Journal of The Electrochemical Society · 1989 · 472 citations · 0 references
Natural SciencesChemistryMaterials ScienceInorganic ChemistryMaterials ChemistrySolid-state ChemistryBattery MaterialsInorganic MaterialsIon-conducting MaterialsIonic ConductivityIonic ConductorsSolid ElectrolytesCeramic Solid ElectrolytesCrystal Structure-property RelationshipsIonic Conduction In CrystalsLithium-ion ConductivityLithium-ion ConductorsOxide Solid ElectrolytesSolid-state Ionic ConductivityTitanium Oxides
High lithium ionic conductivity was obtained in Li/sub 1+X/M/sub X/Ti/sub 2-X/(PO/sub 4/)/sub 3/ (M=Al, Sc, Y, and La) systems. Lithium titanium phosphate, LiTi/sub 2/(PO/sub 4/)/sub 3/, is composed of both TiO/sub 6/ octahedra and PO/sub 4/ tetrahedra, which are linked by corners to form a three dimensional network, with a space group R3-barC. Some workers have already described that the conductivity increased considerably if Ti/sup 4+/ in LiTi/sub 2/(PO/sub 4/)/sub 3/ was substituted by slightly larger cations such as Ga/sup 3+/(1),Sc/sup 3+/(2), and In/sup 3+/(3,4). These results are similar to each other because of their close ionic radii. In this communication, substitution effects of Ti/sup 4+/ in LiTi/sub 2/(PO/sub 4/)/sub 3/ by various ions (Al/sup 3+/, Sc/sup 3+/, Y/sup 3+/, and La/sup 3+/) on their conductivities are reported.