%0 Journal Article
%T <br>
%A 刘威
%A 刘艳芳
%A 庄林
%A 王晓晨
%A 王英明
%A 白若鹏
%A 肖丽
%A 陆君涛
%J 物理化学学报
%D 2016
%R 10.3866/PKU.WHXB201510133
%X 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。<br>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
%U http://www.whxb.pku.edu.cn/CN/Y2016/V32/I1/343