Comprehensive understanding of the roles of water molecules in aqueous Zn-ion batteries: from electrolytes to electrode materials,Energy & Environmental Science

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Comprehensive understanding of the roles of water molecules in aqueous Zn-ion batteries: from electrolytes to electrode materials
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-5-11 , DOI: 10.1039/d1ee00030f
Ming Li _{1,

2,

3,

4} , Zilan Li _{1,

2,

3,

4} , Xuanpeng Wang _{2,

3,

4,

5,

6} , Jiashen Meng _{1,

2,

3,

4} , Xiong Liu _{1,

2,

3,

4} , Buke Wu _{4,

7,

8,

9} , Chunhua Han _{1,

2,

3,

4} , Liqiang Mai _{1,

2,

3,

4,

10}

Affiliation

Benefiting from loose assembly conditions, a high level of safety and environmentally friendly characteristics, rechargeable aqueous Zn-ion batteries (AZIBs) have attracted significant attention. The electrochemical kinetics and performance of the AZIBs are greatly affected by water in electrolytes or electrode materials. The corrosion and passivation of the Zn electrode caused by the inevitable solvation process of water molecules can lead to the growth of dendrites, thus resulting in a limited cycle life. Moreover, water in the electrode material, whether in the form of structural water or co-intercalated hydrated cations, can greatly affect the electrochemical behavior due to its small size, high polarity and hydrogen bonding. Unlike previous reports, this review focuses on the roles of water molecules during electrochemical processes in AZIBs. We comprehensively summarize the influencing mechanisms of water molecules during the energy storage process from the perspectives of the electrolyte, Zn anode, and cathode materials, and further include the basic theory, modification methods, and practical applications. The mystery concerning the water molecules and the electrochemical performance of AZIBs is revealed herein, and we also propose novel insights and actionable methods regarding the potential future directions in the design of high-performance AZIBs.

中文翻译：

全面了解水分子在水性Zn离子电池中的作用：从电解质到电极材料

得益于宽松的组装条件，高度的安全性和环保特性，可再充电的水性Zn离子电池（AZIBs）引起了广泛的关注。电解质或电极材料中的水会极大地影响AZIBs的电化学动力学和性能。由于水分子不可避免的溶剂化过程而引起的Zn电极的腐蚀和钝化会导致枝晶的生长，从而导致有限的循环寿命。而且，电极材料中的水，无论是结构水还是共插入的水合阳离子的形式，由于其小尺寸，高极性和氢键，都可以极大地影响电化学行为。与以前的报告不同，本综述重点介绍了水分子在AZIBs电化学过程中的作用。我们从电解质，锌阳极和阴极材料的角度全面总结了水分子在储能过程中的影响机理，并包括了基本理论，改性方法和实际应用。本文揭示了与水分子和AZIBs的电化学性能有关的奥秘，我们还就高性能AZIBs的潜在未来方向提出了新颖的见解和可行的方法。

更新日期：2021-05-19

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