considering ternary and quaternary structures taken from a database that contain Mg, oxygen and a transition metal. Thus two cathode materials are found that lead to a much higher open-circuit potential than the Chevrel phase which is considered to be the prototype cathode material for Mg-ion batteries . Still, these high-voltage materials are also A similar workflow has also been used in a computational screening study restricted to perovskites materials, but taken the possible charge carriers Li, Na, K, Mg, Ca, Zn, and Al into account . Thus in total 280 different perovskite compounds were tested. Determining first energy densities volume changes and the energy above, only 13 compounds survived as promising candidates for which the diffusion barriers were determined, resulting then in three remaining candidates that might be used in post-Li battery technologies with multivalent ions and which require further investigation.