Owing to the exceptionally high energy potential of lithium–oxygen chemistry, lithium–air batteries have received much attention as appealing alternatives to current state-of-art lithium ion batteries. However, owing to the presence of non-O₂ components in ambient air, the practical performance of Li–air batteries is limited to only a few cycles with low energy efficiency. In particular, when CO₂ is incorporated into the battery system, Li₂CO₃ is formed during discharging, which results in serious climbing of the charge potential and subsequent decomposition of the cell components. Herein, by introducing an appropriate electrolyte into an aggregated contact ion pair (CIP) structure, we demonstrate a Li–O₂/CO₂ battery, via formation of stabilized peroxodicarbonate (C₂O₆²⁻) rather than Li₂CO₃ in the electrolyte, that operates with a very low charge potential (3.5 V). We anticipate that this discovery will provide a rational design strategy for modifying the reaction pathway of Li–O₂/CO₂ battery and accelerating the evolution of Li–O₂ batteries to Li–air batteries.

中文翻译：

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不含 Li ₂ CO _3的Li–O ₂ / CO ₂电池，带有过氧化物放电产物†

由于锂-氧化学物质具有极高的能量潜力，锂-空气电池作为当前最先进的锂离子电池的吸引人的替代品受到了广泛关注。但是，由于周围空气中存在非O ₂成分，因此锂空气电池的实际性能仅限于能源效率低的几个循环。特别地，当将CO ₂结合到电池系统中时，在放电期间形成Li ₂ CO ₃，这导致充电电势的严重爬升并随后使电池组件分解。本文中，通过将适当的电解质引入聚集接触离子对（CIP）结构中，我们证明了Li–O ₂ / CO通过在电解液中形成稳定的过二碳酸酯（C ₂ O ₆ ^2-）而不是Li ₂ CO ₃来形成₂电池，该电池在极低的充电电位（3.5 V）下工作。我们预计，这一发现将为修改Li–O ₂ / CO ₂电池的反应路径并加速Li–O ₂电池向Li–air电池的演进提供合理的设计策略。