Charge Rate-Dependent Decomposition Mechanism of Toroidal Li_(2)O_(2)in Li-O_(2)Batteries
在 Li-O2 电池控告 Toroidal Li2O2 的率依赖者分解机制作者机构：CAS Key Laboratory of Molecular Nanostructure and NanotechnologyCAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Science(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing100190 China University of Chinese Academy of SciencesBeijing100049 China
出 版 物：《Chinese Journal of Chemistry》 (中国化学（英文版）)
年 卷 期：2021年第39卷第10期
页 面：2668-2672页
核心收录：
基 金：support from the National Key R&D Program of China(Grant Nos.2016YFA0202500 and 2016YFB0100100) the National Nature Science Fund for Excellent Young Scholars(Grant No.21722508)
主 题：Li-0_(2)Batteries Scanning probe microscopy Toroidal Li_(2)0_(2) Oxidation Structure-activity relationships
摘 要：Main observation and conclusion Using in situ atomic force microscopy,we visualized the oxidation dynamic process of toroidal lithium peroxide(Li_(2)O_(2))in a working Li-O2 battery and clarified the correlation between the decomposition behavior and the charging *** was found that at a low charge rate,the decomposition could occur at the Li_(2)O_(2)/electrolyte interface,providing strong evidence that a tiny current is allowed to pass through the bulk phase of toroidal Li_(2)O_(2).Further,the evolution of the periphery thickness,diameter and center thickness of the toroid as a function of charge capacity was quantitatively *** the early stage of charging,the diameter of the toroid radially shrinks and the shrinking rate slows down in the later ***,the periphery thickness of the toroid decreases at a faster and uniform rate,while the center thickness decreases obviously in the later stage of *** the charging rate promotes the decomposition occurring at the Li_(2)O_(2)/electrode interface,causing direct desorption of the Li_(2)O_(2)from the electrode and irreversible capacity degradation.
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