2,

3,

4} , Jiang Zhou _{1,

2,

3,

4}

Affiliation

The zinc metal is recognized as one of the most promising anodes for Zn-based batteries in an energy-storage system. However, the deposition and transfer of bivalent Zn²⁺ into the host structure suffer from sluggish kinetics accompanying the side-reactions at the interface. Herein, we report a new class of Zn anodes modified by a three-dimensional (3D) nanoporous ZnO architecture coating on a Zn plate (designated as Zn@ZnO-3D) prepared by in situ Zn(OH)₄²⁻ deposition onto the surface. This novel structure has been proven to accelerate the kinetics of Zn²⁺ transfer and deposition via the electrostatic attraction toward Zn²⁺ rather than the hydrated one in the electrical double layer. As a consequence, it achieves an average 99.55% Zn utilization and long-time stability for 1000 cycles. Meanwhile, the Zn@ZnO-3D/MnO₂ cell shows no capacity fading after 500 cycles at 0.5 A g⁻¹ with a specific capacity of 212.9 mA h g⁻¹. We believe that the mechanistic insight into the kinetics and thermodynamic properties of the Zn metal and the understanding of structure–interface–function relationships are very useful for other metal anodes in aqueous systems.

中文翻译：

操纵高性能锌金属阳极的离子转移动力学和界面稳定性

锌金属被认为是储能系统中锌基电池最有希望的阳极之一。然而，二价Zn ²⁺的沉积和转移到主体结构中的过程伴随着界面处的副反应而动力学缓慢。本文中，我们报道了一种通过在原位上将Zn（OH）₄^2-沉积到Zn板上的三维（3D）纳米多孔ZnO建筑涂层（称为Zn @ ZnO-3D）修饰的新型Zn阳极。表面。事实证明，这种新颖的结构可通过对Zn ²⁺的静电吸引来加速Zn ²⁺转移和沉积的动力学。而不是双电层中的水合层。结果，它实现了平均99.95％的Zn利用率和1000次循环的长期稳定性。同时，Zn @ ZnO-3D / MnO ₂电池在0.5 A g ^-1下的500次循环后没有显示容量衰减，比容量为212.9 mA hg ^-1。我们认为，对于锌金属的动力学和热力学性质的机械分析以及对结构-界面-功能关系的理解对于水性系统中的其他金属阳极非常有用。

更新日期：2020-02-19

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