Abstract: A nonaqueous electrolyte secondary battery, including: a nonaqueous electrolyte secondary battery separator having a capacitance of not less than 0.0145 nF and not more than 0.0230 nF per measurement area of 19.6 mm2; a positive electrode plate having a capacitance of not less than 1 nF and not more than 1000 nF per measurement area of 900 mm2; and a negative electrode plate having a capacitance of not less than 4 nF and not more than 8500 nF per measurement area of 900 mm2, is excellent in discharge output characteristic.

Abstract: In a porous layer of the present invention, in a case where a surface of the porous layer is divided into 32 sections, a degree of variability in voidage that is measured in the 32 sections is 16.0% or lower. Each of the 32 sections is a square whose longitudinal length is 2.3 ?m and transverse length is 2.3 ?m. The porous layer of the present invention and a separator formed by laminating the porous layer are suitable as a member for a non-aqueous electrolyte secondary battery.

Abstract: Provided is a nonaqueous electrolyte secondary battery including a porous film containing polyolefin as a main component, the nonaqueous electrolyte secondary battery separator having a parameter X of not more than 20, the parameter X being calculated based on the following equation: X=100×|MD tan ??TD tan ?|/{(MD tan ?+TD tan ?)/2}, where MD tan ? is tan ? in a machine direction of the porous film and TD tan ? is tan ? in a transverse direction of the porous film, MD tan ? and TD tan ? each being obtained by viscoelasticity measurement carried out with respect to the porous film at a frequency of 10 Hz and a temperature of 90° C. the nonaqueous electrolyte secondary battery separator making it possible to reduce an increase in internal resistance which increase is caused by repeated charge and discharge.

Abstract: An insulating porous layer for a nonaqueous electrolyte secondary battery having excellent separator resistance is provided. The porous layer contains an inorganic filler and a resin, a central particle diameter of the inorganic filler is in a range of 0.1 ?m to 11 ?m, a BET specific surface area per unit area of the inorganic filler is not greater than 100 m2/g, and the value of formula (1) is in a range of 0.10 to 0.40: [1?T/M]??(1) In formula (1), T and M respectively represent a distance by which the insulating porous layer moves in a traverse direction or a machine direction from a starting point of measurement to a point where a critical load is obtained in a scratch test under a constant load of 0.1 N.

Abstract: A nonaqueous electrolyte secondary battery insulating porous layer which has an excellent discharge output characteristic is provided. The insulating porous layer is arranged such that an aspect ratio of a projection image of an inorganic filler at a surface of the insulating porous layer is in a range of 1.4 to 4.0 and respective peak intensities I(hkl) and I(abc) of any diffraction planes (hkl) and (abc) of the insulating porous layer satisfy the following Formula (1). The peak intensities obtained from the diffraction planes (hkl) and (abc) orthogonal to each other are measured using a wide-angle X-ray diffraction method, and a maximum value of the peak intensity ratio is in a range of 1.5 to 300 when calculated by the following Formula (2): I(hkl)>I(abc)??(1) I(hkl)/I(abc)??(2).

Abstract: A nonaqueous electrolyte secondary battery insulating porous layer usable as a member of a nonaqueous electrolyte secondary battery having an excellent cycle characteristic is provided. A nonaqueous electrolyte secondary battery insulating porous layer includes a thermoplastic resin, porosity of the nonaqueous electrolyte secondary battery insulating porous layer being not less than 25% and not more than 80%, and a ratio of a displacement amount of the nonaqueous electrolyte secondary battery insulating porous layer at tenth loading-unloading cycle to a displacement amount of the nonaqueous electrolyte secondary battery insulating porous layer at fiftieth loading-unloading cycle being not less than 100% and less than 115%.

Abstract: A nonaqueous electrolyte secondary battery insulating porous layer having which is excellent in heat resistance and oxidation resistance in a battery is realized. A nonaqueous electrolyte secondary battery insulating porous layer includes aromatic polyester containing (A) a unit derived from aromatic hydroxycarboxylic acid, (B) a unit derived from aromatic dicarboxylic acid, (C) a unit derived from aromatic amine, selected from aromatic diamine and aromatic amine containing a hydroxyl group, and (D) a unit derived from aromatic diol, in respective predetermined ratios.

Abstract: As a nonaqueous electrolyte secondary battery separator that is excellent in initial battery resistance characteristic of a nonaqueous electrolyte secondary battery including the nonaqueous electrolyte secondary battery separator, provided is a nonaqueous electrolyte secondary battery separator including: a polyolefin porous film, the polyolefin porous film having an internal fractal dimension of 1.75 to 1.91, the internal fractal dimension being measured, by a box counting method, in accordance with a continuous image of the polyolefin porous film which continuous image is formed so as to extend from a surface of the polyolefin porous film in an internal thickness direction of the polyolefin porous film, and in which continuous image a void part and a resin part of the polyolefin porous film are shown at respective two gray levels.

Abstract: The present invention provides a nonaqueous electrolyte secondary battery separator that makes it possible to provide a nonaqueous electrolyte secondary battery having a low electrode resistance changing rate after a first charge and discharge of the nonaqueous electrolyte secondary battery. The nonaqueous electrolyte secondary battery separator includes a polyolefin porous film, wherein a magnitude of a slope of a tangent in a region I of an ultrasonic attenuation rate curve of the nonaqueous electrolyte secondary battery separator immersed in an electrolyte is not less than 3600 mV/s to not more than 9000 mV/s.

