Kinetics of oxygen reaction and discharge/charging overvoltages of Li-O2 battery with aprotic electrolytes

Оleg V. Коrchagin, Vera А. Bogdanovskaya, Оleg V. Tripachev, Viktor V. Emets

Index: 10.1016/j.elecom.2018.03.005

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Abstract

The measurement method is suggested and kinetic curves of the oxygen reaction are obtained for the first time on highly dispersed XC-72 and 20Pt/XC-72 active materials in lithium-containing aprotic electrolytes based on DMSO and TEGDME. The relationship between the kinetic overvoltage of the oxygen reaction and discharge/charging overvoltage are studied in a Li-O2 battery. It is found that the catalyst does not affect either the oxygen reduction kinetics or the Li-O2 battery discharge overvoltage. At the same time, the charging overvoltage of a Li-O2 battery with the catalyst is found to be lower than that of a Li-O2 battery with the carbon material. It is shown that the latter effect is maybe more related to the structural changes of the cathode reaction product than to electrocatalysis of the oxygen evolution reaction.