ECS Meeting Abstracts | 2021
Elucidating Ionic Mobility in Multivalent Spinel Oxides
Abstract
With lithium-ion batteries seemingly reaching their developmental limits, researchers are exploring new chemistries to obtain the higher energy densities needed for electric vehicles to become more competitive for universal market adoption. Batteries based on Mg chemistries could achieve these goals. Oxides with a spinel structure are predicted to provide a favorable combination of properties to function as attractive magnesium cathodes; however, traditionally, Mg2+ intercalation suffers from sluggish mobility. Theory has predicted the energy barriers for the Mg2+ hops between tetrahedral sites via the vacant octahedral sites are low enough to enable sufficient room temperature transport. Experimental studies have shown potential Mg2+ migration at comparable timescales. While the activation barriers could be extracted, the path followed by the Mg2+ cation during a hop remains to be elucidated.