Evaluation of components of Li-O2 battery positive electrode capacitance by a voltammetric method

Авторы: Korchagin Oleg V., Bogdanovskaya Vera A., Tripachev Oleg V.
Журнал: Journal of Electroanalytical Chemistry
Том: 920
Год издания: 2022
Издательство: Elsevier Sequoia
Местоположение издательства: Switzerland
Номер статьи: 116547
DOI: 10.1016/j.jelechem.2022.116547
Аннотация: In the present work, the capacitance of a positive electrode based on CNTOH is addressed. The variations in its double-layer (CDL) and pseudocapacitance (CPC) components were evaluated using cyclic voltammetry during testing lithium-oxygen battery (LOB). A decrease in CDL during the discharge process is established, equal to 64 %, 26 %, and 12 % of the initial value at current densities of 100, 200, and 500 mA gC-1, respectively. The behavior of the CDL values and maximum discharge capacity under various current densities indicates that the oxygen concentration polarization affects the discharge characteristics of LOB. This influence exceeds the effect of blocking the positive electrode surface by the products formed in the cathode process. During LOB cycling, a decrease in the maximum discharge capacity correlates with a reduction in CDL, possibly, due to corrosion of the carbon material. An increase in CPC with prolonged cycling is explained by the accumulation of side products formed during discharging and charging.
Добавил в систему: Корчагин Олег Вячеславович

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