NaCl–AlCl <sub>3</sub>熔体与液态Ga负极之间的稳定界面，可实现长寿命固定式铝离子储能电池,ACS Applied Materials & Interfaces

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NaCl–AlCl ₃熔体与液态Ga负极之间的稳定界面，可实现长寿命固定式铝离子储能电池
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-03-19 , DOI: 10.1021/acsami.9b21809
Junxiang Wang ₁ , Handong Jiao ₂ , Wei-Li Song ₂ , Mingyong Wang ₁ , Jiguo Tu ₁ , Zhongfeng Tang ₃ , Hongmin Zhu ₁

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基于中温NaCl–AlCl ₃的Al离子电池由于其低成本，高安全性等优点而被认为是有前途的固定式储能系统。但是，这种廉价的电解质具有关键特性，即强腐蚀，因此传统的铝金属阳极的循环寿命短，并且还限制了基于NaCl–AlCl ₃的Al离子电池的发展。非腐蚀性电解质可能是解决上述挑战的好选择，而难于获得兼具非腐蚀性和低成本优势的电解质。因此，在这里，我们报告了在可负担的NaCl–AlCl _3中的Ga-金属阳极电解质，用于构建长寿命的固定式Al离子储能系统。这种具有特色的液态金属阳极在金属Ga和Al之间显示出良好的合金化和脱合金工艺，并且使电解质与阳极之间的界面具有出色的稳定性（例如，在2 mA cm ^{–2的条件下}平稳运行580小时以上）。在这种新颖的液体/液体界面中出现了无腐蚀和无粉化问题。这些优点表明，液态Ga-金属阳极对于改进用于大型固定式储能应用的NaCl-AlCl ₃基Al-离子电池具有广阔的前景。

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Stable Interface between a NaCl–AlCl3 Melt and a Liquid Ga Negative Electrode for a Long-Life Stationary Al-Ion Energy Storage Battery

Intermediate temperature NaCl–AlCl₃-based Al-ion batteries are considered as a promising stationary energy storage system due to their low cost, high safety, etc. However, such a cheap electrolyte has a critical feature, i.e., strong corrosion, which results in the short cycle life of the conventional Al-metal anode and also limits the development of the NaCl–AlCl₃-based Al-ion batteries. A noncorrosive electrolyte may be a good choice for addressing the above challenge, while it is difficult to obtain the electrolyte that has advantages of both noncorrosion and low cost. Therefore, here, we report a Ga-metal anode in the affordable NaCl–AlCl₃ electrolyte for constructing a long-life stationary Al-ion energy storage system. This featured liquid metal anode shows good alloying and dealloying processes between metallic Ga and Al, as well as renders superior stability of the interface between the electrolyte and the anode (e.g., smoothly running for over 580 h at 2 mA cm^–2). No-corrosion and no-pulverization problems appear in this novel liquid/liquid interface. Those advantages demonstrate that the liquid Ga-metal anode has a great promise for the improvement of the NaCl–AlCl₃-based Al-ion batteries for large-scale stationary energy storage applications.

更新日期：2020-03-20

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