Abstract: In general, according to one embodiment, a secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The nonaqueous electrolyte includes a nonaqueous solvent and an electrolyte. The nonaqueous solvent includes a first solvent including at least one selected from the group consisting of ethyl propionate, propyl propionate and ethyl butyrate, and a second solvent including ?-butyrolactone. The electrolyte includes lithium bisfluorosulfonylimide.

Abstract: A secondary battery diagnosis method rapidly charges a secondary battery at a low temperature and stores the secondary battery in a range of 45° C. or higher and 70° C. or lower for a predetermined period. The method determines a degree of voltage drop of the secondary battery between before and after storing the secondary battery. The secondary battery includes a negative electrode in which an active material having an average operating potential of 1.0 VvsLi/Li+ or more occupies 50% by weight or more of a negative electrode active material-containing layer.

Abstract: According to one embodiment, an active material including a niobium-titanium oxide phase having a monoclinic structure is provided. The niobium-titanium oxide phase has a crystal structure that includes in a crystal lattice thereof, at least one per unit lattice of a (Nb, Ti) O6 octahedron site composed only with vertex-sharing, a bond angle distortion in the octahedron site being 0.8 ?2/deg2 or less. A crystallite diameter of the niobium-titanium oxide phase is in a range from 85 nm or greater to 130 nm or less.

Abstract: According to one embodiment, an active material is provided. The active material includes an Nb2TiO7 phase and at least one Nb-rich phase selected from the group consisting of an Nb10Ti2O29 phase, an Nb14TiO37 phase, and an Nb24TiO64 phase. The active material includes potassium and phosphorus, and a total concentration of potassium and phosphorus in the active material is in the range of 0.01% by mass to 5.00% by mass. An average crystallite diameter is in the range of 80 nm to 150 nm. In a particle size distribution chart obtained by a laser diffraction scattering method, D10 is 0.3 ?m or greater, and D90 is 10 ?m or less. The active material satisfies a peak intensity ratio represented by the following Formula (1). 0<IB/IA?0.

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 nonaqueous electrolyte battery is provided. The nonaqueous electrolyte battery includes an electrode group, including a positive electrode, a negative electrode, and a separator. The separator includes at least one metal-element containing portion containing a metal element. The at least one metal-element containing portion is provided on a surface of the separator in contact with the negative electrode. The at least one metal-element containing portion contains at least one selected from a group consisting of a metal, a metallic oxide, and a metallic fluoride. An area of the at least one metal-element containing portion is in a range of 0.3 mm2 to 3.2 mm2.

Abstract: In general, according to one embodiment, a niobium-titanium oxide is provided. The niobium-titanium oxide satisfies Formulae (1) to (3) below in an L*a*b* color space according to Japanese Industrial Standard JIS Z 8722:2009: 95.0?L*?100??(1) ?1.0?a*?1.0??(2) ?1.0?b*?6.0??(3).

Abstract: A niobium-titanium-based oxide includes niobium-titanium-based oxide particles, wherein an Si2p peak area and an Nb3d peak area, as measured by X-ray photoelectron spectroscopy for the niobium-titanium-based oxide particles, satisfy a ratio A of 0.40?A?1.0, provided that the ratio A is the Si2p peak area/the Nb3d peak area.

Abstract: According to one embodiment, an electrode is provided. The electrode includes a current collector, and an active material-containing layer which is formed on a surface of the current collector and includes a plurality of niobium titanium composite oxide particles. A X-ray diffraction pattern using a Cu-K? ray source with respect to a surface of the active material-containing layer includes a peak A with a highest intensity in a range of 2?=26°±0.2° and a peak B with a highest intensity in a range of 2?=23.9°±0.2°. An intensity ratio (Ia/Ib) between an intensity Ia of the peak A and an intensity Ib of the peak B is in a range of 1.80 or more to 2.60 or less.

Abstract: According to one embodiment, provided is an air battery including a negative electrode, an air electrode to which oxygen is supplied, a solid electrolyte layer positioned between the negative electrode and the air electrode, an aqueous electrolyte layer positioned between the solid electrolyte layer and the air electrode, and a proton conduction layer positioned between the aqueous electrolyte layer and the air electrode. The aqueous electrolyte layer includes an aqueous electrolyte including a polyprotic acid having two or more carboxyl groups, an electrolyte salt, and water.

Abstract: In general, according to one embodiment, an active material including particles containing a niobium-containing oxide is provided. The particles containing the niobium-containing oxide contain single particles having protruded parts and recessed parts. Three or more of the recessed parts satisfy 0.1?a/L?0.5 (1). Where L is a length of a tangent line in contact with a first protruded part and a second protruded part, and a is a maximum length of a perpendicular line from the tangent line to a recessed part defined by the first protruded part and the second protruded part.

Abstract: According to one embodiment, an electrode is provided. The electrode includes a current collector and an active material-containing layer formed on the current collector and containing active material particles. A median diameter (D50) calculated from a volume-based frequency distribution chart obtained by a laser diffraction/scattering method for the active material particles is in the range of 1.2 ?m to 4.0 ?m. In the frequency distribution chart, a proportion of an integrated amount of particles having a particle size of 2.0 ?m or less is in the range of 36% to 62% with respect to the entire active material particles on a volume basis.

Abstract: According to one embodiment, an active material is provided. The active material includes an Nb2TiO7 phase and at least one Nb-rich phase selected from the group consisting of an Nb10Ti2O29 phase, an Nb14TiO37 phase, and an Nb24TiO64 phase. The active material includes potassium and phosphorus, and a total concentration of potassium and phosphorus in the active material is in the range of 0.01% by mass to 5.00% by mass. An average crystallite diameter is in the range of 80 nm to 150 nm. In a particle size distribution chart obtained by a laser diffraction scattering method, D10 is 0.3 ?m or greater, and D90 is 10 ?m or less. The active material satisfies a peak intensity ratio represented by the following Formula (1). 0<IB/IA0.

Abstract: According to one embodiment, an electrode is provided. The electrode includes a current collector, and an active material-containing layer which is formed on a surface of the current collector and includes a plurality of niobium titanium composite oxide particles. A X-ray diffraction pattern using a Cu-K? ray source with respect to a surface of the active material-containing layer includes a peak A with a highest intensity in a range of 2?=26°±0.2° and a peak B with a highest intensity in a range of 2?=23.9°±0.2°. An intensity ratio (Ia/Ib) between an intensity Ia of the peak A and an intensity Ib of the peak B is in a range of 1.80 or more to 2.60 or less.