To provide an all-solid type lithium secondary battery which excels in chemical stability and has a large potential window and can, further, enhance lithium ionic conductivity and can reduce the interface resistance between a solid electrolyte and a negative electrode.
The all-solid type lithium secondary battery adopts a new garnet-type oxide as a solid electrolyte, and has the negative elctrode, including a lithium alloy which contains at least 1 or larger designated elements from among Mg, Al, Si, In, Ag, and Sn. The garnet type oxide is represented either with a composition formula of Li5+XLa3(ZrX'A2-X)O12 (in the formula, A is one kind or more elements selected from among a group of Sc, Ti, V, Y, Nb, Hf, Ta, Al, Si, Ga, and Ge, and X has a relation: 1.4≤X<2 ), or is a garnet-type oxide, wherein a Zr site of a composition formula of Li7La3Zr2O12 replaced by an element having an ionic radius different from that of Zr. The intensity after standardizing the (024) diffraction is 9.2 or more, when the intensity of the (220) diffraction in XRD is normalized to 1.
KOBAYASHI TETSUO
ASAOKA MASAHIKO
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