Critical role of elemental copper for enhancing conversion kinetics of sulphur cathodes in rechargeable magnesium batteries

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Lee, Boeun; Choi, Jihwan; Na, Subin; Yoo, Dong-Joo; Kim, Jong Hak; Cho, Byung Won; Kim, Yong-Tae; Yim, Taeeun; Choi, Jang Wook; Oh, Si Hyoung

Issue Date
Elsevier BV
Applied Surface Science, Vol.484, pp.933-940
Despite recent remarkable progress associated with the electrolyte, understanding of the reaction mechanism of magnesium-sulphur batteries is not yet mature. In particular, the lethargic redox reactions involved in the electrochemical conversion of sulphur and MgS in the cathode need to be overcome. Here, we unveil the reaction mechanism involving copper (Cu) metal, a common current collector for electrodes in rechargeable batteries. Specifically, Cu can undergo chemical reactions with polysulphides produced from the reaction of sulphur or MgS with Mg2+. Throughout the conversion reaction, these Cu-polysulphide reactions play a critical role to improve reaction kinetics markedly. The present investigation opens new avenues to the emerging Mg-S battery technology, that is, the incorporation of various metals that can speed up the conversion reaction between sulphur and Mg.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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