Abstract: A negative electrode slurry for a lithium ion secondary battery, according to an aspect of the present disclosure, comprises a negative electrode active material, a thickener, a preservative component, and a solvent, the thickener comprising carboxymethyl-cellulose or a salt thereof, the solvent comprising water, and the preservative component comprising a cyclic hydroxamic acid ethanolamine salt.

Abstract: A negative electrode slurry for a lithium ion secondary battery, according to the present disclosure, is characterized by comprising a negative electrode active material, a thickener, a preservative component, and a solvent, the thickener comprising carboxymethyl-cellulose or a salt thereof, the solvent comprising water, and the preservative component comprising a compound having a tropone skeleton.

Abstract: A positive electrode for a non-aqueous electrolyte secondary battery includes a positive electrode current collector, a protective layer provided on a surface of the positive electrode current collector, and a positive electrode composite material layer containing a positive electrode active material provided on a surface of the protective layer. The protective layer includes an insulating filler, a binder, and a conductive material. The protective layer is composed of a central portion and an end portion in a plan view as seen from the stacking direction. The ratio of the conductive material in the end portion of the protective layer is smaller than the ratio of the conductive material in the central portion of the protective layer. The ratio Sc/S of the area Sc of the end portion of the protective layer to the total area S of the protective layer in plan view is 0.12 or more.

Abstract: A lithium ion secondary battery, improved in durability against high-rate charging/discharging, which includes, in the negative electrode active material layer, a negative electrode active material formed of a graphite carbon material having a graphite structure in at least a part thereof, and a conductive carbon material, which is different from the graphite carbon material and is formed of a conductive amorphous carbon. The negative electrode active material has a bulk density of 0.5 g/cm3 or more and 0.7 g/cm3 or less, and a BET specific surface area of 2 m2/g or more and 6 m2/g or less. The conductive carbon material has a bulk density of 0.4 g/cm3 or less, and a BET specific surface area of 50 m2/g or less.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive electrode current collector, a first positive electrode mixture layer that is provided on the positive electrode current collector, and a second positive electrode mixture layer that is provided on the first positive electrode mixture layer. The first positive electrode mixture layer includes a first positive electrode active material and a first conductive material. The second positive electrode mixture layer includes a second positive electrode active material and a second conductive material. The first positive electrode active material includes a lithium composite oxide having a layered crystal structure. The second positive electrode active material includes a lithium composite phosphate having an olivine-type crystal structure.

Abstract: A non-aqueous electrolyte secondary battery includes a positive electrode composite material layer, the positive electrode composite material layer including: a composite particle including a positive electrode active material, a first conductive material and a binder; and a second conductive material arranged on a surface of the composite particle and having a DBP oil absorption number smaller than that of the first conductive material.

Abstract: A method of manufacturing a non-aqueous electrolyte solution secondary battery includes: (A) preparing a first composite material by mixing a first positive electrode active material, a first conductive material and a first binder; (B) preparing a second composite material by mixing a second positive electrode active material, a second conductive material and a second binder; and (C) manufacturing a positive electrode by forming a positive electrode composite layer including the first composite material and the second composite material. The first positive electrode active material has an average discharge potential lower than that of the second positive electrode active material. The first conductive material has a first OAN. The second conductive material has a second OAN. A ratio of the second OAN to the first OAN is 1.3 or more and 2.1 or less. A sum of the first OAN and the second OAN is 31.64 ml/100 g or less.

Abstract: A positive electrode for a non-aqueous electrolyte secondary battery includes a positive electrode current collector, a protective layer provided on a surface of the positive electrode current collector, and a positive electrode composite material layer containing a positive electrode active material provided on a surface of the protective layer. The protective layer includes an insulating filler, a binder, and a conductive material. The protective layer is composed of a central portion and an end portion in a plan view as seen from the stacking direction. The ratio of the conductive material in the end portion of the protective layer is smaller than the ratio of the conductive material in the central portion of the protective layer. The ratio Sc/S of the area Sc of the end portion of the protective layer to the total area S of the protective layer in plan view is 0.12 or more.

