Abstract: The solid electrolyte according to an embodiment of the present disclosure is represented by the following formula (1): Li7-x-yLa3(Zr2-x-yInxMy)O12??(1) wherein 0.00<x<0.20, 0.20?y<1.50, M is two or more elements selected from the group consisting of Nb, Ta, and Sb.

Abstract: A lithium battery as a secondary battery includes a positive electrode composite material containing a solid electrolyte and a positive electrode active material containing lithium, a negative electrode as an electrode provided at one face of the positive electrode composite material, and a current collector provided at another face of the positive electrode composite material, wherein the solid electrolyte is a garnet-type fluorine-containing lithium composite metal oxide that is represented by the following compositional formula (1) or (2) and that conducts lithium. (Li7?3xGax)(La3?yNdy)Zr2O12?zFz ??(1) (Li7?3x+yGax)(La3?yCay)Zr2O12?zFz ??(2) Provided that 0.1?x?1.0, 0<y?0.2, and 0<z?1.0.

Abstract: A method for producing a solid composition according to the present disclosure includes producing an oxide to be converted into a first functional ceramic by reacting with an oxoacid compound, and mixing the oxide, the oxoacid compound, and a second functional ceramic that is different from the first functional ceramic. The oxoacid compound preferably contains at least one of a nitrate ion and a sulfate ion as an oxoanion.

Abstract: A solid composition according to the present disclosure includes first particles constituted by a first solid electrolyte containing at least lithium, an oxide having a different formulation from the first solid electrolyte, and an oxoacid compound. It is preferred that the oxide and the oxoacid compound are contained in second particles that are different from the first particles. It is preferred that the oxoacid compound contains at least one of a nitrate ion and a sulfate ion as an oxoanion.

Abstract: A method for producing a solid composition according to the present disclosure is a method for producing a solid composition that is used for forming a functional ceramic having a first crystal phase. The method for producing a solid composition includes: producing an oxide composed of a second crystal phase different from the first crystal phase; and mixing the oxide and an oxo acid compound.

Abstract: A solid electrolyte according to the present disclosure is represented by the following compositional formula (1). Li7-2x-zLa3(Zr2-x-zWxMz)O12??(1) In the formula (1), x and z satisfy 0.10?x?0.60 and 0.00<z?0.25, and M is at least one type of element selected from the group consisting of Nb, Ta, and Sb.

Abstract: A solid electrolyte according to the present disclosure is represented by the following compositional formula (1). Li7(La3-xBix)Zr2O12??(1) In the formula (1), x satisfies 0.05<x<0.40.

Abstract: A solid electrolyte according to the present disclosure is represented by the following compositional formula (1). Li7-x(La3-zYz)(Zr2-xMx)O12??(1) In the formula (1), x and z satisfy 0.00<x<1.10, and 0.00<z?0.15, and M is two or more types of elements selected from the group consisting of Nb, Ta, and Sb.

Abstract: A method for producing a solid composition according to the present disclosure is a method for producing a solid composition to be used for forming a solid electrolyte having a first crystal phase, and includes producing an oxide constituted by a second crystal phase that is different from the first crystal phase at normal temperature and normal pressure, and mixing the oxide with an oxoacid compound.

Abstract: A solid electrolyte according to the present disclosure is represented by the following compositional formula (1). Li7-x+y(La3-ySry)(Zr2-xMx)O12??(1) In the formula (1), x and y satisfy 0.20?x<1.50 and 0.00<y<0.30, and M is two or more types of elements selected from the group consisting of Nb, Ta, and Sb.

Abstract: An electrode composite body includes: an active material molded body including active material particles which include a lithium composite oxide and have a particle shape, and a communication hole that is provided between the active material particles; a first solid electrolyte layer that is provided on a surface of the active material molded body, and includes a first inorganic solid electrolyte; and a second solid electrolyte layer that is provided on the surface of the active material molded body, and includes a second inorganic solid electrolyte of which a composition is different from a composition of the first inorganic solid electrolyte, and which contains boron as a constituent element and is crystalline.

