Abstract: Provided is a method for producing a positive electrode active material for an alkali ion secondary battery, the positive electrode active material containing a large amount of a transition metal and enabling operation of the battery. In the method for producing a positive electrode active material for an alkali ion secondary battery, in which the positive electrode active material contains 34 mol % or more of CrO+FeO+MnO+CoO+NiO, the method includes: a step of preparing a positive electrode active material precursor containing crystals; and a step of irradiating the positive electrode active material precursor with light to melt the crystals and amorphize at least a portion of the positive electrode active material precursor.

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 is a sintered body electrode, a battery member, and sintered body electrode and battery member manufacturing methods all of which can increase the safety and operate a battery at low temperatures. A sintered body electrode 3 according to the present invention contains: a carbon electrode material made of graphite or hard carbon; and an alkali-ion conductive solid electrolyte.

Abstract: Provided is a bipolar all-solid-state sodium ion secondary battery that can increase the voltage without impairing safety. A bipolar all-solid-state sodium ion secondary battery includes: a plurality of all-solid-state sodium ion secondary batteries 1 in each of which a positive electrode layer 3 capable of absorbing and releasing sodium, a solid electrolyte layer 4 made of a sodium ion-conductive oxide, and a negative electrode layer 5 capable of absorbing and releasing sodium are laid one upon another in this order; and a current collector layer 2 provided between the positive electrode layer 3 of each of the plurality of all-solid-state sodium ion secondary batteries 1 and the negative electrode layer 5 of the adjacent all-solid-state sodium ion secondary battery 1 and shared by the positive electrode layer 3 and the negative electrode layer 5.

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 bipolar all-solid-state sodium ion secondary battery that can increase the voltage without impairing safety. A bipolar all-solid-state sodium ion secondary battery includes: a plurality of all-solid-state sodium ion secondary batteries 1 in each of which a positive electrode layer 3 capable of absorbing and releasing sodium, a solid electrolyte layer 4 made of a sodium ion-conductive oxide, and a negative electrode layer 5 capable of absorbing and releasing sodium are laid one upon another in this order; and a current collector layer 2 provided between the positive electrode layer 3 of each of the plurality of all-solid-state sodium ion secondary batteries 1 and the negative electrode layer 5 of the adjacent all-solid-state sodium ion secondary battery 1 and shared by the positive electrode layer 3 and the negative electrode layer 5.

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: Provided is a member for an electricity storage device and an electricity storage device in each of which alkali metal ions are used as carrier ions and which can improve charge/discharge characteristics. A member for an electricity storage device includes: a solid electrolyte layer 2 containing an alkali metal ion-conducting solid electrolyte; an alkali metal layer 3 laid on the solid electrolyte layer 2 and containing an alkali metal; and an electrode layer laid on the alkali metal layer 3 and containing a material capable of absorbing and releasing alkali metal ions.

Abstract: The present invention provides a novel positive electrode active material for a sodium-ion secondary battery having a high voltage and a high capacity. The positive electrode active material for a sodium-ion secondary battery contains, in terms of % by mole of oxide, 8 to 55% Na2O, 10 to 70% CoO, 0 to 60% CrO+FeO+MnO+NiO, and 15 to 70% P2O5+SiO2+B2O3 and also contains an amorphous phase.

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 Ni-based positive electrode active material for a sodium ion secondary battery having an excellent discharge capacity. A positive electrode active material for a sodium ion secondary battery, the positive electrode active material being composed of crystals represented by a general formula Nax (Ni1-aMa)yP2Oz (where M represents at least one transition metal element selected from the group consisting of Fe, Cr, Mn, and Co and the following are satisfied: 0.6?x?4, 0.3?y?2.7, 0?a?0.9, and 6?z<7.5).

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 a secondary cell electrode capable of achieving excellent charge and discharge capacities. A secondary cell electrode contains an electrode active material powder and an organic binder and emits fluorescence in Raman spectrometry with a wavelength of 532 nm.

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 a Ni-based positive electrode active material for a sodium ion secondary battery having an excellent discharge capacity. A positive electrode active material for a sodium ion secondary battery, the positive electrode active material being composed of crystals represented by a general formula Nax (Ni1?aMa) yP2Oz (where M represents at least one transition metal element selected from the group consisting of Fe, Cr, Mn, and Co and the following are satisfied: 0.6?x?4, 0.3?y?2.7, 0?a?0.9, and 6?z<7.5).

Abstract: Provided is a novel positive electrode active material for a sodium-ion secondary cell having a good discharge capacity. A positive electrode active material for a sodium-ion secondary cell, the positive electrode active material containing, in terms of % by mole of oxide, 8 to 55% Na2O, 10 to 70% NiO, 0 to 60% CrO+FeO+MnO+CoO, and 15 to 70% P2O5+SiO2+B2O3 and containing an amorphous phase.

Abstract: Provided is a negative electrode active material for a power storage device that has a low operating potential, can increase the operating voltage of the power storage device, and has excellent cycle characteristics. The negative electrode active material for a power storage device, the negative electrode active material containing as elements at least one selected from Si, B, and P; Nb; and O.