ION-CONDUCTING GLASS CERAMIC HAVING GARNET-LIKE CRYSTAL STRUCTURE

A glass ceramic containing lithium-ions and having a garnet-like main crystal phase having an amorphous proportion of at least 5% is disclosed. The garnet-like main crystal phase preferably has the chemical formula LiMMMMO, wherein Mis a bivalent cation, Mis a trivalent cation, Mis a tetravalent cation, Mis a pentavalent cation. The glass ceramic is prepared by a melting technology preferably within a Skull crucible and has an ion conductivity of at least 5·10S/cm, preferably of at least 1·10S/cm.