Abstract: A negative electrode includes a negative electrode protecting layer that is disposed so as to cover a negative electrode active material layer formed on at least one surface of a negative electrode core in a thickness direction and that has higher electrical resistance than the negative electrode active material layer. The negative electrode active material layer includes a first surface and a second surface. The first surface is formed in a region extending from an edge at one end to a boundary 300 ?m away from the edge in a width direction. The second surface is positioned closer than the first surface to the other end. Regarding the negative electrode protecting layer, the average value of the first thickness of a first portion covering the first surface is 1.7 or more times larger than the maximum value of the second thickness of a second portion covering the second surface.

Abstract: The positive electrode disclosed herein includes a positive electrode current collector foil, positive electrode active material layers disposed on both surfaces of the current collector foil, a first protection layer disposed adjacent to the positive electrode active material layer on one surface of the current collector foil. The current collector foil has an exposed portion in which the current collector foil is exposed, at least at one end. The first protection layer is located between the exposed portion and the positive electrode active material layer. The first protection layer has an inclined portion in which a thickness of the first protection layer decreases from the positive electrode active material layer side toward the exposed portion. The inclined portion is configured so that an angle to the surface of the current collector foil is constant or decreases toward the exposed portion.

Abstract: This electrode plate for a secondary battery comprises a thin plate-shaped core formed from a metal foil and an active material layer formed on at least one surface of the core. A melted section of the metal foil forming the core is scattered at an end section of the electrode plate for a secondary battery so as to spread from the plate thickness range of the core to the end face of the active material layer, adheres thereto, and is solidified.

Abstract: A manufacturing method of a positive electrode plate for a non-aqueous electrolyte secondary battery includes a coating and drying step of coating a positive electrode active material layer and a protective layer onto a positive electrode core so that the protective layer forms a raised part between a portion inside a side end of a core exposed part in a width direction and a width-direction center, and then drying the positive electrode active material layer and the protective layer; and a compressing step of compressing the protective layer and the positive electrode active material layer so as to press the raised part formed in the coating and drying step and the positive electrode active material layer.

Abstract: This electrode plate for a non-aqueous electrolyte secondary battery has: an electrode core having an undercoat layer formed on the surface thereof; an electrode mixture layer formed on the undercoat layer of the electrode core. The undercoat layer is obtained by applying an undercoat dispersion on the surface of the electrode core and drying the same. A conductive auxiliary agent used for the undercoat layer is formed of carbon nanotubes. The average diameter of the conductive auxiliary agent is 12 nm or less. The aspect ratio (average length/average diameter) of the conductive auxiliary agent is 4000 or greater. The thickness of the undercoat layer is 0.10 ?m or less.

Abstract: This electrode plate for a non-aqueous electrolyte secondary battery comprises: an electrode core with an undercoat layer formed on the surface thereof; and an electrode composite layer formed on the undercoat layer of the electrode core. The undercoat layer can be obtained by applying an undercoat dispersion liquid on the surface of the electrode core and drying the dispersion liquid. The average diameter of an electroconductive auxiliary agent used for the undercoat layer is no greater than 12 nm. The molecular weight of a binder used for the undercoat layer is no less than 900,000. The thickness of the undercoat layer is no greater than 20 ?m. The molecular weight of a binder used for the electrode composite layer is no less than 900,000.

Abstract: A positive electrode includes a positive electrode substrate and a positive electrode active material layer disposed on at least one surface of the positive electrode substrate. The positive electrode active material layer contains a positive electrode active material, a binder, and an electroconductive agent. The positive electrode active material layer contains, as the electroconductive agent, a string-shaped agglomerate formed of fibrous carbons gathered and entangled with each other. The agglomerate has a length of 30 ?m or more.

Abstract: A negative electrode plate for a non-aqueous electrolyte secondary battery includes a negative electrode substrate and a negative electrode active material layer. The negative electrode active material layer is placed on a surface of the negative electrode substrate. The negative electrode active material layer includes negative electrode active material particles and carboxymethylcellulose. The negative electrode active material particles include graphite. Volume-based particle size distribution of the negative electrode active material particles satisfies relationships of expression (I) “16 ?m?D50?20 ?m” and expression (II) “(D90?D10)/D50?1”. The carboxymethylcellulose has a weight average molecular weight from 350,000 to 370,000. The carboxymethylcellulose has a degree of etherification from 0.65 to 0.82.

Abstract: A nonaqueous electrolyte secondary battery includes a first electrode plate including a core plate and an active material layer including an active material and a binder, and disposed on a surface of the core plate; a second electrode plate; and a nonaqueous electrolyte. When the surface of the active material layer in contact with the core plate is taken as zero point, the amount of the binder in a 0%-10% thickness region X is 8.5 to 9.5 mass % of the total amount of the binder in the active material layer, the amount of the binder in a 90%-100% thickness region Y is 9.5 to 11.5 mass % of the total amount of the binder in the active material layer, and a binder-richest portion across the thickness of the active material layer resides in a 55%-100% thickness region across the thickness of the active material layer.

Abstract: A negative electrode active material slurry is applied to one surface of a strip-shaped negative electrode core so as to form multiple lines of the negative electrode active material slurry, the lines extending in an X direction and being spaced from each other in a Y direction. Subsequently, while keeping the negative electrode core aloft, first hot air is blown toward the negative electrode core from at least a lower side in a vertical direction, and then, while keeping the negative electrode core aloft, first cooling air having a lower temperature than the first hot air is blown toward the negative electrode core from at least the lower side in the vertical direction so as to decrease the temperature of the negative electrode core to 40° C. or lower.

Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes a negative electrode including a negative electrode core and negative electrode mixture layers formed on both surfaces of the negative electrode core. Each of the negative electrode mixture layers contains a cellulose-based binder composed of at least one of carboxymethyl cellulose and a salt thereof. When each of the negative electrode mixture layers is divided in half, at the center in the thickness direction, into a first region near the negative electrode core and a second region far from the negative electrode core, the content of the cellulose-based binder present in the first region is 35% by mass or more and less than 50% by mass of the total mass of the cellulose-based binder contained in the entire of each of the negative electrode mixture layers.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode plate having a positive electrode active material layer formed on a positive electrode core, a negative electrode plate having a negative electrode active material layer formed on a negative electrode core, and a flat-shape wound electrode body in which the positive electrode plate and the negative electrode plate are wound through a separator. Further, a protective layer is formed on the positive electrode active material layer or the negative electrode active material layer. The protective layer contains ceramic particles and a binder, and the average particle diameter (D50) and the average particle diameter (D90) of the ceramic particles are 1.0 ?m to 1.8 ?m and 3.0 ?m to 5.0 ?m, respectively.

Abstract: A negative electrode includes a negative electrode protecting layer that is disposed so as to cover a negative electrode active material layer formed on at least one surface of a negative electrode core in a thickness direction and that has higher electrical resistance than the negative electrode active material layer. The negative electrode active material layer includes a first surface and a second surface. The first surface is formed in a region extending from an edge at one end to a boundary 300 ?m away from the edge in a width direction. The second surface is positioned closer than the first surface to the other end. Regarding the negative electrode protecting layer, the average value of the first thickness of a first portion covering the first surface is 1.7 or more times larger than the maximum value of the second thickness of a second portion covering the second surface.

Abstract: A positive electrode includes a positive electrode substrate and a positive electrode active material layer disposed on at least one surface of the positive electrode substrate. The positive electrode active material layer contains a positive electrode active material, a binder, and an electroconductive agent. The positive electrode active material layer contains, as the electroconductive agent, a string-shaped agglomerate formed of fibrous carbons gathered and entangled with each other. The agglomerate has a length of 30 ?m or more.

Abstract: A negative electrode active material slurry is applied to one surface of a strip-shaped negative electrode core so as to form multiple lines of the negative electrode active material slurry, the lines extending in an X direction and being spaced from each other in a Y direction. Subsequently, while keeping the negative electrode core aloft, first hot air is blown toward the negative electrode core from at least a lower side in a vertical direction, and then, while keeping the negative electrode core aloft, first cooling air having a lower temperature than the first hot air is blown toward the negative electrode core from at least the lower side in the vertical direction so as to decrease the temperature of the negative electrode core to 40° C. or lower.

Abstract: A secondary battery includes a battery case and an electrode assembly housed therein. The electrode assembly includes a positive electrode plate including a positive electrode current collector and a positive electrode active material layer placed thereon and a negative electrode plate including a negative electrode current collector composed of copper foil or copper alloy foil and a negative electrode active material layer placed thereon. The negative electrode current collector is connected to a negative electrode external terminal attached to the battery case with a negative electrode current-collecting lead therebetween. The negative electrode current collector and the negative electrode current-collecting lead are joined together with a resistance weld.

Abstract: Disclosed is a method for manufacturing a positive electrode including a positive electrode substrate made of aluminum foil and a positive electrode active material layer containing a positive electrode active material on the positive electrode substrate. This method includes the steps of forming the positive electrode active material layer on the positive electrode substrate; forming a protective layer on the positive electrode substrate; stretching an exposed region of the positive electrode substrate after the steps of forming the active material layer and the protective layer; and compressing the positive electrode active material layer after the stretching step.

Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes a negative electrode including a negative electrode core and negative electrode mixture layers formed on both surfaces of the negative electrode core. Each of the negative electrode mixture layers contains a cellulose-based binder composed of at least one of carboxymethyl cellulose and a salt thereof. When each of the negative electrode mixture layers is divided in half, at the center in the thickness direction, into a first region near the negative electrode core and a second region far from the negative electrode core, the content of the cellulose-based binder present in the first region is 35% by mass or more and less than 50% by mass of the total mass of the cellulose-based binder contained in the entire of each of the negative electrode mixture layers.

Abstract: Disclosed is a method for manufacturing a positive electrode including a positive electrode substrate made of aluminum foil and a positive electrode active material layer containing a positive electrode active material on the positive electrode substrate. This method includes the steps of stretching a first exposed region of the positive electrode substrate with a first stretching roller disposed upstream; stretching a second exposed region of the positive electrode substrate with a second stretching roller disposed downstream; and compressing the positive electrode active material layer with a pair of compression rollers.

Abstract: A nonaqueous electrolyte secondary battery includes a first electrode plate including a core plate and an active material layer including an active material and a binder, and disposed on a surface of the core plate; a second electrode plate; and a nonaqueous electrolyte. When the surface of the active material layer in contact with the core plate is taken as zero point, the amount of the binder in a 0%-10% thickness region X is 8.5 to 9.5 mass % of the total amount of the binder in the active material layer, the amount of the binder in a 90%-100% thickness region Y is 9.5 to 11.5 mass % of the total amount of the binder in the active material layer, and a binder-richest portion across the thickness of the active material layer resides in a 55%-100% thickness region across the thickness of the active material layer.