| 摘要 |
PROBLEM TO BE SOLVED: To restore, in a solid electrolyte ceramic material having a lithium ion conductivity which consists of oxide synthetic powder or an oxide sintered compact having a garnet type or garnet-like type crystal structure constituted by at least Li, La, Zr and O, the ion conductivity having lowered to under that immediately after synthesis or sintering.SOLUTION: A method comprises: performing a thermal treatment in a temperature region of no lower than 650°C on a ceramic material with its ion conductivity having lowered to under that immediately after the synthesis of oxide synthetic powder or the sintering of an oxide sintered compact under at least one kind of atmosphere selected from an inert gas atmosphere, an oxygen atmosphere and a decompression atmosphere. |