Abstract: A method of manufacturing a non-aqueous electrolyte solution secondary battery includes: (A) preparing a first composite material by mixing a first positive electrode active material, a first conductive material and a first binder; (B) preparing a second composite material by mixing a second positive electrode active material, a second conductive material and a second binder; and (C) manufacturing a positive electrode by forming a positive electrode composite layer including the first composite material and the second composite material. The first positive electrode active material has an average discharge potential lower than that of the second positive electrode active material. The first conductive material has a first OAN. The second conductive material has a second OAN. A ratio of the second OAN to the first OAN is 1.3 or more and 2.1 or less. A sum of the first OAN and the second OAN is 31.64 ml/100 g or less.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive electrode current collector, a first positive electrode mixture layer that is provided on the positive electrode current collector, and a second positive electrode mixture layer that is provided on the first positive electrode mixture layer. The first positive electrode mixture layer includes a first positive electrode active material and a first conductive material. The second positive electrode mixture layer includes a second positive electrode active material and a second conductive material. The first positive electrode active material includes a lithium composite oxide having a layered crystal structure. The second positive electrode active material includes a lithium composite oxide having an olivine-type crystal structure.

Abstract: The present teaching provides a lithium ion secondary battery particularly improved in durability against high-rate charging/discharging. The lithium ion secondary battery of the present teaching includes, in the negative electrode active material layer, a negative electrode active material formed of a graphite type carbon material having a graphite structure in at least a part thereof, and a conductive carbon material, which is different from the graphite type carbon material and is formed of a conductive amorphous carbon. The negative electrode active material has a bulk density of 0.5 g/cm3 or more and 0.7 g/cm3 or less, and a BET specific surface area of 2 m2/g or more and 6 m2/g or less. The conductive carbon material has a bulk density of 0.4 g/cm3 or less, and a BET specific surface area of 50 m2/g or less.

Abstract: The present invention provides a cathode active material that makes possible a high capacity nonaqueous electrolyte secondary battery that has excellent discharge load characteristics that provide both good cycle characteristics and thermal stability. The cathode active material comprises a lithium nickel composite oxide having the compositional formula LiNi1?aMaO2 (where, M is at least one kind of element that is selected from among a transitional metal other than Ni, a group 2 element, and group 13 element, and 0.01?a?0.5) to which fine lithium manganese composite oxide particle adhere to the surface thereof. This lithium nickel composite oxide is obtained by adding manganese salt solution to a lithium nickel composite oxide slurry, causing manganese hydroxide that contains lithium to adhere to the surface of the lithium nickel composite oxide particles, and then baking that lithium nickel composite oxide.

Abstract: A non-aqueous electrolyte secondary battery includes a positive electrode composite material layer, the positive electrode composite material layer including: a composite particle including a positive electrode active material, a first conductive material and a binder; and a second conductive material arranged on a surface of the composite particle and having a DBP oil absorption number smaller than that of the first conductive material.

Abstract: A method for producing a non-aqueous electrolyte secondary battery includes: subjecting a mixture of a negative-electrode active material on which oil has been adsorbed, CMC and water to hard kneading to prepare a primary kneaded mixture; diluting the primary kneaded mixture with water to prepare a slurry; and adding a binder to the slurry. The method further includes defining an amount of the oil to a value equal to or more than 50 ml/100 g and equal to or less than 62 ml/100 g, wherein the amount of the oil is an amount at the time when the viscosity characteristics of the negative-electrode active material exhibits 70% of the maximum torque that is generated when the oil is titrated onto the negative-electrode active material. The 1% aqueous solution viscosity of the CMC is defined to a value equal to or more than 6000 mPa·s and equal to or less than 8000 mPa·s.

