Abstract 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.

中文翻译：

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具有高稳定性和电压超过 2.2 V 的三电解质铝/空气电池

摘要 具有极高理论能量密度的铝空气电池是现代社会日益多样化的应用前景的候选者。然而，铝的自腐蚀是一个巨大的挑战，将实际工作电压限制在 1.2-1.6 V 左右。在这里，首先开发了一种三电解质铝空气电池（TEAAC），将聚合物离子交换膜、有机电解质、碱性阳极电解液和酸性阴极电解液，达到 2.2 V 的开路电压，这是铝空气电池报告的最高值之​​一。采用有机碱性阳极电解液，在保持铝的良好电化学活性的同时，显着抑制了自腐蚀反应。两个离子选择性膜的适当布置避免了酸碱中和。通过长时间放电测试，TEAAC 表现出稳定和稳健的性能，并显示出良好的机械可充电性。新的电池设计还允许使用低成本的商业级铝。这项工作为具有成本效益且可靠的铝空气电池系统提供了替代途径。