Abstract: In general, according to one embodiment, a charge control method includes acquiring a measured temperature of a lithium ion battery, acquiring a threshold value for stopping charging of the lithium ion battery according to the measured temperature of the lithium ion battery based on a relationship between a cycle life and a charging capacity of the lithium ion battery for each temperature of the lithium ion battery, and, charging the lithium ion battery based on the threshold value.

Abstract: According to one embodiment, there is provided a secondary battery including a negative electrode, a positive electrode, a first electrolyte, a second electrolyte, and a hydrogel electrolyte. The first electrolyte is in contact with at least a part of the negative electrode. The second electrolyte is in contact with at least a part of the positive electrode. The hydrogel electrolyte includes a gel having a chemically crosslinked structure. A first electrolyte composition of the first electrolyte is different from a second electrolyte composition of the second electrolyte. At least one of the first electrolyte and the second electrolyte includes an aqueous solvent, the aqueous solvent including water. At least a part of at least one of the negative electrode and the positive electrode overlaps at least a part of the hydrogel electrolyte.

Abstract: According to one embodiment, an active material is provided. The active material includes a primary particle including an Nb10Ti2O29 phase and at least one Nb-rich phase selected from an Nb14TiO37 phase and an Nb24TiO64 phase. In the primary particle, a ratio MNb/MTi of substance amount of niobium to titanium satisfies 5.0<MNb/MTi?24.0. A diffraction chart according to a wide angle X-ray diffraction method using a CuK? ray for the active material includes a peak A and a peak C attributed to the Nb10Ti2O29 phase and a peak B appearing within a range of 2? of 25.5±0.2° attributed to the Nb-rich phase. The active material satisfies a peak intensity ratio represented by 0<IB/IA<5.0. A half width of the peak C is in a range of 0.15° or more and 0.80° or less.

Abstract: According to one embodiment, provided is an electrode group including a positive electrode and a negative electrode that includes a titanium-containing oxide. The electrode group has a wound structure of a flat shape, in which a stack including the positive electrode and the negative electrode is wound such that a center of the wound structure lies along a first direction. At least a part of a portion of the negative electrode, positioned within a thickness of 0.2 t from an innermost lap along a longest straight line in a wound cross-section of the wound structure orthogonal to the first direction with respect to a thickness t from the innermost lap to an outermost lap along the longest straight line, includes a slit that lies along the first direction.

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 one embodiment, a secondary battery includes a positive electrode including first vacancies, a negative electrode including second vacancies, and an electrolyte. The electrolyte includes a gel polymer portion and a liquid portion, and the gel polymer portion has a gel-part ratio within a range of from 20% to 80%. At least a part of the electrolyte is held in the first vacancies and the second vacancies. A first ratio r1 of the liquid portion to the gel polymer portion in the first vacancies is within a range of 0.01?r1?10. A second ratio r2 of the liquid portion to the gel polymer portion in the second vacancies is within a range of 0.01?r2?10.

Abstract: According to one embodiment, a secondary battery includes positive electrodes, negative electrodes, a separator, a positive electrode lead, a negative electrode lead, and an aqueous electrolyte. The positive electrodes each include a positive electrode current collector and a positive electrode tab. The positive electrode current collector includes a first polymeric material. The negative electrodes each include a negative electrode current collector and a negative electrode tab. The negative electrode current collector includes a second polymeric material. At least a portion of the positive electrode tab is in direct contact with the positive electrode lead. At least a portion of the negative electrode tab is in direct contact with the negative electrode lead.

Abstract: According to one embodiment, a secondary battery is provided. The secondary battery includes a first electrode having a first current collector, second electrode having a second current collector, and an aqueous electrolyte. The first electrode includes a first lead, and a first joint for electrically connecting the first current collector and the first lead. At least a part of the surface of the first current collector has a first current collector coating. At least a part of the surface of the first lead has a first lead coating. The thickness of the first lead coating is larger than the thickness of the first current collector coating.

Abstract: According to one embodiment, provided is an active material including a crystal particle that includes a niobium-titanium composite oxide. A ratio ANb/ATi of a Nb abundance ANb to a Ti abundance ATi in the crystal particle satisfies 2.3?ANb/ATi?4.0. According to a powder X-ray diffraction spectrum using a Cu-K? ray for the crystal particle, an intensity ratio I?/I? of a peak intensity I? of a peak ? appearing at 12.5°?2??13.0° to a peak intensity I? of a peak ? appearing at 8.5°?2??9.0° is within a range of 0.1<I?/I??2.0.

