The host-framework phonon band-centre, meanwhile, has been used as a descriptor for the electrochemical stability window of Li-ion conductors . The utility of cheapto-compute descriptors within high-throughput computational workflows is illustrated by a study by Muy et al. in which screening against a set of descriptors that included the lithium-ion phonon band-centre was used to predict 18 promising lithium-ion conductors, with one, Li 3 ErCl 6 , then shown to display a high room-temperature ionic conductivity of 0.3 mS cm -1 .