Li–O₂ batteries with ultrahigh theoretical energy density have been regarded as a promising successor to Li-ion batteries for next-generation energy storage. However, their practical application is still facing many critical issues, especially the lack of suitable electrolytes that can tolerate a strong oxidizing environment as well as being compatible with a Li metal anode. Here, we design a new N,N-dimethylacetamide (DMA)-based electrolyte by regulating the Li⁺ solvation structure under medium concentration to promote the cycling stability of Li–O₂ batteries. And it is also a better lithium metal anode stabilization strategy than using high concentration electrolytes. In contrast to high concentration electrolytes with expensive cost, limited protection ability toward the Li anode, sluggish kinetics and slow mass transfer, this new electrolyte with intrinsic better endurance towards the rigorous oxidative species can simultaneously stabilize the Li anode by facilitating the formation of a LiF and LiN_xO_y coexisting solid electrolyte interphase (SEI) film and enable faster kinetics/mass transfer. As a result, both the symmetrical batteries (1800 hours) and the Li–O₂ batteries (180 cycles) achieve the best cycling performances in DMA-based electrolytes to our knowledge. This study breathes new life into the electrolyte regulation strategy and paves the way for the development of alkali–O₂ batteries.

中文翻译：

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N，N-二甲基乙酰胺基电解质的复兴，以促进Li-O2电池的循环稳定性

具有超高理论能量密度的Li-O ₂电池已被认为是用于下一代能量存储的锂离子电池的有前途的替代产品。然而，它们的实际应用仍面临许多关键问题，特别是缺乏合适的电解质，它们不能耐受强氧化环境以及与锂金属阳极相容。在这里，我们通过调节中等浓度下的Li ⁺溶剂化结构来提高Li–O ₂的循环稳定性，设计了一种新的基于N，N-二甲基乙酰胺（DMA）的电解质电池。与使用高浓度电解质相比，它也是一种更好的锂金属阳极稳定策略。与昂贵的高浓度电解质，昂贵的对Li阳极的保护能力，缓慢的动力学和缓慢的传质相反，这种对苛刻的氧化物质具有固有更好耐受性的新型电解质可以通过促进LiF的形成同时稳定Li阳极。与LiN _x O _y共存的固体电解质相间（SEI）膜，可以实现更快的动力学/质量转移。结果，对称电池（1800小时）和Li–O ₂据我们所知，电池（180次循环）在基于DMA的电解液中实现了最佳的循环性能。这项研究为电解质调节策略注入了新的活力，并为碱金属O ₂电池的开发铺平了道路。