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[sbnd]S battery technology, that is, the incorporation of various metals that can speed up the conversion reaction between sulphur and Mg.
Bibliographical noteFunding Information:
This work was supported by the institutional program (2E29641)of the Korea Institute of Science and Technology and grants from the National Research Foundation of Korea (NRF-2011-C1AAA001-0030538, NRF-2017R1A6A1A06015181 (T.Y), NRF-2018R1A2A1A19023146 (J.W.C)). There are no conflicts to declare.
© 2019 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Surfaces, Coatings and Films