Abstract: Provided is a separator including a first later consisting of a porous polyolefin and a secondary battery utilizing the separator. The first layer exhibits a temperature-increase convergence time equal to or longer than 2.9 s·m2/g and equal to or shorter than 5.7 s·m2/g when the first layer is irradiated with a microwave having a frequency of 2455 MHz and an output power of 1800 W after being dipped in N-methylpyrrolidone containing 3 wt % of water. A minimum height of a ball placed over the first layer and having a diameter of 14.3 mm and a weight of 11.9 g is equal to or more than 50 cm and equal to or less than 150 cm, the minimum height causing a split in the first layer when the ball freely falls on the first layer.

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: Provided is a separator including a first later consisting of a porous polyolefin and a secondary battery utilizing the separator. The first layer exhibits a temperature-increase convergence time equal to or longer than 2.9 s·m2/g and equal to or shorter than 5.7 s·m2/g when the first layer is irradiated with a microwave having a frequency of 2455 MHz and an output power of 1800 W after being dipped in N-methylpyrrolidone containing 3 wt % of water. A minimum height of a ball placed over the first layer and having a diameter of 14.3 mm and a weight of 11.9 g is equal to or more than 50 cm and equal to or less than 150 cm, the minimum height causing a split in the first layer when the ball freely falls on the first layer.

Abstract: A separator including a first layer consisting of a porous polyolefin and a secondary battery including the separator are provided. The first layer has a parameter X, defined by the following equation, equal to or more than 0 and equal to or less than 20 and a minimum height of a ball in a falling-ball test of the first layer equal to or more than 50 cm and equal to or less than 150 cm. Here, MD tan ? and TD tan ? are respectively loss tangents in flow and width directions obtained by a viscoelasticity measurement of the first layer at a temperature of 90° C.

Abstract: A separator that can be used for a secondary battery and a secondary battery including the separator are described. The separator includes a first layer containing a porous polyolefin. A parameter X in the equation below obtained by a viscoelastic measurement at a frequency of 10 Hz and a temperature of 90° C. is equal to or less than 20. The tearing strength of the first layer measured by the Elmendorf tearing method (in accordance with JIS K 7128-2) is at least 1.5 mN/?m, and a tensile elongation value of the first layer is at least 0.5 mm until a load decreases to 25% of a maximum load in a load-elongation curve in a tearing strength measurement by the right-angled tearing method (in accordance with JIS K 7128-3).

Abstract: Provided is a separator capable of suppressing an increase in internal resistance and a decrease in a battery performance. A separator having a first layer consisting of a porous polyolefin and an organic antioxidant and a secondary battery including the separator are provided. The first layer has a parameter X, defined by the following equation, equal to or more than 0 and equal to or less than 20, X = 100 ? ? M ? ? D ? ? tan ? ? ? - T ? ? D ? ? tan ? ? ? ? ? M ? ? D ? ? tan ? ? ? + T ? ? D ? ? tan ? ? ? 2 where MD tan ? and TD tan ? are respectively a loss tangent in a flow direction and a loss tangent in a width direction which are obtained by a viscoelasticity measurement of the first layer at a temperature of 90° C. and a frequency of 10 Hz. A white index of the first layer is equal to or more than 85 and equal to or less than 98.

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: 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: An adhesive layer disposed between a separator for a secondary battery and an electrode for a secondary battery, wherein the adhesive layer is obtained by bonding under pressure a layer containing a resin having a structural unit derived from an ?-olefin having 2 to 4 carbon atoms, and an occupancy area of the resin in the adhesive layer is 10 to 80%.

Abstract: A nonaqueous electrolyte secondary battery porous layer is provided which contains a filler including a benzendiol-aldehyde resin. The porous layer provides a nonaqueous electrolyte secondary battery with improved long-term cycle characteristics.

