Abstract: An electrode includes an active material-containing layer. The active material-containing layer includes an active material containing a titanium-containing composite oxide, and carbon fiber. The active material-containing layer has a peak indicating a maximum logarithmic differential pore volume, in a logarithmic differential pore volume distribution curve by mercury porosimetry. A pore diameter PD at the peak is greater than 0.1 ?m and 0.3 ?m or less.

Abstract: According to one embodiment, an electrode group is provided. The electrode group includes a positive electrode, a negative electrode, and a gel polymer layer interposed between the positive electrode and the negative electrode. At least a part of the negative electrode is opposed to the positive electrode. The gel polymer layer is formed of a gel electrolyte composed of a polymer material, an organic solvent and a lithium salt, and a sheet base member which supports the gel electrolyte, or the gel polymer layer is formed of only the gel electrolyte.

Abstract: According to one embodiment, a secondary battery includes a positive electrode, a negative electrode, a separator layer, and a nonaqueous electrolytic solution. The separator layer includes a first porous layer containing a solid electrolyte and a second porous layer containing fibers. The second porous layer is in contact with a first surface of the first porous layer. The nonaqueous electrolytic solution includes a first solvent including at least one of methyl propionate and ethyl propionate, and a second solvent different from the first solvent. The first porous layer has a void fraction of 10% by volume or greater and 50% by volume or less. The second porous layer has a void fraction greater than the void fraction of the first porous layer.

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, an electrode structure is provided. The electrode structure includes: the current collector; the active material-containing layer provided on at least one surface of the current collector; and the organic fiber layer provided on the active material-containing layer. The organic fiber layer includes: the first region facing the active material-containing layer; and the second region adjacent to the first region, present on the center side of the main surface of the organic fiber layer, and facing the active material-containing layer. The density D1 of the first region of the organic fiber layer is higher than the density D2 of the second region of the organic fiber layer.

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, a method of producing a secondary battery is provided. The method includes preparing a battery architecture including a positive electrode, a negative electrode, and an electrolyte; adjusting a positive electrode potential to a range of 3.4 V to 3.9 V and a negative electrode potential to a range of 1.5 V to 2.0 V based on an oxidation-reduction potential of lithium, thereby providing a potential adjusted state; and holding the battery architecture in the potential adjusted state at a holding temperature of 50° C. to 90° C. The positive electrode includes a lithium-nickel-cobalt-manganese composite oxide. The negative electrode includes a niobium-titanium composite oxide. The electrolyte includes one or more first organic solvent having a viscosity of 1 cP or less.

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.

Abstract: According to one embodiment, an electrode is provided. The electrode includes a current collector, a first layer formed on the current collector, and a second layer formed on at least part of the first layer. The first layer contains a monoclinic niobium titanium composite oxide. The second layer contains lithium titanate having a spinel structure. A porosity P2 of the second layer is within a range from 30% to 80%.

Abstract: According to one embodiment, a secondary battery includes a positive electrode, a negative electrode, a separator layer, and a nonaqueous electrolytic solution. The separator layer includes a first porous layer containing a solid electrolyte and a second porous layer containing fibers. The second porous layer is in contact with a first surface of the first porous layer. The nonaqueous electrolytic solution includes a first solvent including at least one of methyl propionate and ethyl propionate, and a second solvent different from the first solvent. The first porous layer has a void fraction of 10% by volume or greater and 50% by volume or less. The second porous layer has a void fraction greater than the void fraction of the first porous layer.

Abstract: According to one embodiment, an electrode is provided. A length of a first active material portion along a first direction is within a range of 0.7T or more and 0.95T or less with respect to a thickness T of an active material-containing layer. The first direction is parallel to a thickness direction. A second active material portion further contains solid electrolyte particles. A ratio E1/E2 is 0 or more and 0.01 or less. The ratio E1/E2 represents a ratio of a content E1 of the solid electrolyte particles per unit area in the first active material portion (including 0) to a content E2 of the solid electrolyte particles per unit area in the second active material portion.

Abstract: According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer. The active material-containing layer includes: an active material including a titanium-containing composite oxide; inorganic solid particles having lithium ion conductivity; and carbon fiber. The active material-containing layer has a first peak indicating a maximum log differential pore volume in a log differential pore volume distribution curve according to mercury porosimetry. A pore diameter PD at the first peak is 0.01 ?m to 0.1 ?m. The first peak has a full width at half maximum of 0.05 ?m or less.

Abstract: According to one embodiment, provided is a solid electrolyte material including an oxide, the oxide including an octahedral coordination structure that includes a metal element M and oxygen atoms arranged centering on the metal element M. The metal element M includes Nb and Ta. Amass ratio ?Ta/?Nb of a mass ?Ta of Ta to a mass ?Nb of Nb is within a range of 5×10?5??Ta/?Nb?3×10?3.

Abstract: According to one embodiment, a storage battery includes one or more first batteries that include a first active material as a negative electrode active material, and one or more second batteries that include a second active material having an operation electric potential lower than that of the first active material as a negative electrode active material. Charge and the discharge of the second batteries are stopped based on a fact that a temperature of the storage battery is lower than a temperature threshold. The second batteries are caused to charge or discharge based on a fact that the temperature of the storage battery is equal to or higher than the temperature threshold.

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, an electrode group is provided. The electrode group includes a positive electrode, a negative electrode, and a gel polymer layer interposed between the positive electrode and the negative electrode. At least a part of the negative electrode is opposed to the positive electrode. The gel polymer layer is formed of a gel electrolyte composed of a polymer material, an organic solvent and a lithium salt, and a sheet base member which supports the gel electrolyte, or the gel polymer layer is formed of only the gel electrolyte.

Abstract: According to one embodiment, an electrode group includes a positive electrode active material-containing layer, a negative electrode active material-containing layer, a lithium ion conductive layer, and a porous layer. The lithium ion conductive layer includes lithium-containing inorganic particles. The lithium ion conductive layer covers at least part of the positive electrode active material-containing layer. The porous layer covers at least part of the negative electrode active material-containing layer. The positive electrode active material-containing layer and the negative electrode active material-containing layer face each other via the lithium ion conductive layer and the porous layer.

Abstract: According to one embodiment, an electrode structure is provided. The electrode structure includes an electrode and a separator. The electrode includes an active material-containing layer. The active material-containing layer contains active material particles. The separator includes a layer of organic fibers and inorganic solid particles. The layer of organic fibers is on the active material containing layer. The inorganic solid particles are on the layer of organic fibers. The inorganic solid particles are disposed so as to be biased to a surface side opposite to an electrode side of the separator.

Abstract: According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer. The active material-containing layer includes: an active material including a titanium-containing composite oxide; inorganic solid particles having lithium ion conductivity; and carbon fiber. The active material-containing layer has a first peak indicating a maximum log differential pore volume in a log differential pore volume distribution curve according to mercury porosimetry. A pore diameter PD at the first peak is 0.01 ?m to 0.1 ?m. The first peak has a full width at half maximum of 0.05 ?m or less.

Abstract: According to one embodiment, an electrode is provided. The electrode includes a current collector, a first layer formed on the current collector, and a second layer formed on at least part of the first layer. The first layer contains a monoclinic niobium titanium composite oxide. The second layer contains lithium titanate having a spinel structure. A porosity P2 of the second layer is within a range from 30% to 80%.