Although the rechargeable lithium–oxygen (Li–O₂) batteries have extremely high theoretical specific energy, the practical application of these batteries is still limited by the instability of their carbon‐based air‐electrode, Li metal anode, and electrodes, toward reduced oxygen species. Here a simple one‐step in situ electrochemical precharging strategy is demonstrated to generate thin protective films on both carbon nanotubes (CNTs), air‐electrodes and Li metal anodes simultaneously under an inert atmosphere. Li–O₂ cells after such pretreatment demonstrate significantly extended cycle life of 110 and 180 cycles under the capacity‐limited protocol of 1000 mA h g⁻¹ and 500 mA h g⁻¹, respectively, which is far more than those without pretreatment. The thin‐films formed from decomposition of electrolyte during in situ electrochemical precharging processes in an inert environment, can protect both CNTs air‐electrode and Li metal anode prior to conventional Li–O₂ discharge/charge cycling, where reactive reduced oxygen species are formed. This work provides a new approach for protection of carbon‐based air‐electrodes and Li metal anodes in practical Li–O₂ batteries, and may also be applied to other battery systems.

中文翻译：

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原位电化学法诱导表面膜保护电极增强锂氧电池的循环性

尽管可再充电锂氧（Li–O ₂）电池具有极高的理论比能，但这些电池的实际应用仍然受到碳基空气电极，锂金属阳极和电极在还原过程中的不稳定性的限制。氧种类。此处展示了一种简单的一步式原位电化学预充电策略，可在惰性气氛下同时在碳纳米管（CNT），空气电极和锂金属阳极上生成薄保护膜。经过这种预处理的Li–O ₂电池在容量限制为1000 mA hg ^-1和500 mA hg ^-1的方案下显示出明显延长的110和180个循环寿命分别比未经预处理的要多得多。在惰性环境中在原位电化学预充电过程中由电解质分解形成的薄膜可以在常规的Li-O ₂放电/充电循环之前保护碳纳米管的空气电极和锂金属阳极，从而形成反应性还原的氧物种。这项工作为保护实际的Li-O ₂电池中的碳基空气电极和Li金属阳极提供了一种新方法，并且也可以应用于其他电池系统。