Dynamic Locking of Interfacial Side Reaction Sites Promotes Aluminum-Air Batteries Close to Theoretical Capacity,Advanced Sustainable Systems

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Dynamic Locking of Interfacial Side Reaction Sites Promotes Aluminum-Air Batteries Close to Theoretical Capacity
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2021-12-29 , DOI: 10.1002/adsu.202100420
Yuanlin Huang ₁ , Lei Fang ₁ , Yu Gu ₁ , Pingshi Wang ₁ , Hao Yan ₁ , Yanjie Wang ₁ , Zexing Cao ₁ , Zhaowu Tian ₁ , Bingwei Mao ₁ , Li Zhang ₁

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Aluminum metal has been regarded as a promising anode material for aqueous metal-air batteries. However, the stable cycling of Al anodes is challenging due to the severe parasitic corrosion of Al metal in alkaline electrolytes. Here, a novel additive, n-octylphosphonic acid (OPA), is introduced into the typical NaOH electrolyte system to improve the interfacial stability of Al anodes and thus promote high-performance Al-air batteries (AABs). Combining several experimental characterizations and theoretical calculation, it is proved that OPA molecules in an NaOH aqueous environment can modify the Al anode/electrolyte interface and alter the stacking of the discharge product. The electrolyte engineering is capable of anchoring dynamically to restrain side reactions through hydrogen bonds (H···O), homogenizing the dissolution of Al metal and avoiding precipitation agglomeration. As a proof of concept, AABs full cells with an electrolyte containing OPA achieve higher potential plateau and discharge capacity than those with a pure NaOH electrolyte. It paves a way to develop highly-efficient and eco-friendly electrolyte additive strategies for high-performance AABs devices and advance the current understanding of organic additive mechanisms in AABs.

中文翻译：

界面侧反应位点的动态锁定促进铝空气电池接近理论容量

金属铝被认为是一种很有前途的水性金属-空气电池负极材料。然而，由于铝金属在碱性电解质中的严重寄生腐蚀，铝阳极的稳定循环具有挑战性。这里，一种新型添加剂，n-辛基膦酸 (OPA) 被引入典型的 NaOH 电解质体系中，以提高铝负极的界面稳定性，从而促进高性能铝空气电池 (AABs)。结合多项实验表征和理论计算，证明了 NaOH 水环境中的 OPA 分子可以改变铝阳极/电解质界面并改变放电产物的堆积。电解质工程能够通过氢键（H···O）动态锚定抑制副反应，使Al金属的溶解均匀，避免沉淀团聚。作为概念验证，使用含有 OPA 的电解液的 AAB 完整电池比使用纯 NaOH 电解液的电池具有更高的电势平台和放电容量。

更新日期：2021-12-29

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