期刊
CHEMSUSCHEM
卷 12, 期 10, 页码 2286-2293出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201900225
关键词
batteries; cathode materials; electronic conductivity; MgSc2Se4; solid-state electrolytes
资金
- Federal Ministry for Education and Research Bundesministerium fur Bildung und Forschung (BMBF) of Germany [03XP0032A]
- EU project E-Magic [824066]
- EU
- Deutsche Forschungsgemeinschaft [422053626]
- UCAS Joint Ph.D. Training Program
Recently, the ternary spinel selenide MgSc2Se4 was proposed to have high magnesium ion mobility and is therefore an interesting potential candidate as a solid electrolyte in magnesium secondary batteries. To test the properties of the material, a modified solid-state reaction was used to synthesize pure MgSc2Se4. Electrochemical characterizations identified detrimental high electronic conductivities, which limit its application as a Mg-conducting solid electrolyte. Two methods were attempted to lower electronic conductivities, including the implementation of Se-rich phases and aliovalent doping, however, with no sufficient improvement. Based on the mixed conducting properties of MgSc2Se4, a reversible insertion/extraction of Mg2+ into the spinel structure could be demonstrated.
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