Abstract: An object of the present disclosure is to provide a nonaqueous electrolyte secondary battery separator which has high heat resistance and is resistant to the detachment of a heat resistant layer. A nonaqueous electrolyte secondary battery according to an example embodiment includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The separator includes a polyolefin substrate and a heat resistant layer disposed on a side of the substrate. The heat resistant layer includes an aramid resin, and the aramid resin has a ratio (B/A) of 0.94 to 1.14 wherein A is the absorbance at a wavelength of 1318 cm?1 and B is the absorbance at a wavelength of 1650 cm?1 in an infrared absorption spectrum obtained by infrared spectroscopic measurement.

Abstract: An anastomosis assist tool comprises a body unit extending in a predetermined advancing direction, and an insertion unit arranged at the tip of the body unit. The body unit includes an anastomosis assist part having an approximately constant cross-sectional shape in a plane perpendicular to the advancing direction. The anastomosis assist part includes a projection projecting outwardly as viewed in the cross section and extending in the advancing direction. The insertion unit includes a tapered part of a diameter decreasing gradually toward a tip. When the insertion unit and a part of the body unit are inserted into a vessel, the projection of the anastomosis assist part of the body unit abuts on the inner wall of the vessel. This makes it unlikely that the inner wall of the vessel will stick to the body unit at a site other than a point abutting on the projection.

Abstract: A nonaqueous electrolyte secondary battery is disclosed including a flat electrode body in which an electrode group including a positive electrode plate, a negative electrode plate, and a separator interposed therebetween is rolled, a nonaqueous electrolyte, and an outer jacket member. The electrode body includes bent portions, in which an electrode group is bent, at both end portions in the major axis direction of a cross section perpendicular to a rolling axis. A resin tape is attached to a portion, which is arranged nearest the rolling start position of the positive electrode plate, of the roll inner surface of the positive electrode mix layer in the bent portion. The resin tape includes an adhesive layer and a base material layer that does not pass lithium ions. An adhesive force of the resin tape to the positive electrode mix layer is 0.1 N/cm or more and 2 N/cm or less.

Abstract: A non-aqueous electrolyte secondary battery having a long cycle life and generates a small amount of gas during, for example, storage in a charged state. A negative electrode in a non-aqueous electrolyte secondary battery according to an exemplary embodiment includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector. The negative electrode mixture layer contains a water-soluble polymer and a negative electrode active material containing a silicon-based active material. The water-soluble polymer contains 0.30 mol/100 g or more and 0.40 mol/100 g or less of an acrylic acid monomer unit and 10?4 mol/100 g or more and 10?3 mol/100 g or less of a tetrafunctional (meth)acrylate monomer unit. An aqueous solution containing 1% by mass of the polymer in terms of solid content has a viscosity of 0.05 Pa·s or higher and 0.70 Pa·s or lower.

Abstract: Gas evolution during the high-temperature storage of a non-aqueous electrolyte secondary battery is suppressed to improve the high-temperature storage characteristics of the non-aqueous electrolyte secondary battery. A negative electrode for a non-aqueous electrolyte secondary battery contains silicon-containing particles and graphite particles. A covering layer is disposed on each of the graphite particles. The covering layer contains a first covering material and a second covering material, the first covering material containing particles that can be made to swell with a non-aqueous electrolytic solution, the second covering material containing a water-soluble polymer material. The first covering material is disposed on a surface of each of the graphite particles. The mass ratio of the second covering material to the first covering material is higher than 1.

Abstract: A non-aqueous electrolyte secondary battery including a silicon material as a negative electrode active material has good discharge rate characteristics. A negative electrode according to an exemplary embodiment includes a negative-electrode current collector and a negative-electrode mixture layer formed on the current collector. The negative-electrode mixture layer contains graphite and a silicon material. A first region that extends from the surface of the mixture layer remote from the negative-electrode current collector in the thickness direction of the negative-electrode mixture layer and has a thickness equal to 40% of the thickness of the mixture layer contains a larger amount of the silicon material than a second region that extends from the surface of the mixture layer adjacent to the negative-electrode current collector and has a thickness equal to 40% of the thickness of the mixture layer. The first region has a lower density than the second region.

