Zhang Zhuojun, Xiao Xu, Yu Wentao, Zhao Zhongxi, Tan Peng
Department of Thermal Science and Energy Engineering, University of Science and Technology of China (USTC), Hefei 230026, Anhui, China.
Nano Lett. 2022 Sep 28;22(18):7527-7534. doi: 10.1021/acs.nanolett.2c02516. Epub 2022 Sep 7.
The unclear LiO distribution inside an air electrode stems from the difficulty of conducting observation techniques inside a porous electrode. In this work, an integrated air electrode is prepared with highly ordered channels. The morphological composition and distribution of LiO inside the real air electrode are clearly observed for the first time. The results show that the toroidal LiO is constrained by the channel size and exhibits a larger diameter on the separator side at high currents. In contrast to the reported single-factor experiments, the coupling effects of charge transfer impedance and concentration polarization on sudden death are analyzed in-depth at low and high currents. The growth model suggests that toroidal LiO exhibits a high dependence on the electrode surface structure. A new route is proposed in which the LiO/electrode interface of a toroid is controlled partially by the second single-electron reduction.
空气电极内部LiO分布不明确，这源于在多孔电极内部进行观测技术存在困难。在这项工作中，制备了具有高度有序通道的集成空气电极。首次清晰地观察到实际空气电极内部LiO的形态组成和分布。结果表明，环形LiO受通道尺寸限制，在高电流下在隔板侧呈现出更大的直径。与已报道的单因素实验不同，在低电流和高电流下深入分析了电荷转移阻抗和浓度极化对突然失效的耦合效应。生长模型表明，环形LiO对电极表面结构高度依赖。提出了一条新途径，其中环形LiO/电极界面部分由第二次单电子还原控制。
