| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an all-solid-state lithium ion secondary battery which contains a garnet-type oxide having excellent chemical stability and a wide potential window, and has high conductivity. <P>SOLUTION: The all-solid-state lithium ion secondary battery contains a novel garnet-type oxide serving as a solid electrolyte. The garnet-type oxide is one represented by a composition formula Li<SB>5+X</SB>La<SB>3</SB>(Zr<SB>X</SB>, A<SB>2-X</SB>)O<SB>12</SB>(A is one or more kinds of elements selected from a group composed of Sc, Ti, V, Y, Nb, Hf, Ta, Al, Si, Ga and Ge, and X satisfies 1.4≤X<2), or a garnet-type oxide obtained by substituting an element having an ionic radius different from that of Zr for Zr sites represented by a composition formula Li<SB>7</SB>La<SB>3</SB>Zr<SB>2</SB>O<SB>12</SB>, where intensity after the standardization of (024) diffraction is 9.2 or higher when the intensity of (220) diffraction in an XRD is standardized to one. <P>COPYRIGHT: (C)2011,JPO&INPIT |