Abstract: A non-aqueous electrolyte secondary battery having a long cycle life and generates a small amount of gas during, for example, storage in a charged state. A negative electrode in a non-aqueous electrolyte secondary battery according to an exemplary embodiment includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector. The negative electrode mixture layer contains a water-soluble polymer and a negative electrode active material containing a silicon-based active material. The water-soluble polymer contains 0.30 mol/100 g or more and 0.40 mol/100 g or less of an acrylic acid monomer unit and 10?4 mol/100 g or more and 10?3 mol/100 g or less of a tetrafunctional (meth)acrylate monomer unit. An aqueous solution containing 1% by mass of the polymer in terms of solid content has a viscosity of 0.05 Pa·s or higher and 0.70 Pa·s or lower.

Abstract: A non-aqueous electrolyte secondary battery including a silicon material as a negative electrode active material has good discharge rate characteristics. A negative electrode according to an exemplary embodiment includes a negative-electrode current collector and a negative-electrode mixture layer formed on the current collector. The negative-electrode mixture layer contains graphite and a silicon material. A first region that extends from the surface of the mixture layer remote from the negative-electrode current collector in the thickness direction of the negative-electrode mixture layer and has a thickness equal to 40% of the thickness of the mixture layer contains a larger amount of the silicon material than a second region that extends from the surface of the mixture layer adjacent to the negative-electrode current collector and has a thickness equal to 40% of the thickness of the mixture layer. The first region has a lower density than the second region.

Abstract: Adhesion between particles in a negative electrode for non-aqueous secondary cells is improved for better cycle characteristics. A negative electrode for non-aqueous secondary cells contains silicon-containing particles and graphite particles as negative electrode active materials. The graphite particles have a first coating layer that contains carboxymethyl cellulose, and the first coating layer has an average thickness of 10 nm or more. The silicon-containing particles have a second coating layer that contains carboxymethyl cellulose, and the second coating layer has an average thickness of 10 nm or more.

Abstract: Gas evolution during the high-temperature storage of a non-aqueous electrolyte secondary battery is suppressed to improve the high-temperature storage characteristics of the non-aqueous electrolyte secondary battery. A negative electrode for a non-aqueous electrolyte secondary battery contains silicon-containing particles and graphite particles. A covering layer is disposed on each of the graphite particles. The covering layer contains a first covering material and a second covering material, the first covering material containing particles that can be made to swell with a non-aqueous electrolytic solution, the second covering material containing a water-soluble polymer material. The first covering material is disposed on a surface of each of the graphite particles. The mass ratio of the second covering material to the first covering material is higher than 1.

Abstract: Provided is a negative electrode for lithium ion secondary batteries, which can enhance the penetration of non-aqueous electrolyte, and can improve the input-output characteristics. The negative electrode includes a negative electrode core material sheet, and a negative electrode material mixture layer supported thereon. The negative electrode material mixture layer includes negative electrode active material particles, and a binder. The negative electrode material mixture layer has a plurality of pores interspersed on the surface and in the interior of the negative electrode material mixture layer. The pores have an average maximum diameter R of 45 to 125 ?m. The pores have a number density of 8 to 17 pores per 1 cm2 of the surface of the negative electrode material mixture layer or per 1 cm2 of a cross section in the plane direction of the negative electrode material mixture layer.

Abstract: In the non-aqueous electrolyte secondary battery of the present invention, the separator includes a heat-resistant resin having chlorine atoms as an end group and the positive electrode active material includes a lithium-containing complex oxide containing aluminum atoms in its composition. Even if the chlorine atoms are liberated into the non-aqueous electrolyte, aluminum contained in the positive electrode active material is selectively leached into the non-aqueous electrolyte, thereby suppressing the leaching of other component elements. Consequently, there can be obtained a non-aqueous electrolyte secondary battery excellent in safety and high temperature storage characteristics.