Abstract: A non-aqueous electrolyte secondary battery includes an electrode wound body formed by winding positive and negative electrode sheets with separators interposed therebetween. The positive electrode sheet is manufactured through a coating process wherein a positive electrode mixture paste is applied to a current collecting sheet to form a mixture layer. Prior to the coating process, sections of the current collecting sheet to be uncoated and to be coated are differentiated in terms of wettability. Alternatively, a positive electrode mixture paste with viscosities at slow and fast shear velocities within a predetermined range is used. Thus, the cross-sectional shape of the width-direction end of the mixture layer includes a steep cross-sectional shape, wherein the width of a section as thin as or thinner than 50% of a thickness of a width-direction center flat portion of the mixture layer is 100 ?m or less.

Abstract: An electrode manufacturing method includes: a coating process of applying a coating material to a metal foil while the metal foil is fed forward to form a coated foil; and a drying process of drying the coated foil by heating while the coated foil is fed forward to pass through a drying oven of a drying machine placed in line on a feeding path. The drying oven includes at least a first drying chamber which the coated foil first passes through in the drying process and a second drying chamber which the coated foil passes through following the first drying chamber. The first drying chamber has a smaller area in cross section perpendicular to the feed direction along the feeding path than an area of the second drying chamber to provide a smaller volume than a volume of the second drying chamber.

Abstract: An object of the present invention is to provide an electrode for a lithium ion secondary battery that can ensure a high level of safety even when exposed to severe conditions such as a nail penetration test or crush test, and exhibit excellent output characteristics. The present invention relates to an electrode for a lithium ion secondary battery having a material mixture containing active material particles capable of reversibly absorbing and desorbing lithium, and a current collector that carries the material mixture, wherein a surface of the current collector has recessed portions, and an area occupied by the recessed portions accounts for not less than 30% of an a material mixture carrying area of the current collector.

Abstract: A method for producing a non-aqueous electrolyte secondary battery includes: subjecting a mixture of a negative-electrode active material on which oil has been adsorbed, CMC and water to hard kneading to prepare a primary kneaded mixture; diluting the primary kneaded mixture with water to prepare a slurry; and adding a binder to the slurry. The method further includes defining an amount of the oil to a value equal to or more than 50 ml/100 g and equal to or less than 62 ml/100 g, wherein the amount of the oil is an amount at the time when the viscosity characteristics of the negative-electrode active material exhibits 70% of the maximum torque that is generated when the oil is titrated onto the negative-electrode active material. The 1% aqueous solution viscosity of the CMC is defined to a value equal to or more than 6000 mPa·s and equal to or less than 8000 mPa·s.

Abstract: A non-aqueous electrolyte secondary battery includes a mixture layer of a negative electrode. The mixture layer contains carboxymethyl cellulose. A product of a median diameter (?m) of a negative electrode active material contained in the negative electrode and a ratio of a weight (wt %) of the carboxymethyl cellulose adsorbed on the negative electrode active material to a weight of the negative electrode active material is not less than 2.2 and not larger than 4.2.

Abstract: A non-aqueous electrolyte secondary battery with excellent discharge cycle characteristics and a charging termination potential ranging from 4.4 to 4.6 V based on lithium, consisting of a positive electrode comprising a positive electrode active material, a negative electrode, and a non-aqueous electrolyte containing a non-aqueous solvent and an electrolyte salt, in which the positive electrode active material comprises a mixture of a lithium-cobalt composite oxide containing at least both zirconium and magnesium in LiCoO2, and a lithium-manganese-nickel composite oxide having a layered structure and containing at least both manganese and nickel, and the potential of the positive electrode active material ranges from 4.4 to 4.6 V based on lithium, and the non-aqueous electrolyte contains at least one of aromatic compounds selected from the group consisting at least of toluene derivatives, anisole derivatives, biphenyl, cyclohexyl benzene, tert-butyl benzene, tert-amyl benzene, and diphenyl ether.