Abstract: A battery including a coiled electrode assembly with positive and negative electrodes coiled with a separator interposed therebetween, where the negative electrode includes a negative electrode current collector, a first negative electrode mixture layer formed on a first surface of the negative electrode current collector, the first surface facing an outside of the electrode assembly, and a second negative electrode mixture layer formed on a second surface of the negative electrode current collector, the second surface facing an inside of the electrode assembly. The first negative electrode mixture layer contains cellulose and rubber binders. A content of the cellulose binder is larger near a surface of the mixture layer than near the negative electrode current collector and a content of the rubber binder is larger near the negative electrode current collector than near the surface of the mixture layer in the thickness direction of the first negative electrode mixture layer.

Abstract: Provided is a non-aqueous electrolyte secondary, rile non-aqueous electrolyte secondary battery according to one mode of the present disclosure comprises an electrode body in Which a band-form positive electrode and a band-forth negative electrode are wound with a separator interposed therebetween, an electrolytic liquid, and an exterior body that accommodates the electrode body and the electrolytic liquid. The negative electrode has a negative electrode current collector, and a negative electrode mixture layer that is formed on the surface of the negative electrode current collector and that contains a negative electrode active material and an electroconductive agent.

Abstract: A non-aqueous electrolyte secondary battery according to an aspect of the present disclosure comprises: an electrode body in which a belt-shaped positive electrode and a belt-shaped negative electrode are wound with a separator therebetween; an electrolyte; and an outer case which accommodates the electrode body and the electrolyte. The negative electrode has a negative electrode current collector and a negative electrode mixture layer which is formed on a surface of the negative electrode current collector and which contains a negative electrode active material and a solid electrolyte. The negative electrode mixture layer has a region in which the solid electrolyte content in the inner winding end part is higher than the solid electrolyte content in the outer winding end part, and the solid electrolyte content continuously decreases from the inner winding end part side to the outer winding end part side.

Abstract: A non-aqueous electrolyte secondary battery is characterized by comprising an electrode body in which a positive electrode and a negative electrode face each other with a separator therebetween, and a battery case that accommodates the electrode body, wherein: the positive electrode has a positive electrode mixture layer containing a positive electrode active material; and when the non-aqueous electrolyte secondary battery is used in a fixed state, and the electrode body in the fixed state is bisected in the vertical direction, a dibutyl phthalate oil absorption amount of the positive electrode active material contained in the positive electrode mixture layer disposed in the top half region is higher than a dibutyl phthalate oil absorption amount of the positive electrode active material contained in the positive electrode mixture layer disposed in the bottom half region.

Abstract: A water-based binder for a non-aqueous electrolyte secondary battery. A binder for a non-aqueous electrolyte secondary battery electrode, includes a crosslinked polymer having a carboxyl group or a salt thereof, and the crosslinked polymer includes a structural unit derived from an ethylenically unsaturated carboxylic acid monomer; and a structural unit derived from a macromonomer including at least one compositional monomer selected from compounds represented by following formula (1): [C1] H2C?CR1—X??formula (1) wherein in formula (1), R1 represents a hydrogen or a methyl group; X represents C(?O)OR2 or CN; and R2 represents a straight chain or branched C1-C8 alkyl group or a C3-C8 alkyl group having an alicyclic structure.

Abstract: A positive electrode for a non-aqueous electrolyte secondary battery comprises a positive electrode mixture layer includes a positive electrode active substance. The quantity of dibutyl phthalate oil absorbed by the positive electrode active substance included in a lower-half region of the positive electrode mixture layer, when the positive electrode mixture layer is divided in the thickness direction into two equal parts, is less than the quantity of dibutyl phthalate oil absorbed by the positive electrode active substance included in an upper-half region; the quantity of dibutyl phthalate oil absorbed by the positive electrode active substance included in the lower-half region is at least 11 mL/100 g and no more than 19 mL/100 g; and the quantity of dibutyl phthalate oil absorbed by the positive electrode active substance included in the upper-half region is at least 15 mL/100 g and no more than 23 mL/100 g.

