12-冠-4对非质子Li-O2电池氧电极的影响

Li-O₂电池放电产物Li₂O₂由于在有机溶剂中溶解度较差，会堵塞气体通道，这是Li-O₂电池面临的一个主要挑战。在本工作中，我们选择12-冠-4做为添加剂捕获Li⁺，来研究其对氧电极放电产物溶解性的影响，并采用了多种电化学表征方法，包括循环伏安法和旋转圆盘电极等。结果显示，仅仅添加5%的12-冠-4就能明显提高氧还原产物$\text{O}_{2}^{-}$的稳定性，并减少固体Li₂O₂的生成。结合软硬酸碱和第一性原理计算对上述实验结果进行了解释。

Influence of 12-Crown-4 on Oxygen Electrode of Aprotic Li-O2 Battery

One of the major challenges with Li-O₂ batteries is that the discharge product, Li₂O₂, blocks the gas pathway because of its poor solubility in aprotic solvents. In this work, 12-crown-4 ether was used as an additive to capture Li⁺, and its influence on the solubility of the discharge products of the oxygen electrode was investigated. Multiple electrochemical methods, including cyclic voltammetry and rotating-ring disk electrode, were used. The results show that the addition of only 5% of 12-crown-4 ether significantly improves the stability of the oxygen reduction product $\text{O}_{2}^{-}$, and decreases the formation of solid Li₂O₂. We used a combination of the hard-soft-acid-base theory and ab initio calculations to explain these observations.