Abstract: According to one embodiment, provided is an active material including a niobium titanium-containing oxide phase and a carbon coating layer. The niobium titanium-containing oxide phase contains a niobium titanium-containing oxide having a monoclinic structure and Na, and a Na content therein is 0 ppm or more and 100 ppm or less. The carbon coating layer coats at least a part of the niobium titanium-containing oxide phase, and contains 0.001% or more of carboxyl group.

Abstract: In general, according to one embodiment, a recycling method is provided. The method includes dispersing an electrode containing a niobium titanium oxide in water; separating the niobium titanium oxide from the electrode dispersed in the water; and applying a first heat treatment to the separated niobium titanium oxide.

Abstract: According to one embodiment, a secondary battery including a negative electrode. The negative electrode includes a negative electrode current collector and a negative electrode mixture layer. A thickness of the negative electrode current collector is in a range of 8 ?m to 18 ?m. The negative electrode current collector includes a first current collector end surface extending along a stacking direction. The negative electrode mixture layer includes a niobium-titanium composite oxide, and a first protrusion protruding from the first current collector end surface along a first direction orthogonal to the stacking direction. A protrusion length A1 of the first protrusion satisfies 0 mm<A1?1.0 mm.

Abstract: According to a management method in an embodiment, in charging of a battery in each of a constant current mode and a constant power mode, it is determined that the battery is unusable based on a voltage of the battery dropping by a voltage threshold value or more from a starting time of dropping without increasing again to a voltage value at the starting time of dropping. In the management method, in charging of the battery in a constant voltage mode, it is determined that the battery is unusable based on a current supplied to the battery increasing by a current threshold value or more from a starting time of increasing without dropping again to a current value at the starting time of increasing.

Abstract: According to one embodiment, a method of producing a secondary battery includes preparing a battery architecture, which includes a positive electrode, a negative electrode, and an electrolyte, providing a potential adjusted state by adjusting a positive electrode potential to 4.3 V to 4.8 V and a negative electrode potential to 0.5 V to 1.1 V based on oxidation-reduction potential of lithium, and holding the battery architecture in the potential adjusted state. The positive electrode includes a nickel-containing oxide represented by a general formula LixM1O2. M1 is a metal element including at least Ni in an elemental ratio of 50% or more, and 0<x?1. The negative electrode includes a titanium-containing oxide. The electrolyte includes a sulfur-containing compound.

Abstract: According to a management method in an embodiment, in charging of a battery in each of a constant current mode and a constant power mode, it is determined that the battery is unusable based on a voltage of the battery dropping by a voltage threshold value or more from a starting time of dropping without increasing again to a voltage value at the starting time of dropping. In the management method, in charging of the battery in a constant voltage mode, it is determined that the battery is unusable based on a current supplied to the battery increasing by a current threshold value or more from a starting time of increasing without dropping again to a current value at the starting time of increasing.

Abstract: According to one embodiment, information related to a positive-electrode electric potential and a negative-electrode electric potential of each of one or more batteries is acquired, and whether deviation of the positive/negative-electrode electric potentials from a reference state is beyond a prescribed range is determined for each of one or more batteries. Further, in response to at least existence of a battery-to-be-restored that is a battery in which the determined deviation of positive/negative-electrode electric potentials from a reference state is beyond a prescribed range, a state of charge of the battery-to-be-restored is held in a restoration holding range for a prescribed time.

Abstract: According to one embodiment, a negative electrode is provided. The negative electrode includes a negative electrode active material-containing layer including a niobium titanium composite oxide and a sulfur-containing coating. Spectral data obtained by X-ray photoelectron spectroscopy on the surface of the negative electrode active material-containing layer includes a first peak with a peak top existing in the range of 208 eV to 210 eV and a second peak with a peak top existing in the range of 160 eV to 165 eV. The ratio (P2/P1) of the peak height P2 of the second peak to the peak height P1 of the first peak falls within the range of 0.05 to 2.

Abstract: According to one embodiment, an active material is provided. The active material includes particles of a monoclinic niobium titanium composite oxide. The particles include primary particles. The primary particles have an average aspect ratio of 5 or more.

Abstract: According to one embodiment, a secondary battery is provided. The secondary battery includes a negative electrode. The negative electrode includes an active material composite. The active material composite includes active material particles and a layer covering at least a portion of surfaces of the active material particles. The active material particles include titanium-containing oxide particles. The layer contains N and Si. The layer includes a first surface facing the at least the portion of surfaces of the active material particles and a second surface defining a layer thickness from the first surface. An N concentration in the layer decreases from the first surface to the second surface. A Si concentration in the layer increases from the first surface to the second surface.

Abstract: According to one embodiment, information related to a positive-electrode electric potential and a negative-electrode electric potential of each of one or more batteries is acquired, and whether deviation of the positive/negative-electrode electric potentials from a reference state is beyond a prescribed range is determined for each of one or more batteries. Further, in response to at least existence of a battery-to-be-restored that is a battery in which the determined deviation of positive/negative-electrode electric potentials from a reference state is beyond a prescribed range, a state of charge of the battery-to-be-restored is held in a restoration holding range for a prescribed time.

