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Formation of Li2O2 on a dispersed positive electrode material in Li+-containing aprotic electrolytesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Panchenko N.V., Radina M.V., Kulova T.L., Andreev V.N., Bogdanovskaya V.A.
- Журнал: Journal of Electroanalytical Chemistry
- Том: 968
- Год издания: 2024
- Издательство: Elsevier Sequoia
- Местоположение издательства: Switzerland
- Номер статьи: 118485
- DOI: 10.1016/j.jelechem.2024.118485
- Аннотация: To achieve the predicted energy characteristics of the Li–O2 battery (LOB), which are expected to be the highest among known metal-air systems, it is necessary to ensure its long-term cycling at high depth of discharge and high current density. However, in such conditions, the deposition of non-conductive lithium peroxide (Li2O2), a product of LOB discharge, is accelerated on the positive electrode, resulting in the blockage of electronic transport. In this work, using a rotating ring disk electrode (RRDE) in the potentiodynamic regime, the possibility of using CNTs in the active layer (AL) of the positive electrode for long-term LOB discharge in Li+ electrolytes based on DMSO and TEGDME is shown. The direct formation of Li2O2 in the pores of the AL electrode ensures the preservation of a surface fraction that is free of lithium peroxide and accessible for electron transport. The effect of the porous structure is most evident in the DMSO-based electrolyte, which facilitates the formation of Li2O2 on a smooth electrode through the diffusion of the superoxide anion (O2–•) to the solution and its subsequent disproportionation. When oxygen is reduced on the CNTs in the given electrolyte, the formed O2–• is converted to Li2O2 directly in the pores of the AL due to diffusion limitations.
- Добавил в систему: Кулова Татьяна Львовна