Abstract: A composite body includes an electrolyte which contains Li, La, Zr, O, and Ga; and an active material coated with barium titanate (BaTiO3) or lithium niobate (LiNbO3).

Abstract: An electrolyte according to the invention includes a first electrolyte portion, in which one or more types of elements among the elements constituting a crystalline lithium composite metal oxide represented by the compositional formula (1) are substituted with a first metal element having a crystal radius of 78 pm or more, and an amorphous second electrolyte portion, which contains Li and one or more types of second metal elements contained in the first electrolyte portion other than Li. Li7(La3?xNdx)Zr2O12??(1) In the formula, x satisfies the following formula: 0.0<x?0.6.

Abstract: An electrolyte precursor solution includes a metallic compound containing elements constituting an electrolyte, a solvent capable of dissolving the metallic compound, and an anionic surfactant having a sulfate group (SO42?) bonded to a hydrophobic group R. By reacting such an electrolyte precursor solution with active material particles containing lithium, lithium sulfate derived from the anionic surfactant is interposed at the interface between the surface of the active material particle and the electrolyte so as to enhance the dissociation of lithium ions at the interface, and thus, an excellent ion conductivity can be realized.

Abstract: A solid electrolyte coated positive electrode active material powder according to the present disclosure includes: a plurality of particles each having a mother particle formed of a positive electrode active material for a lithium ion secondary battery containing a complex oxide of Li and a transition metal T, and a coating layer formed of a garnet-type solid electrolyte represented by the following Formula (1) and coating at least a part of a surface of the mother particle: Li7-xLa3(Zr2-xMx)O12??(1) (in Formula (1), M represents one or more metal elements selected from Ta, Sb, and Nb, and 0.1?x<0.7).

Abstract: A solid composition according to the present disclosure is a solid composition to be used for forming a functional ceramic having a crystal phase, and contains an oxide constituted by a crystal phase different from the crystal phase of the functional ceramic at normal temperature and normal pressure, and an oxoacid compound. The oxoacid compound preferably contains at least one of a nitrate ion and a sulfate ion as an oxoanion. Further, the oxide preferably has a crystal grain size of 10 nm or more and 200 nm or less.

Abstract: A positive electrode active material composite particle according to the present disclosure includes a base particle constituted by a positive electrode active material containing a lithium composite oxide having a layered crystal structure, and a coating layer that is constituted by a material containing a multiple oxide different from the positive electrode active material, a lithium compound, and an oxoacid compound, and that at least partially coats a surface of the base particle. The oxoacid compound preferably contains at least one of a nitrate ion and a sulfate ion as an oxoanion.

Abstract: A solid electrolyte composite particle according to the present disclosure includes: a mother particle formed of a first solid electrolyte containing at least lithium; and a coating layer formed of a material containing an oxide different from the first solid electrolyte, a lithium compound, and an oxo acid compound, and coating at least a part of a surface of the mother particle. The oxo acid compound may contain at least one of a nitrate ion and a sulfate ion as an oxo anion.

Abstract: A positive electrode active material composite body according to the present disclosure includes a positive electrode active material containing a transition metal element and having a particulate shape, and an ion conductor provided in contact with a surface of the positive electrode active material, wherein the ion conductor is constituted by a material containing Li, Zr, and M which is at least one type of element selected from the group consisting of Nb, Sb, and Ta, the transition metal element is partially diffused in the ion conductor, and an average decrease ratio of a content ratio of the transition metal element until a point where the content ratio of the transition metal element in the ion conductor to be determined by a characteristic X-ray has reached 12% of the content ratio of the transition metal element at an interface between the positive electrode active material and the ion conductor based on a substance amount is 0.5% or more and 6.1% or less per 1 nm thickness from the interface.

Abstract: A solid composition according to the present disclosure is a solid composition for use in forming a solid electrolyte having a crystal phase, containing: at normal temperature and normal pressure, an oxide having a crystal phase different from the crystal phase of the solid electrolyte; a lithium compound; and an oxo acid compound. The oxo acid compound may contain at least one of a nitrate ion and a sulfate ion as an oxo anion.