Abstract: The present invention provides a nonaqueous electrolyte secondary battery separator that makes it possible to provide a nonaqueous electrolyte secondary battery having a low battery resistance after an aging charge and discharge of the nonaqueous electrolyte secondary battery and a low battery resistance after repetition of a charge and discharge cycle. The nonaqueous electrolyte secondary battery separator includes a polyolefin porous film, wherein a magnitude of a slope of a tangent in a region III of an ultrasonic attenuation rate curve of the nonaqueous electrolyte secondary battery separator immersed in an electrolyte is not less than 3.5 mV/s to not more than 14 mV/s.

Abstract: A nonaqueous electrolyte secondary battery separator including a polyolefin porous film, wherein a magnitude of a slope of a tangent in a region II of an ultrasonic attenuation rate curve of the nonaqueous electrolyte secondary battery separator immersed in an electrolyte is not less than 100 mV/s to not more than 1450 mV/s, makes it possible to provide a nonaqueous electrolyte secondary battery having a low battery resistance increasing rate after charge and discharge (after a degassing operation).

Abstract: As a nonaqueous electrolyte secondary battery separator used to produce a nonaqueous electrolyte secondary battery which is low in resistance increasing rate in a case where the nonaqueous electrolyte secondary battery is repeatedly subjected to a charge-discharge cycle, the present invention provides a nonaqueous electrolyte secondary battery separator which includes a polyolefin porous film, the nonaqueous electrolyte secondary battery separator having ion permeability barrier energy of not less than 300 J/mol/?m and not more than 900 J/mol/?m.

Abstract: To provide a nonaqueous electrolyte secondary battery separator that allows a nonaqueous electrolyte secondary battery including the nonaqueous electrolyte secondary battery separator to have an excellent cycle characteristic, a nonaqueous electrolyte secondary battery separator has, over a 10 ?m×10 ?m region of a polyolefin porous film included therein, an average outermost surface area within a range of not less than 105.5 ?m2 and not more than 115.5 ?m2 as measured with use of a scanning probe microscope.

Abstract: A roll is made of a porous film in a belt-like shape, the porous film having a width of not smaller than 20 mm. In a case where a roughness along a width direction of an outermost surface of the roll is measured at 1 mm intervals across an entire width of the outermost surface, a difference between a maximum roughness value and a minimum roughness value in a distance of 20 mm in the width direction of the outermost surface is less than 25 ?m.

Abstract: A nonaqueous secondary battery separator, disposed between a cathode and an anode, includes: a porous base material containing a polyolefin as a main component; and a porous layer containing a polyvinylidene fluoride-based resin on at least one surface of the porous base material. The separator satisfies (C)/(D)?0.13, where (C) represents the average pore diameter (?m) of the porous base material, and (D) represents the porosity of the porous base material, in the porous layer after being immersed for 24 hours in an electrolyte solution having a temperature of 25° C. in which electrolyte solution LiPF6 having a concentration of 1.0 mole per liter is dissolved in a mixed solvent containing ethyl methyl carbonate, diethyl carbonate, and ethylene carbonate at a volume ratio of 50:20:30, the resin having absorbed the electrolyte solution having a volume of 0.05 to 5.00 cm3 per square meter of the porous layer.

Abstract: The present invention provides a laminated separator, for a nonaqueous electrolyte secondary battery, suppressing a deterioration in cycle characteristic. The laminated separator includes: a porous film containing a polyolefin-based resin; and a porous layer, a surface of the porous layer having a 60-degree specular gloss of 3% to 26%, a volume per unit area of the porous layer being 0.1 cm3/m2 to 2.5 cm3/m2.

Abstract: The present invention provides, as a porous layer that can be used for a member for a nonaqueous secondary battery having excellent shutdown characteristics, a porous layer including a polyvinylidene fluoride-based resin, wherein, assuming that a sum of individual amounts of crystal form ? and crystal form ? contained in the polyvinylidene fluoride-based resin is 100 mol %, the amount of crystal form ? contained in the polyvinylidene fluoride-based resin is not less than 10 mol % and not more than 65 mol %.

Abstract: Provided is a laminate which is capable of ensuring a high level of safety by preventing an internal short circuit due to, for example, breakage of a non-aqueous electrolyte secondary battery while maintaining various performance capabilities of the non-aqueous electrolyte secondary battery. A laminate (10) includes: a porous film containing polyolefin as a main component; and a porous layer containing fine particles; the porous layer being laminated to at least one side of the porous film, in an electrical conduction test by nail penetration in which test a displacement in a thickness direction of the laminate (10) during a period from when a dielectric breakdown occurs in the laminate (10) to when the laminate (10) is brought into electrical conduction is measured by use of a nail (2) of N50 specified in JIS A 5508 and under a condition in which the nail (2) descends at a descending speed of 50 ?m/min, the displacement being not less than 20 ?m and not more than 200 ?m.

Abstract: An embodiment of the present invention provides a nonaqueous electrolyte secondary battery laminated separator having an excellent initial rate characteristic. The present nonaqueous electrolyte secondary battery laminated separator includes: a porous film containing a polyolefin-based resin; and a porous layer containing inorganic particles which have a thermal expansion coefficient of not more than 11 ppm/° C. in a temperature range of ?40° C. to 200° C., the porous layer having a surface temperature increase rate of not more than 1.25° C./sec.

Abstract: Provided is a laminate which is capable of ensuring a high level of safety by preventing an internal short circuit due to, for example, breakage of a non-aqueous electrolyte secondary battery while maintaining various performance capabilities of the non-aqueous electrolyte secondary battery.