Abstract: An embodiment of the present invention provides a non-aqueous electrolyte secondary battery wherein a separator has a porous base material and a heat-resistant layer including a filler and a binding agent. The heat-resistant layer includes a first heat-resistant layer formed on a first surface of the base material facing a positive electrode and a second heat-resistant layer formed on a second surface of the base material facing a negative electrode. The first heat-resistant material is formed as a sheet on the first surface of the base material and the second heat-resistant layer is formed as dots on the second surface of the base material. The average value of the intervals between the plurality of dots constituting the second heat-resistant layer is 30-100 ?m.

Abstract: A non-aqueous electrolyte secondary battery including a wound electrode body in which a positive electrode and a negative electrode are wound with a separator therebetween; the positive electrode having a positive electrode current collector, a first positive electrode mixture layer formed on a first surface of the positive electrode current collector which faces the outside of the electrode body, and a second positive electrode mixture layer formed on a second surface of the positive electrode current collector which faces the inside of the electrode body; the first positive electrode mixture layer and the second positive electrode mixture layer each containing a positive electrode active material; and the dibutyl phthalate oil absorption amount of the positive electrode active material contained in the first positive electrode mixture layer being less than the dibutyl phthalate oil absorption amount of the positive electrode active material contained in the second positive electrode mixture layer.

Abstract: A binder for a non-aqueous electrolyte secondary battery electrode that includes a crosslinked polymer having a carboxyl group or a salt thereof, wherein the crosslinked polymer includes 50% by mass or more and 100% by mass or less structural unit derived from an ethylenically unsaturated carboxylic acid monomer relative to all structural units, wherein a total amount of the ethylenically unsaturated carboxylic acid monomer and a salt thereof in terms of a non-neutralized form which is converted from the ethylenically unsaturated carboxylic acid monomer and a salt thereof relative to a total amount of the crosslinked polymer and a salt thereof is 5.0% by mass or less.

Abstract: A separator for nonaqueous electrolyte secondary batteries according to one embodiment of the present disclosure comprises a porous base material and a heat-resistant porous film that is arranged on at least one surface of the porous base material so as to face an electrode of a nonaqueous electrolyte secondary battery. The heat-resistant porous film contains a filler and a binder; and at least a part of a facing part A of the heat-resistant porous film, said facing part A facing the edge portion of the electrode, has a higher binder content than a facing part B of the heat-resistant porous film, said facing part B facing the central portion of the electrode.

Abstract: A nonaqueous electrolyte secondary battery provided with a positive electrode, a negative electrode and a nonaqueous electrolyte. An electrode mixture layer of the positive electrode contains: first lithium metal composite oxide particles that are non-aggregated particles which have a volume-based median diameter of from 2 ?m to 10 ?m; and second lithium metal composite oxide particles that are secondary particles, in each of which primary particles having an average particle diameter of from 50 nm to 2 ?m aggregate, and which have a volume-based median diameter of from 10 ?m to 30 ?m. With a first region and the second region sequentially halved from the surface side of the positive electrode mixture layer, the content of the first lithium metal composite oxide particles in the first region is higher than the content of the first lithium metal composite oxide particles in the second region.

Abstract: A nonaqueous electrolyte secondary battery positive electrode according to an aspect of the present disclosure is provided with a positive electrode collector and a positive electrode mixture layer that is formed on the surface of the positive electrode collector. The positive electrode mixture layer contains a positive electrode active material, fibrous carbon, and nonfibrous carbon. When the positive electrode mixture layer is divided into two equal regions in the thickness direction, and the half of the regions that is on the positive electrode collector side is defined as a first region and the half of the regions that is on the outer surface side is defined as a second region, the mass proportion of the fibrous carbon with respect to the total mass of the fibrous carbon and the nonfibrous carbon in the first region is set to be less than that in the second region.

Abstract: The non-aqueous electrolyte secondary battery according to one embodiment of the present disclosure comprises a wound-type electrode body. A negative electrode has: a negative electrode current collector; a double-sided coated part in which a negative electrode mixture layer including a negative electrode active material and a binder is formed on the surface of the negative electrode current collector, and a negative electrode mixture layer is formed on both surfaces of the negative electrode current collector; and a one-sided coated part in which a negative electrode mixture layer is formed on one outer-periphery-side surface of the negative electrode current collector. At least a portion of the one-sided coated part is positioned on the outermost periphery of the electrode body. The swelling degree of the binder in the one-sided coated part is higher than the swelling degree of the binder in the double-sided coated part.

