Method for producing lithium lanthanum titanium oxide sintered body, method for producing solid electrolyte containing said oxide, and method for producing lithium-air battery and all-solid lithium battery comprising said solid electrolyte

摘要

A lithium-lanthanum-titanium oxide sintered material has a lithium ion conductivity 3.0 x 10 -4 Scm -1 or more at a measuring temperature of 27 °C, the material is described by one of general formulas (1-a)La x Li 2-3x TiO 3 -aSrTiO 3 , (1-a)La x Li 2-3x TiO 3 -aLa 0.5 K 0.5 TiO 3 , La x Li 2-3x Ti 1-a M a O 3-a , Sr x-1.5a La a Li 1.5-2x Ti 0.5 Ta 0.5 O 3 (0.55 ‰¤ x ‰¤ 0.59, 0 ‰¤ a ‰¤ 0.2, M = at least one of Fe or Ga), amount of Al contained is 0.35 mass% or less as Al 2 O 3 , amount of Si contained is 0.1 mass% or less as SiO 2 , and average particle diameter is 18 µm or more.