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MgSc 2 Se 4 —A Magnesium Solid Ionic Conductor for All‐Solid‐State Mg Batteries?
Author(s) -
Wang LiPing,
ZhaoKarger Zhirong,
Klein Franziska,
Chable Johann,
Braun Tobias,
Schür Annika R.,
Wang ChunRu,
Guo YuGuo,
Fichtner Maximilian
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201900225
Subject(s) - spinel , selenide , solid solution , electrolyte , materials science , ternary operation , fast ion conductor , magnesium , electrochemistry , inorganic chemistry , ionic conductivity , doping , ionic bonding , solid state , chemical engineering , ion , chemistry , metallurgy , electrode , selenium , optoelectronics , computer science , organic chemistry , engineering , programming language
Recently, the ternary spinel selenide MgSc 2 Se 4 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 MgSc 2 Se 4 . 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 MgSc 2 Se 4 , a reversible insertion/extraction of Mg 2+ into the spinel structure could be demonstrated.