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Changes in double layer capacitance of the positive electrode in Li-O2 battery during discharge: Effect of active material and aprotic electrolyte solventстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
- Авторы: Korchagin Oleg V., Bogdanovskaya Vera A., Tripachev Oleg V.
- Журнал: Journal of Electroanalytical Chemistry
- Том: 948
- Год издания: 2023
- Издательство: Elsevier Sequoia
- Местоположение издательства: Switzerland
- Номер статьи: 117815
- DOI: 10.1016/j.jelechem.2023.117815
- Аннотация: Changes in the double-layer capacitance of a positive electrode (CDL) are investigated during the discharge of alithium-oxygen battery (LOB) having various carbon materials (CM), including XC-72, Super P, EC-300 J, andCNT, and electrolytes based on tetraglyme and DMSO, containing 0.1 M LiClO4. It is shown that the initial valueof CDL increases proportionally to the external surface area of the carbon material in both the tetraglyme- andDMSO-based electrolyte. The difference between the CDL values in these electrolytes can be explained by thedifferent wetting abilities of the solvents, as well as the ability of the DMSO medium to dissolve the binder(PVDF). During the LOB discharge, a decrease in CDL is observed, which is associated with increasing passivationof the positive electrode with lithium peroxide (Li2O2)). The highest (Li2O2) value (0.5–0.7) is observed for XC-72and EC-300 J carbon black having the lowest average pore size (9 and 8 nm, respectively) among the studiedmaterials. Nonetheless, no pronounced dependence of (Li2O2) on the nature of a solvent was observed underidentical measurement conditions. Along with blocking the surface with lithium peroxide, oxygen transportlimitations have a significant impact on the discharge process, which is most pronounced for large-pore CMs(Super P and CNT). Even at a relatively low (Li2O2) (from 0.15 to 0.24), the voltage of such LOBs decreases to 2V. The results demonstrate that the initial parameter CDL of the active material can be used as a new criterion forpre-selection the electrolyte for LOB.
- Добавил в систему: Корчагин Олег Вячеславович