Abstract: Provided is an electrode mixture used for an all-solid-state sodium storage battery that can maintain a high discharging capacity in a room temperature environment and exhibit excellent charge-discharge cycle characteristics. Further provided is a storage battery comprising the same. An object of the present invention is to provide an electrode mixture used for an all-solid-state sodium storage battery, the electrode mixture comprising an active material, wherein the active material is a cluster formed of polyphosphate acid transition metal oxide with a plurality of individual particles connected together, each particle having a particle size within the range of 0.1 ?m to 100 ?m.

Abstract: Provided are a sodium ion-conductive crystal-containing solid electrolyte sheet capable of giving excellent battery characteristics even when reduced in thickness, and an all-solid-state battery using the same. The solid electrolyte sheet contains at least one type of sodium ion-conductive crystal selected from ??-alumina and NASICON crystal and has a thickness of 500 ?m or less and a flatness of 200 ?m or less.

Abstract: Provided are a sodium ion-conductive crystal-containing solid electrolyte sheet capable of giving excellent battery characteristics even when reduced in thickness, and an all-solid-state battery using the same. The solid electrolyte sheet contains at least one type of sodium ion-conductive crystal selected from ??-alumina and NASICON crystal and has a thickness of 500 ?m or less and a flatness of 200 ?m or less.

Abstract: Provided are a sodium ion-conductive crystal-containing solid electrolyte sheet capable of giving excellent battery characteristics even when reduced in thickness, and an all-solid-state battery using the same. The solid electrolyte sheet contains at least one type of sodium ion-conductive crystal selected from ??-alumina and NASICON crystal and has a thickness of 500 ?m or less and a flatness of 200 ?m or less.

Abstract: Provided are a member for a sodium-ion secondary battery and a sodium-ion secondary battery both of which are not susceptible to deterioration of charge/discharge cycle characteristics due to charge and discharge. A member 8 for a sodium-ion secondary battery includes: a solid electrolyte layer 2 having sodium-ion conductivity; a metallic sodium layer 6 disposed on one principal surface 2b of the solid electrolyte layer 2 and made of metallic sodium; and a metallic layer 5 provided between the solid electrolyte layer 2 and the metallic sodium layer 6 and made of a metal different from the metallic sodium.

Abstract: Provided is a member for a power storage device that, even when the amount of electrode active material supported is increased, enables charge and discharge and thus achieves a high capacity. A member 6 for a power storage device includes: a solid electrolyte layer 1; and an electrode layer 2 provided on the solid electrolyte layer 1 and made of a sintered body of an electrode material layer 2A containing an electrode active material precursor powder having an average particle diameter of not less than 0.01 ?m and less than 0.7 ?m.

Abstract: The present invention provides a method for manufacturing a positive electrode material for an electricity storage device that can reduce excessive reactions between particles of a positive electrode active material precursor powder and between the positive electrode active material precursor powder and a solid electrolyte during thermal treatment to achieve excellent charge and discharge characteristics. A method for manufacturing a positive electrode material for an electricity storage device includes the step of subjecting a raw material containing a positive electrode active material precursor powder made of an amorphous oxide material to thermal treatment, wherein the positive electrode active material precursor powder has a crystallization temperature of 490° C. or lower.

Abstract: Provided is a solid electrolyte sheet capable of increasing the adhesiveness to the electrode layer and thus achieving an excellent discharge capacity. A solid electrolyte sheet 10 in which a second solid electrolyte layer 2 is formed on at least one of both surfaces of a first solid electrolyte layer 1, the second solid electrolyte layer 2 being a porous solid electrolyte layer.

Abstract: Provided is an all-solid-state sodium ion secondary battery in which a current collector is difficult to peel from an electrode layer and which can suppress the decreases in discharge capacity and discharge voltage.

Abstract: Provided is an all-solid-state sodium ion secondary battery in which a current collector is difficult to peel from an electrode layer and which can suppress the decreases in discharge capacity and discharge voltage.

Abstract: Provided are a sodium ion-conductive crystal-containing solid electrolyte sheet capable of giving excellent battery characteristics even when reduced in thickness, and an all-solid-state battery using the same. The solid electrolyte sheet contains at least one type of sodium ion-conductive crystal selected from ??-alumina and NASICON crystal and has a thickness of 500 ?m or less and a flatness of 200 ?m or less.

Abstract: Provided is a thin beta-alumina-based solid electrolyte sheet having a high ion conduction value. The solid electrolyte sheet containing ?-alumina and/or ??-alumina and having a thickness of 1 mm or less and a voidage of 20% or less.

Abstract: Provided is a thin beta-alumina-based solid electrolyte sheet having a high ion conduction value. The solid electrolyte sheet containing ?-alumina and/or ??-alumina and having a thickness of 1 mm or less and a voidage of 20% or less.

Abstract: Provided are a positive electrode active material for a sodium ion secondary battery excellent in quick charge-discharge characteristics by preventing fusion between particles of powder during firing, and a method of producing the same. A positive electrode active material for a sodium ion secondary battery of the present invention includes inorganic powder that contains at least one kind of transition metal element selected from the group consisting of Cr, Fe, Mn, Co, and Ni, Na, P, and O, and has a BET specific surface area of from 3 m2/g to 50 m2/g.

Abstract: Provided are a cathode active material for a sodium ion secondary battery that is excellent in alkali ion diffusivity, structural stability, and cycle performance, and a synthesis method therefor. The cathode active material for a sodium ion secondary battery includes a melt-solidified body or oxide glass represented by the general formula NaxMyP2O7 (where M represents at least one or more kinds of transition metal elements selected from Cr, Fe, Mn, Co, and Ni, x satisfies a relationship of 1.20?x?2.10, and y satisfies a relationship of 0.95?y?1.60).

Abstract: A composite material as an electrode for a sodium ion secondary battery includes an active material crystal, a sodium-ion conductive crystal, and an amorphous phase. The active material crystal may contain Na, M (where M represents at least one kind of transition metal element selected from Cr, Fe, Mn, Co, and Ni), P, and O.

Abstract: Provided is a thin beta-alumina-based solid electrolyte sheet having a high ion conduction value. The solid electrolyte sheet containing ?-alumina and/or ??-alumina and having a thickness of 1 mm or less and a voidage of 20% or less.

Abstract: Provided are a positive electrode active material for a sodium ion secondary battery excellent in quick charge-discharge characteristics by preventing fusion between particles of powder during firing, and a method of producing the same. A positive electrode active material for a sodium ion secondary battery of the present invention includes inorganic powder that contains at least one kind of transition metal element selected from the group consisting of Cr, Fe, Mn, Co, and Ni, Na, P, and O, and has a BET specific surface area of from 3 m2/g to 50 m2/g.

Abstract: A composite material as an electrode for a sodium ion secondary battery includes an active material crystal, a sodium-ion conductive crystal, and an amorphous phase. The active material crystal may contain Na, M (where M represents at least one kind of transition metal element selected from Cr, Fe, Mn, Co, and Ni), P, and O.

Abstract: Provided are a cathode active material for a sodium ion secondary battery that is excellent in alkali ion diffusivity, structural stability, and cycle performance, and a synthesis method therefor. The cathode active material for a sodium ion secondary battery includes a melt-solidified body or oxide glass represented by the general formula NaxMyP2O7 (where M represents at least one or more kinds of transition metal elements selected from Cr, Fe, Mn, Co, and Ni, x satisfies a relationship of 1.20?x?2.10, and y satisfies a relationship of 0.95?y?1.60).