Scientific Achievement
Seven magnesium chalcogenide spinels have been identified as conductors for all-solid-state Mg batteries.
Significance and Impact
Few materials provide the high magnesium mobility at room temperature that is required for solid-state electrolytes as magnesium’s higher charge density leads to strong electrostatic interactions with the host lattice.
Research Details
- MgLn2X4 (Ln = lanthanoid, X = S, Se) spinels are calculated with density functional theory to have low barriers for Mg migration (< 380 meV) and are stable or nearly stable (within 50 meV per atom of stability with respect to competing structures and compositions).
- As the size of the Ln increases, Mg mobility is found to increase, but stability in the spinel structure is found to decrease.