Abstract: According to one embodiment, a separator is provided. The separator includes a composite membrane. The composite membrane includes a substrate layer, a first composite layer, and a second composite layer. The first composite layer is located on one surface of the substrate layer. The second composite layer is located on the other surface of the substrate layer. The composite membrane has a coefficient of air permeability of 1×10?14 m2 or less. The first composite layer has a first surface and a second surface. The first surface is in contact with the substrate layer. The second surface is located on an opposite side to the first surface. Denseness of a portion including the first surface is lower than denseness of a portion including the second surface in the first composite layer.

Abstract: According to one embodiment, an electrode includes a current collector and an active material layer. The active material layer is disposed on at least one of faces of the current collector. The active material layer comprises active materials which include at least a cobalt-containing oxide and a lithium nickel manganese oxide. A ratio of a weight of the cobalt-containing oxide to a total of weights of the cobalt-containing oxide and the lithium nickel manganese oxide is 5 wt % or more and 40 wt % or less.

Abstract: A nonaqueous electrolyte battery includes: a positive electrode containing a positive electrode active material made of a compound represented by a compositional formula of LiMn1-x-yFexAyPO4 (wherein A is at least one selected from the group consisting of Mg, Ca, Al, Ti, Zn and Zr, 0?x?0.3, and 0?y?0.1); a negative electrode containing a negative electrode active material made from a titanium composite oxide; and a nonaqueous electrolyte, wherein a ratio (IP—F/IP—O) of a peak intensity (IP—F) of a P—F bond to a peak intensity (IP—O) of a P—O bond on the surface of the positive electrode, which are measured by X-ray photoelectron spectroscopic analysis, is 0.4 or more and 0.8 or less.

Abstract: According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer. The active material-containing layer contains an active material and a flat plate-shaped silicate.

Abstract: According to one embodiment, provided is a secondary battery including a positive electrode, a negative electrode, and an electrolyte. The negative electrode includes a niobium-titanium composite oxide having fluorine atoms on at least part of a surface the niobium-titanium composite oxide. An abundance ratio AF of fluorine atoms, an abundance ratio ATi of titanium atoms, and an abundance ratio ANb of niobium atoms on a surface of the negative electrode according to X-ray photoelectron spectroscopy satisfy a relationship of 3.5?AF/(ATi+ANb)?50.

Abstract: An electrode comprises a current collector; and an active material-containing layer having active materials on the current collector. The active material-containing layer has a first surface contacting the current collector and a second surface which is opposite side of the first surface. At least one part of the second surface is covered by a compound containing Zn. When an image of the second surface is taken by Scanning Electron Microscope, the image is divided into 100 blocks, a ratio of existence of blocks having hexagonal platelet shaped compound containing Zn to the 100 blocks is calculated, and the ratio of existence of blocks is calculated with respect to 10 images, an average of the ratio of existence of blocks with respect to the 10 images is 20% or less (including 0).

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 one embodiment, a slurry composition includes an active material, a conductive agent, a resin material, and a solvent comprising water. The active material includes niobium titanium-containing composite oxide particles. In a volume-based cumulative frequency distribution of particle sizes based on a particle size distribution of the slurry composition according to a laser diffraction-scattering method, a peak is positioned within a range of 0.8 ?m to 3 ?m, and a percentage of cumulative frequency up to a particle size of 1 ?m from a smaller particle size is in a range of 20% to 35%.

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 electrode is provided. The electrode includes a current collector, an electrode mixture layer, and a self-assembled film. The first self-assembled film covers at least a part of a surface of the current collector. The first self-assembled film contains organic molecules. The electrode mixture layer disposed on at least a part of the first self-assembled film.

Abstract: According to one embodiment, an electrode is provided. The active material-containing layer includes an active material, inorganic solid particles having lithium ion conductivity, and carbon fiber. A pore diameter DM at the first peak is 0.05 ?m to 10 ?m. A value SA?SB is 1.4 or more in a slope distribution curve of the active material-containing layer, where a vertical axis of the slope distribution curve represents a slope of a straight line passing through two adjacent measurement points on the log differential pore volume distribution curve and a horizontal axis of the slope distribution curve represents a smaller pore diameter of the two adjacent measurement points. The value SA?SB is obtained by subtracting a minimum slope value SB from a maximum slope value SA.