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 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 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 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 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: 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 amorphous.

Abstract: A manufacturing method of an electrode assembly capable of easily manufacturing a configuration in which an electrolyte and an active material are bonded to each other. A step of supplying, solidifying, and crystallizing a solid electrolyte including Li2+XC1?XBXO3 (X represents a real number equal to or greater than 0 and smaller than 1), so as to be in contact with an active material aggregate including a communication hole between active material particles, is included. In a case where the solid electrolyte is melted, the solid electrolyte is heated in a range of 650 degrees to 900 degrees.

Abstract: A manufacturing method of an electrode assembly capable of easily manufacturing a configuration in which an electrolyte and an active material are bonded to each other is provided. A step of supplying, solidifying, and crystallizing a solid electrolyte 22 including Li2+XC1?XBXO3 (X represents a real number equal to or greater than 0 and smaller than 1), so as to be in contact with an active material aggregate 12 including a communication hole 14 between active material particles 13, is included. In a case where the solid electrolyte 22 is melted, the solid electrolyte 22 is heated in a range of 650 degrees to 900 degrees.

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: 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 amorphous.

Abstract: An electrode complex includes: a complex which includes a porous active material molded body which is formed by being three-dimensionally connected with a plurality of particulate active material particles containing a lithium double oxide and a plurality of particulate noble metal particles containing a noble metal with a melting point of 1000° C. or higher and includes a communication hole, and a solid electrolyte layer formed on the surface of the active material molded body containing the communication hole of the active material molded body; and a current collector which is provided by being bonded to the active material molded body on one surface of the complex.

Abstract: A manufacturing method of an electrode assembly capable of easily manufacturing a configuration in which an electrolyte and an active material are bonded to each other. A step of supplying, solidifying, and crystallizing a solid electrolyte including Li2+XC1?XBXO3 (X represents a real number equal to or greater than 0 and smaller than 1), so as to be in contact with an active material aggregate including a communication hole between active material particles, is included. In a case where the solid electrolyte is melted, the solid electrolyte is heated in a range of 650 degrees to 900 degrees.

Abstract: A manufacturing method of an electrode assembly includes forming an active material molded body which contains lithium double oxide and includes plural voids, forming a solid electrolyte in the plural voids, and attaching a polymer gel film impregnated with an electrolytic solution for conducting lithium ions to the active material molded body in which the solid electrolyte is formed.

Abstract: A manufacturing method of an electrode assembly includes: forming an active material compact containing a lithium double oxide and having a plurality of voids; forming a first solid electrolyte in the plurality of voids; impregnating a precursor solution of a second amorphous solid electrolyte conducting lithium ions with an active material compact in which the first solid electrolyte is formed; and performing heat treatment of the active material compact with which the precursor solution is impregnated and forming a second solid electrolyte in the plurality of voids.

Abstract: A solid electrolyte includes a plurality of particles having lithium ionic conductivity and a matrix which is interposed among the particles so as to be in contact with each of the particles and is formed from an amorphous material containing the following (a) and (b): (a) lithium atoms; and (b) an oxide of at least one element selected from the group consisting of boron, a Group 14 element in period 3 or lower, and a Group 15 element in period 3 or lower.

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: 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 amorphous.

Abstract: A method for producing an electrode assembly includes: obtaining a porous active material molded body by molding a constituent material containing a lithium multiple oxide in the form of particles by compression, and then performing a heat treatment at a temperature of 850° C. or higher and lower than the melting point of the used lithium multiple oxide; forming a solid electrolyte layer by applying a liquid containing a constituent material of an inorganic solid electrolyte to the surface of the active material molded body including the inside of each pore of the active material molded body, and then performing a heat treatment; and bonding a current collector to the active material molded body exposed from the solid electrolyte layer.

Abstract: An electrode complex includes: a complex which includes a porous active material molded body which is formed by being three-dimensionally connected with a plurality of particulate active material particles containing a lithium double oxide and a plurality of particulate noble metal particles containing a noble metal with a melting point of 1000° C. or higher and includes a communication hole, and a solid electrolyte layer formed on the surface of the active material molded body containing the communication hole of the active material molded body; and a current collector which is provided by being bonded to the active material molded body on one surface of the complex.