| abstract |
The invention relates to an aluminum-doped lithium ion conductor based on a garnet structure, comprising lanthanum, in particular an aluminum-doped lithium lanthanum zirconate (LLZO), wherein the latter is co-doped with at least one trivalent M 3+ ion on the lanthanum site, wherein the trivalent M 3+ ion has an ionic radius that is smaller than that of La 3+ , and a higher lithium content is present in comparison to a stoichiometric garnet structure, with the provision that if M 3+ nis yttrium, a further trivalent M 3+ nion, which is different than Y 3+ nand has an ionic radius that is smaller than that of La 3+ n, is co-doped on the lanthanum site. A co-doping strategy is carried out, in which a doping on the lanthanum site with ions of the same valence, but smaller diameter brings about the change in the lattice geometry to the cubic modification. This leads to a stabilization of the cubic crystal modification that is present also with superstoichiometric quantities of lithium. |