Journal article

Authors list: Glaser, Clarissa; Wei, Zhixuan; Indris, Sylvio; Klement, Philip; Chatterjee, Sangam; Ehrenberg, Helmut; Zhao-Karger, Zhirong; Rohnke, Marcus; Janek, Jürgen

Publication year: 2023

Journal: Advanced Energy Materials

Volume number: 13

Issue number: 40

ISSN: 1614-6832

eISSN: 1614-6840

Open access status: Hybrid

DOI Link: https://doi.org/10.1002/aenm.202301980

Publisher: Wiley

Abstract: 
Magnesium batteries offer promising potential as next-generation sustainable energy-storage solutions due to the high theoretical capacity of the magnesium metal anode. Facilitating dendrite-free operation of metal anodes necessitates the development of solid electrolytes with high magnesium-ion conductivity. While the chalcogenide spinel MgSc2Se4 is predicted to exhibit high magnesium ion mobility, unequivocal experimental evidence for magnesium ion conduction beyond short-range motion is still missing. This study confirms magnesium-ion transport in MgSc2Se4 through two independent electrochemical methods: electrochemical deposition of magnesium metal and reversible magnesium plating/stripping cycling. To overcome the difficulty of measuring the ionic conductivity of the mixed conducting MgSc2Se4 spinel, a pure ion conducting interlayer is employed in a symmetric transference cell. This approach effectively suppresses the electron transport, allowing accurate characterization of the ionic conductivity. The experimental results confirm a low migration barrier of (386 +/- 24) meV for magnesium ion transport in MgSc2Se4 and demonstrate one of the best performances at room temperature among the reported inorganic magnesium solid electrolytes. The findings open a new door for exploring additional mixed magnesium ion conductors and highlight the potential of magnesium chalcogenide spinels as a promising class of magnesium solid electrolytes.

Harvard Citation style: Glaser, C., Wei, Z., Indris, S., Klement, P., Chatterjee, S., Ehrenberg, H., et al. (2023) To be or not to be - Is MgSc2Se4 a Mg-Ion Solid Electrolyte?, Advanced Energy Materials, 13(40), Article 2301980. https://doi.org/10.1002/aenm.202301980

APA Citation style: Glaser, C., Wei, Z., Indris, S., Klement, P., Chatterjee, S., Ehrenberg, H., Zhao-Karger, Z., Rohnke, M., & Janek, J. (2023). To be or not to be - Is MgSc2Se4 a Mg-Ion Solid Electrolyte?. Advanced Energy Materials. 13(40), Article 2301980. https://doi.org/10.1002/aenm.202301980