| abstract |
The present invention relates to an aluminum-doped lithium ion conductor based on a garnet structure, comprising lanthanum, in particular aluminum-doped lithium lanthanum zirconate (LLZO), wherein the lithium ion conductor/lithium lanthanum zirconate is bonded to the lanthanum site. At least one trivalent ion M 3+ co-doping, wherein the trivalent ion M 3+ has an ionic radius smaller than La 3+ , and there is a higher lithium content compared to the stoichiometric garnet structure, provided that, When M 3+ is yttrium, an additional trivalent ion, M 3+ , is co-doped on the lanthanum sites, which additional trivalent ion is different from Y 3+ and has an ionic radius smaller than that of La 3+ . A co-doping strategy was performed in which doping with ions of the same valence but smaller diameters on the lanthanum sites induces changes in lattice geometry, resulting in cubic variants. This leads to the stabilization of the cubic variant, which exists even in the presence of superstoichiometric amounts of lithium. |