Stimulating Cu–Zn alloying for compact Zn metal growth towards high energy aqueous batteries and hybrid supercapacitors,Energy & Environmental Science

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Stimulating Cu–Zn alloying for compact Zn metal growth towards high energy aqueous batteries and hybrid supercapacitors
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-05-09 , DOI: 10.1039/d2ee00617k
Minhyung Kwon _{1,

2} , Jina Lee ₁ , Sunghyun Ko ₃ , Gukhyun Lim _{4,

5} , Seung-Ho Yu ₂ , Jihyun Hong ₄ , Minah Lee ₁

Affiliation

Aqueous Zn-ion batteries (AZIBs) ensure unparalleled safety for large-scale energy storage applications. However, developing highly reversible zinc metal anodes with finite capacity is a prerequisite to realizing the performance characteristics of AZIBs comparable to those of commercial batteries. Herein, we address this issue by identifying the growth mechanism of densely packed micrometer-sized Zn particles on Cu foil to construct a stable anode with a proper Zn loading for AZIBs. Using various characterization techniques, we demonstrate that deep eutectic solvents activate an unusual Cu–Zn alloying reaction to produce a Zn-rich alloy interlayer that is zincophilic and isotypic to the pure Zn phase. This alloy layer, in turn, forms compact Zn deposits of which structure can endure continuous cycling in an aqueous electrolyte, effectively preventing AZIB corrosion and swelling. Owing to the high reversibility of the Zn anode with a Cu–Zn alloy interlayer, the AZIB utilizing more than 25% Zn from the compact anode lasts over 7000 cycles, confirming the possibility of constructing AZIBs with competitive energy densities.

中文翻译：

刺激 Cu-Zn 合金化以实现致密 Zn 金属向高能水系电池和混合超级电容器的生长

水系锌离子电池 (AZIB) 确保了大规模储能应用的无与伦比的安全性。然而，开发具有有限容量的高度可逆的锌金属负极是实现 AZIB 与商用电池相当的性能特征的先决条件。在此，我们通过确定铜箔上紧密堆积的微米级 Zn 颗粒的生长机制来解决这个问题，从而为 AZIBs 构建具有适当 Zn 负载量的稳定阳极。使用各种表征技术，我们证明深共晶溶剂会激活不寻常的 Cu-Zn 合金化反应，以产生富锌合金中间层，该中间层亲锌且与纯 Zn 相同型。反过来，该合金层形成致密的锌沉积物，其结构可以承受水电解质中的连续循环，有效防止AZIB腐蚀和膨胀。由于具有 Cu-Zn 合金夹层的 Zn 阳极具有高可逆性，利用紧凑阳极中超过 25% 的 Zn 的 AZIB 持续超过 7000 次循环，证实了构建具有竞争能量密度的 AZIB 的可能性。

更新日期：2022-05-09

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