Abstract: A solid-state secondary battery is provided which can suppress chemical degradation from charging/discharging. A solid-state secondary battery includes a laminate body made by a positive electrode layer, solid electrolyte layer and negative electrode layer being laminated, and a first solid electrolyte having oxidation resistance and a second solid electrolyte having reduction resistance, in which content of a first solid electrolyte is greater than a second solid electrolyte in a solid electrolyte contained in the positive electrode layer, content of the first solid electrolyte is greater than the second solid electrolyte in a solid electrolyte contained in a region on a side of the positive electrode layer of the solid electrolyte layer, and content of the second solid electrolyte is greater than content of the first solid electrolyte in a solid electrolyte contained in a region on a side of the negative electrode layer of the solid electrolyte layer.

Abstract: A sulfide-based solid electrolyte is provided which is superior in oxidation resistance and reduction resistance. A sulfide-based solid electrolyte includes a chemical bond formed between Li2S—P2S5 and LiBH4, in which a mole ratio of the Li2S—P2S5 and the LiBH4 is 1:0.5.

Abstract: To provide an all-solid-state battery capable of extracting capacitance at lower pressure, despite a binder-less configuration free from an organic polymer compound binder and a method for manufacturing the same. An all-solid-state battery 10 includes a positive electrode layer 11 containing positive electrode active material particles and first solid electrolyte particles, a solid electrolyte layer 13 containing the first solid electrolyte particles, and a negative electrode layer 12 containing negative electrode active material particles and the first solid electrolyte particles, the positive electrode layer 11, the solid electrolyte layer 13, and the negative electrode layer 12 being bonded to one another, in which at least one layer of the positive electrode layer 11, the solid electrolyte layer 13, and the negative electrode layer 12 further contains a second solid electrolyte and the second solid electrolyte has crystallinity and is packed and arranged to fill gaps between the particles.

Abstract: Provided are a porosity deriving method and a porosity deriving device capable of deriving a porosity of an inspection object being conveyed. The porosity deriving method of deriving a porosity of the inspection object includes: a basis weight measuring step including measuring a basis weight of a specific part of the inspection object being conveyed; a thickness measuring step including measuring a thickness of the specific part of the inspection object being conveyed; and a porosity deriving step including deriving a porosity of the inspection object from the basis weight, the thickness, and a true density of the inspection object.

Abstract: A method for manufacturing a positive electrode material of a solid-state battery, the method includes a first mixing to mix a positive electrode active material with a conductive aid to generate a first powder, a second mixing to mix a solid electrolyte with the conductive aid to generate a second powder, and a third mixing to mix the first powder with the second powder to generate a third powder. According to the method, it is possible to reduce the amount of a dispersion medium when generating a slurry in manufacturing the positive electrode material.

Abstract: A method for manufacturing a positive electrode material of a solid-state battery, the method includes a first compositing to mix a positive electrode active material with a solid electrolyte to generate a first powder, and a second compositing to mix the solid electrolyte with the first powder under a stirring condition different from a stirring condition in the first compositing to generate a second powder. According to the method, it is possible to reduce the amount of a dispersion medium when generating a slurry in manufacturing the positive electrode material.

Abstract: An electrode material manufacturing method is a method for manufacturing an electrode material (50) of an all-solid-state battery, and the method includes: the step of preparing a coated active substance to prepare a coated active substance (10) containing a positive electrode active substance 11 and a coating layer (12) of an oxide-based solid-electrolyte that covers at least a portion of a surface thereof; the step of first compositing to manufacture a first composite material (20) by covering at least a portion of a surface of the solid electrolyte (21) with a conductive auxiliary agent (22); the step of second compositing to manufacture a second composite material (40) by covering a surface of the coated active substance (10) with the first composite material (20); and the step of mixing the second composite material (40), the conductive auxiliary agent (22), and the solid electrolyte (21) to manufacture an electrode material (50).

Abstract: Provided are a porosity deriving method and a porosity deriving device capable of deriving a porosity of an inspection object being conveyed. The porosity deriving method of deriving a porosity of the inspection object includes: a basis weight measuring step including measuring a basis weight of a specific part of the inspection object being conveyed; a thickness measuring step including measuring a thickness of the specific part of the inspection object being conveyed; and a porosity deriving step including deriving a porosity of the inspection object from the basis weight, the thickness, and a true density of the inspection object.

Abstract: To provide an all-solid-state battery capable of extracting capacitance at lower pressure, despite a binder-less configuration free from an organic polymer compound binder and a method for manufacturing the same. An all-solid-state battery 10 includes a positive electrode layer 11 containing positive electrode active material particles and first solid electrolyte particles, a solid electrolyte layer 13 containing the first solid electrolyte particles, and a negative electrode layer 12 containing negative electrode active material particles and the first solid electrolyte particles, the positive electrode layer 11, the solid electrolyte layer 13, and the negative electrode layer 12 being bonded to one another, in which at least one layer of the positive electrode layer 11, the solid electrolyte layer 13, and the negative electrode layer 12 further contains a second solid electrolyte and the second solid electrolyte has crystallinity and is packed and arranged to fill gaps between the particles.

Abstract: An electrode material manufacturing method is a method for manufacturing an electrode material (50) of an all-solid-state battery, and the method includes: the step of preparing a coated active substance to prepare a coated active substance (10) containing a positive electrode active substance 11 and a coating layer (12) of an oxide-based solid-electrolyte that covers at least a portion of a surface thereof; the step of first compositing to manufacture a first composite material (20) by covering at least a portion of a surface of the solid electrolyte (21) with a conductive auxiliary agent (22); the step of second compositing to manufacture a second composite material (40) by covering a surface of the coated active substance (10) with the first composite material (20); and the step of mixing the second composite material (40), the conductive auxiliary agent (22), and the solid electrolyte (21) to manufacture an electrode material (50).