Journal
MATERIALS TODAY PHYSICS
Volume 14, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtphys.2020.100242
Keywords
Aluminum-air battery; Organic anolyte; Metal-air electrochemical cell; Self-corrosion; Acidic catholyte
Funding
- General Research Fund of the Research Grants Council of Hong Kong Special Administrative Region, China [17206518, 17206519]
- HKU-Zhejiang Institute of Research and Innovation (HKU-ZIRI)
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The aluminum-air battery with remarkably high theoretical energy density is a promising candidate for the increasingly diverse applications in modern society. However, the self-corrosion of Al is one great challenge and limits the practical operating voltage around 1.2-1.6 V. Here, a trielectrolyte aluminum-air cell (TEAAC) is first developed to integrate polymer ion-exchange membranes, organic electrolyte, alkaline anolyte, and acidic catholyte, reaching an open-circuit voltage of 2.2 V, which is among the highest reported values for Al-air cells. The adoption of organic alkaline anolytes maintains fairly good electrochemical activity of aluminum while significantly suppressing the self-corrosion reaction. The acid-base neutralization is avoided with proper arrangement of two ion-selective membranes. The TEAAC demonstrates stable and robust performance through long-time discharge tests and shows good mechanical rechargeability. The new cell design also allows usage of low-cost commercial-grade aluminum. This work provides an alternative route for cost-effective and reliable Al-air battery systems. (C) 2020 Elsevier Ltd. All rights reserved.
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