Singlet Oxygen in Lithium−Oxygen Batteries,Batteries & Supercaps

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Singlet Oxygen in Lithium−Oxygen Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-11-17 , DOI: 10.1002/batt.202000210
Misun Hong ₁ , Hye Ryung Byon _{2,

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Affiliation

Singlet oxygen (¹O₂) is one of the most critical species leading to parasitic side reactions and poor reversibility in non‐aqueous Li−O₂ batteries. ¹O₂ is generated via the disproportionation of the superoxide radical (O₂^.−) in O₂/Li₂O₂ electrochemistry. The mechanistic and computational studies on ¹O₂ formation revealed the significant roles of the associated cations, solvation ability of aprotic solvents, H⁺ source, and catalyst/electrode materials. Along with efforts to alleviate ¹O₂ production, trapping and eliminating ¹O₂ have been attempted using molecular agents. Anthracene derivatives trap ¹O₂ and form endoperoxides, which can be quantitatively detected using in situ fluorescence analysis. Physical quenchers that convert ¹O₂ to ³O₂ are desirable for cycling of Li−O₂ cells because quencher molecules are reusable. We highlight the recent reports on the formation and elimination of ¹O₂, and challenges and perspectives of suppressing the ¹O₂ effect on the performance of Li−O₂ cells.

中文翻译：

锂氧电池中的单重态氧

单线态氧（¹ O ₂）是导致非水Li-O ₂电池中寄生副反应和不良可逆性的最关键物质之一。通过O ₂ / Li ₂ O ₂电化学中超氧自由基（O ₂^.-）的歧化产生¹ O ₂。对¹ O ₂形成的机理和计算研究表明，相关阳离子的重要作用，非质子溶剂的溶剂化能力，H ⁺源和催化剂/电极材料。努力减轻¹ O已经尝试使用分子试剂来产生_2种，捕获和消除¹ O ₂。蒽衍生物捕获¹ O ₂并形成内过氧化物，可使用原位荧光分析法定量检测。转换¹ O ₂到³ O _2的物理淬灭剂对于Li-O ₂电池的循环是理想的，因为淬灭剂分子是可重复使用的。我们重点介绍了有关¹ O ₂形成和消除的最新报告，以及抑制¹ O _2的挑战和观点。对Li-O ₂电池性能的影响。

更新日期：2020-11-17

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