Abstract: According to one embodiment, an active material is provided. The active material includes particles of a monoclinic niobium titanium composite oxide. The particles include primary particles. The primary particles have an average aspect ratio of 5 or more.

Abstract: According to one embodiment, a secondary battery is provided. The secondary battery includes a negative electrode. The negative electrode includes an active material composite. The active material composite includes active material particles and a layer covering at least a portion of surfaces of the active material particles. The active material particles include titanium-containing oxide particles. The layer contains N and Si. The layer includes a first surface facing the at least the portion of surfaces of the active material particles and a second surface defining a layer thickness from the first surface. An N concentration in the layer decreases from the first surface to the second surface. A Si concentration in the layer increases from the first surface to the second surface.

Abstract: According to one embodiment, a copper recovery apparatus includes a precipitation tank, a mixing tank, a filter-aid feeder, a solid-liquid separator includes a filter, a cleaning-water supply line, a cleaning-water discharge line, a separation tank, and a filter-aid return line. The precipitation tank is configured to receive copper ions-containing water to be treated and an alkali to prepare treated water containing a precipitate of copper compound. The solid-liquid separator is configured to allow the treated water to be passed through the filter on which the precoat layer is deposited to separate the precipitate retained on the precoat layer from a filtrate.

Abstract: A chelating agent of the embodiment is an amide compound in which a hydrogen atom of an —NH— site or an —NH2— site in an amine compound is substituted with a functional group derived from diglycolic acid. The amine compound is selected from the group consisting of a compound represented by a following general formula (1) and a polyethyleneimine having a molecular weight of 200 to 100,000. In the general formula (1), x, y and z respectively represent a number of repetitions for —CH2—CH2—NH—, x represents an integer of 1 to 10, y represents an integer of 0 to 5, and z represents an integer of 0 to 5.

Abstract: According to one embodiment, a copper recovery apparatus includes a precipitation tank configured to precipitate copper hydroxide grains in water, a filter aid supplier, a mixing tank configured to mix the filter aid with a water to produce a suspension, a separator provided with a filter, a line configured to supply the suspension to the separator, thereby forming a precoat layer formed of the filter aid on the filter, a separation tank configured to receive the detached matter of the precoat layer discharged together with the detaching water from the separator to magnetically separate copper hydroxide grains and filter aid, a line configure to discharge and recover the detaching water from the separation tank, and a line configured to return the separated filter aid to the filter aid supplier from the separation tank.

Abstract: According to one embodiment, a copper recovery apparatus includes a precipitation tank, a mixing tank, a filter-aid feeder, a solid-liquid separator includes a filter, a cleaning-water supply line, a cleaning-water discharge line, a separation tank, and a filter-aid return line. The precipitation tank is configured to receive copper ions-containing water to be treated and an alkali to prepare treated water containing a precipitate of copper compound. The solid-liquid separator is configured to allow the treated water to be passed through the filter on which the precoat layer is deposited to separate the precipitate retained on the precoat layer from a filtrate.

Abstract: According to one embodiment, a copper recovery apparatus includes a precipitation tank configured to precipitate copper hydroxide grains in water, a filter aid supplier, a mixing tank configured to mix the filter aid with a water to produce a suspension, a separator provided with a filter, a line configured to supply the suspension to the separator, thereby forming a precoat layer formed of the filter aid on the filter, a separation tank configured to receive the detached matter of the precoat layer discharged together with the detaching water from the separator to magnetically separate copper hydroxide grains and filter aid, a line configure to discharge and recover the detaching water from the separation tank, and a line configured to return the separated filter aid to the filter aid supplier from the separation tank.

Abstract: According to one embodiment, a fluorine recovering apparatus includes a precipitating device allowing fluoride ion-containing water to react with calcium source to form precipitate, a mixing tank mixing a filter aid including particles of a magnetic material having a diameter of 0.5 to 5 ?m with a dispersion medium to produce slurry, a filter aid feeder to the mixing tank, a solid-liquid separator with a filter depositing a filter aid layer, and depositing the precipitate on the filter aid layer, a cleaning mechanism removing the filter aid and the precipitate, a separating tank separating the filter aid and the precipitate, and a returning mechanism returning the filter aid to the filter aid feeder.

Abstract: According to one embodiment, a copper recovery apparatus includes a precipitation tank, a mixing tank, a filter-aid feeder, a solid-liquid separator includes a filter, a cleaning-water supply line, a cleaning-water discharge line, a separation tank, and a filter-aid return line. The precipitation tank is configured to receive copper ions-containing water to be treated and an alkali to prepare treated water containing a precipitate of copper compound. The solid-liquid separator is configured to allow the treated water to be passed through the filter on which the precoat layer is deposited to separate the precipitate retained on the precoat layer from a filtrate.