Abstract: A nonaqueous electrolyte secondary battery according to one embodiment of the present disclosure is provided with a wound-type electrode body. A negative electrode has: a negative electrode collector; and negative electrode mixture layers that are formed on both lateral surfaces of the negative electrode collector, while containing at least a negative electrode active material and a binder. The negative electrode mixture layers include an inner negative electrode mixture layer that is positioned on the inner circumference side of the negative electrode collector and an outer negative electrode mixture layer that is positioned on the outer circumference side. The swelling degree of the binder contained in the outer negative electrode mixture layer is higher than the swelling degree of the binder contained in the inner negative electrode mixture layer; and the outer negative electrode mixture layer contains a binder that has a swelling degree of from 150% to 250%.

Abstract: A negative electrode comprises a sheet-like negative current collector having a negative electrode mixture layer formed on a surface thereof, and includes a double-side coating, portion in which the negative electrode mixture layer is formed on both sides of the negative current collector, and a single-side coating portion in which the negative electrode mixture layer is formed on one side of the negative current collector. At least a part of the single-side coating portion is disposed at the outermost periphery of the electrode assembly. At least a part of an exposed surface of the negative current collector in the single-side coating portion is in contact with the inner surface of an outer can. The charge expansion ratio of the negative electrode mixture layer in the single-side coating portion is greater than the charge expansion ratio of the negative electrode mixture layer in the double-side coating portion.

Abstract: The non-aqueous electrolyte secondary battery according to an aspect of the present disclosure comprises: a wound electrode body on which a strip-like positive electrode and a strip-like negative electrode are each wound with a separator interposed therebetween; and an outer package accommodating the electrode body. The positive electrode comprises a positive current collector and a positive mixture layer that is formed on the positive current collector and contains at least a positive active material and a binder. The negative electrode comprises a negative current collector and a negative mixture layer that is formed on the negative current collector and contains at least a negative active material and a binder. At least one of the positive mixture layer and the negative mixture layer has a binder content that is higher on a leading end than on a terminal end.

Abstract: A nonaqueous electrolyte secondary battery including an electrode body which comprises a positive electrode, a negative electrode and a separator that is arranged between the positive electrode and the negative electrode, while comprising a heat-resistant layer and a base material layer; and a nonaqueous electrolyte. The positive electrode having a positive electrode mixture layer containing a positive electrode active material and resin-coated particles obtained by coating metal-based particles with a resin that melts at a temperature from 100° C. to 150° C.; the metal-based particles contain at least either metal or metal compound particles, which are dissolved in the nonaqueous electrolyte at 4.3 V (vs. Li/Li+) or less; the metal-based particles have an average particle diameter of more than 1 ?m; the content of the resin-coated particles is 0.5%-10% by mass relative to the total amount of the positive electrode mixture layer; and the heat-resistant layer contains a filler and a binder.

Abstract: A secondary cell that is one example of this embodiment comprises a winding-type electrode body in which a positive electrode and a negative electrode are wound with a separator interposed therebetween. The positive electrode has: a positive-electrode collector body; a first positive-electrode mixture layer formed on a first surface of the positive-electrode collector body facing the outer side of the electrode body; and a second positive-electrode mixture layer formed on a second surface of the positive-electrode collector body facing the inner side of the electrode body. The first positive-electrode mixture layer includes a first positive-electrode active material, and the second positive-electrode mixture layer includes a second positive-electrode active material, the average surface roughness of the first positive-electrode active material being greater than the average surface roughness of the second positive-electrode active material.

Abstract: The purpose of the present invention is to provide a winding-type nonaqueous electrolyte secondary battery which is capable of minimizing degradation of charge-discharge cycle characteristics.

Abstract: A battery including a coiled electrode assembly with positive and negative electrodes coiled with a separator interposed therebetween, where the negative electrode includes a negative electrode current collector, a first negative electrode mixture layer formed on a first surface of the negative electrode current collector, the first surface facing an outside of the electrode assembly, and a second negative electrode mixture layer formed on a second surface of the negative electrode current collector, the second surface facing an inside of the electrode assembly. The first negative electrode mixture layer contains cellulose and rubber binders. A content of the cellulose binder is larger near a surface of the mixture layer than near the negative electrode current collector and a content of the rubber binder is larger near the negative electrode current collector than near the surface of the mixture layer in the thickness direction of the first negative electrode mixture layer.