Abstract: Provided are: an ion conductive solid which has high ion conductivity and can be produced by a heat treatment at a low temperature; and an all-solid-state battery having the same. Provided are: an ion conductive solid containing an oxide represented by general formula Li6?y?zY1?x?y?zMxZryCezB3O9; and an all-solid-state battery having at least a positive electrode, a negative electrode, and an electrolyte, wherein at least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte includes said ion conductive solid. (In the formula, M is at least one element selected from the group consisting of La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. Moreover, x satisfies 0.005?x?0.800, y satisfies 0.000?y?0.400, z satisfies 0.000?z?0.400, and x, y, and z are real numbers satisfying 0.005?x+y+z.

Abstract: An ion conductive solid that can be produced by heat treatment at low temperature and has a high ion conductivity; and an all-solid-state battery comprising the ion conductive solid, and the ion conductive solid comprising an oxide represented by Formula Li6+x?y?zY1?x?y?zMgxZryCezB3O9, in formula, x is a real number satisfying 0.005?x?0.800, y is a real number satisfying 0.000?y?0.400, z is a real number satisfying 0.000?z?0.400, and x, y, z are real numbers satisfying 0.005?x+y+z<1.000.

Abstract: An ion conductive solid includes an oxide represented by the general formula Li6-x-y-zY1-x-y-zHfxZryCezB3O9, and the solid-state battery has at least a positive electrode, a negative electrode, and an electrolyte, and at least one element of the group consisting of the positive electrode, the negative electrode, and the electrolyte includes the ion conductive solid. (In the formula, x, y, and z are real numbers that satisfy the relationships 0.005?x?0.800, 0.000?y?0.400, 0.000?z?0.400, and 0.005?x+y+z?1.000.

Abstract: An ion conductive solid that can be produced by heat treatment at low temperature and has a high ion conductivity; and an all-solid-state battery comprising the ion conductive solid, and the ion conductive solid comprising an oxide represented by Formula Li6?x?y?zY1?y?zCxZryCezB3?xO9, in formula, x is a real number satisfying 0.010?x?1.500, y is a real number satisfying 0.000?y?0.400, and z is a real number satisfying 0.000?z?0.400.

Abstract: Provided are: an ion-conductive solid which can be produced by heat treatment at a low temperature and which has high ion conductivity; and, an all-solid-state battery having the ion-conductive solid. An ion-conductive solid containing an oxide represented by the general formula Li6-3a-2b-c-dYi1-c-dAlaMgbZrcCedB3O9; and, an all-solid-state battery having at least a positive electrode, a negative electrode, and an electrolyte, at least one element selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte containing the ion-conductive solid (In the formula, a is such that 0.000?a?0.800, b is such that 0.000?b?0.800, c is such that 0.000?c?0.400, d is such that 0.000?d?0.400, and a and b are real numbers satisfying 0.005?a+b?0.800.).