Abstract: The non-aqueous electrolyte secondary battery of the present invention is provided with an electrode plate group and a non-aqueous electrolyte, the electrode plate group including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, a positive electrode lead connected to the positive electrode, and a negative electrode lead connected to the negative electrode. The energy density of the electrode plate group is 750 Wh/L or higher by volume, and the cross-sectional area of at least one of the positive electrode lead and the negative electrode lead is 5.5×10?5 to 1.2×10?2 cm2.

Abstract: A non-aqueous electrolyte secondary battery including: a positive electrode having a positive electrode material mixture containing a composite lithium oxide; a negative electrode; a polyolefin separator; a non-aqueous electrolyte; and a heat-resistant insulating layer interposed between the positive and negative electrodes. The positive electrode material mixture has an estimated heat generation rate at 200° C. of not greater than 50 W/kg. The positive electrode and the negative electrode are wound together with the separator and the heat-resistant insulating layer interposed therebetween.

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: Provided is a negative electrode for lithium ion secondary batteries, which can enhance the penetration of non-aqueous electrolyte, and can improve the input-output characteristics. The negative electrode includes a negative electrode core material sheet, and a negative electrode material mixture layer supported thereon. The negative electrode material mixture layer includes negative electrode active material particles, and a binder. The negative electrode material mixture layer has a plurality of pores interspersed on the surface and in the interior of the negative electrode material mixture layer. The pores have an average maximum diameter R of 45 to 125 ?m. The pores have a number density of 8 to 17 pores per 1 cm2 of the surface of the negative electrode material mixture layer or per 1 cm2 of a cross section in the plane direction of the negative electrode material mixture layer.

Abstract: A negative electrode for a lithium ion secondary battery includes a negative electrode core member and a negative electrode mixture layer adhering to the negative electrode core member. The negative electrode mixture layer includes active material particles, a cellulose ether compound, and rubber particles. The cellulose ether compound has a degree of etherification of 0.25 or more and 0.7 or less and an average degree of polymerization of 20 or more and 1200 or less. The negative electrode mixture layer contains remaining particles including a water-insoluble portion of the cellulose ether compound and having a mean particle size of 1 ?m or more and 75 ?m or less. The bonding strength between the active material particles is 98 N/cm2 or more.

Abstract: A lithium ion secondary battery includes a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator interposed between the positive electrode and the negative electrode. The separator includes a polyolefin layer and an oxidation-resistant layer. The oxidation-resistant layer includes an oxidation-resistant polymer. A main chain of the oxidation-resistant polymer does not include a —CH2— group and a —CH(CH3)— group. The oxidation-resistant layer faces the positive electrode.

Abstract: The invention provides a method for evaluating the safety of a battery under an internal short-circuit condition. The battery includes: an electrode group including a positive electrode, a negative electrode, and an insulating layer for electrically insulating the electrodes, which are wound or laminated; an electrolyte; a housing for housing the electrode group and the electrolyte; and a current-collecting terminal for electrically connecting the electrode group and the housing. The method of the invention includes: placing a foreign object at a location inside the electrode group of the battery where the positive electrode and the negative electrode face each other; and pressing the location by the pressure applied by a pressing tool to locally crush the insulating layer between the positive and negative electrodes, thereby causing an internal short-circuit.

Abstract: A separator for use in a non-aqueous electrolyte secondary battery including a first porous layer (layer A) having a shutdown function which becomes substantially a non-porous layer at a high temperature, and a second porous layer (layer B) including an aramid resin and an inorganic material, wherein a ratio (TA/TB) of a thickness (TA) of the layer A relative to a thickness (TB) of the layer B is 2.5 or more and 13 or less.