To mitigate a global crisis of Li depletion, potassium-based rechargeable batteries have received significant attention because of their low cost and high specific energy density. In particular, the rechargeable potassium oxygen (K–O₂) battery has been recognized as a promising energy storage technology because of its low overpotential and high round-trip efficiency based on the single-electron redox chemistry of potassium superoxide. Despite these merits, research on the development of K–O₂ batteries is still in its early stages owing to a lack of understanding of the fundamental reaction chemistry and the difficulties encountered in handling, in terms of practical acceptability. Hence, it is necessary to summarize the representative works and provide overall insights on K–O₂ batteries and recommendations for future studies. In this Perspective, we critically review the important scientific aspects of K–O₂ batteries, discuss the current challenges encountered, and provide recommendations from the scientific and practical points of view. We hope that this Perspecitve will be helpful in designing innovative and advanced K–O₂ batteries.

中文翻译：

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钾氧电池：意义，挑战和前景。

为了减轻全球锂耗尽的危机，钾基可充电电池因其低成本和高比能量密度而受到了广泛关注。尤其是，可充电钾氧（K-O ₂）电池基于过氧化钾的单电子氧化还原化学原理具有较低的过电位和较高的往返效率，因此被认为是一种有前途的储能技术。尽管有这些优点，但由于缺乏对基本反应化学的理解以及在实际可接受性方面的处理方面的困难，因此对K-O ₂电池的开发研究仍处于早期阶段。因此，有必要总结代表性作品并提供有关K–O的整体见解₂电池和未来研究的建议。在此观点中，我们将审视K-O ₂电池的重要科学方面，讨论当前遇到的挑战，并从科学和实践角度提出建议。我们希望这个观点对设计创新和先进的K-O ₂电池有所帮助。