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High Room-Temperature Magnesium Ion Conductivity in Spinel-Type MgYb2Se4 Solid Electrolyte
Clarissa Glaser1, Mohsen Sotoudeh2, Manuel Dillenz2
1Institute of Physical Chemistry and Center for Materials Research (ZfM), Justus Liebig University Giessen, Heinrich-Buff-Ring 17, Giessen 35392, Germany.
Chemistry of Materials : a Publication of the American Chemical Society
|May 19, 2025
Summary
Three novel magnesium selenide spinels show promise as solid electrolytes for magnesium batteries. MgYb2Se4 demonstrates high ionic conductivity and low ion migration barriers, making it a strong candidate for advanced battery applications.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- Magnesium batteries are a promising alternative to lithium-ion batteries due to magnesium's abundance and high volumetric capacity.
- Developing efficient and stable solid electrolytes (SEs) is crucial for advancing magnesium battery technology.
- Existing magnesium selenide spinels require further optimization for high ionic conductivity and electrochemical stability.
Purpose of the Study:
- To synthesize and characterize novel magnesium selenide spinels as potential solid electrolytes for magnesium batteries.
- To investigate the ionic conductivity, Mg2+ migration barriers, and electrochemical stability of these new materials.
- To explore the relationship between material structure, ion insertion energy, and ionic mobility using theoretical calculations.
Main Methods:
- Synthesis of three magnesium selenide spinels: MgSc0.4Y0.4Er0.4Tm0.4Yb0.4Se4, Mg0.75Sc2Se3.5Br0.5, and MgYb2Se4.
- Measurement of room-temperature ionic conductivity.
- Density Functional Theory (DFT) calculations to determine Mg2+ migration barriers and insertion energies.
- Electrochemical stability window determination.
Main Results:
- MgYb2Se4 exhibited a room-temperature ionic conductivity exceeding 10^-4 S cm^-1.
- A low Mg2+ migration barrier of 364 meV was observed for MgYb2Se4, attributed to weak Mg-lattice interactions.
- All presented spinels showed lower electronic conductivity than previously studied MgB2Se4 spinels and good electrochemical stability.
Conclusions:
- MgYb2Se4 is a highly promising solid electrolyte candidate for magnesium batteries due to its superior ionic conductivity and low Mg2+ migration barrier.
- The investigated magnesium selenide spinels offer a viable pathway for developing safer and more efficient magnesium battery systems.
- DFT insights into ion migration mechanisms can guide the design of next-generation solid electrolytes.
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