Abstract: Provided as a nonaqueous electrolyte secondary battery insulating porous layer that allows a nonaqueous electrolyte secondary battery to have an improved discharge output characteristic is a nonaqueous electrolyte secondary battery insulating porous layer containing fine particles of a metal salt having a Lewis acid peak area within a range of not less than 0.2 g?1 and not more than 3.6 g?1 per unit weight, the Lewis acid peak area being measured by an infrared spectroscopy-based acid nature evaluation method for a solid surface, the Lewis acid peak area of a metal salt per unit weight being defined as a value resulting from dividing (i) the area of a peak present in a region of 1447 cm?1 to 1460 cm?1 of an infrared absorption spectrum measured of a sample on which pyridine was adsorbed and from which the pyridine has then been desorbed by (ii) the weight of the metal salt.

Abstract: A nonaqueous electrolyte secondary battery separator having a laminated body which is not easily curled is provided. The laminated body includes a porous base material containing a polyolefin-based resin as a main component and a porous layer which is disposed on at least one surface of the porous base material and which contains a polyvinylidene fluoride-based resin. The porous base material has a piercing strength of not less than 26.0 gf/g/m2. The polyvinylidene fluoride-based resin contains crystal form ? in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form ? and crystal form ? contained in the polyvinylidene fluoride-based resin.

Abstract: To afford a laminated body that is usable as a nonaqueous electrolyte secondary battery separator and that is not easily curled, a laminated body includes: a porous base material containing a polyolefin-based resin as a main component; and a porous layer containing a polyvinylidene fluoride-based resin, the porous base material having a parameter X of not more than 20, the parameter X being calculated in accordance with a particular formula, the polyvinylidene fluoride-based resin containing crystal form ? in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form ? and crystal form ? contained in the polyvinylidene fluoride-based resin.

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 laminated separator for a nonaqueous electrolyte secondary battery, (i) includes a porous film and a porous layer containing a polyvinylidene fluoride-based resin and (ii) has an excellent rate characteristic. The laminated separator includes the porous film containing a polyolefin-based resin as a main component and the porous layer containing the polyvinylidene fluoride-based resin, in which a surface of the porous layer has a 60-degree specular gloss of 3% to 26%.

Abstract: A nonaqueous electrolyte secondary battery separator that is not easily curled is provided by a laminated body including a porous base material containing a polyolefin-based resin and a porous layer on at least one surface of the porous base material. The difference between the white index of a surface of the porous base material after being irradiated with ultraviolet light with an intensity of 255 W/m2 for 75 hours and the white index of the surface of the porous base material before irradiation is not more than 2.5. The porous layer contains a polyvinylidene fluoride-based resin which contains crystal form ? in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form ? and crystal form ? contained in the resin.

Abstract: A separator and a secondary battery including the separator are described. The separator includes a first layer consisting of porous polyolefin. A temperature-increase convergence time to the amount of a resin in the first layer per unit area is at least 2.9 s·m2/g and equal to or shorter than 5.7 s·m2/g when the layer is irradiated with a microwave (frequency 2455 MHz, output of 1800W) after being impregnated with N-methylpyrrolidone containing 3 wt % of water. The tearing strength of the first layer measured by the Elmendorf tearing method (JIS K 7128-2) is at least 1.5 mN/?m, and a tensile elongation value of the first layer is at least 0.5 mm until a load decreases to 25% of a maximum load from when the load reaches the maximum load in a load-elongation curve in the tearing strength measurement (JIS K 7128-3) by the right-angled tearing method.

Abstract: Provided is a separator capable of suppressing an increase in internal resistance and a decrease in a battery performance. A separator having a first layer consisting of a porous polyolefin and an organic antioxidant and a secondary battery including the separator are provided. The first layer has a parameter X, defined by the following equation, equal to or more than 0 and equal to or less than 20, X = 100 ? ? ? MD ? ? tan ? ? ? - TD ? ? tan ? ? ? ? ? MD ? ? tan ? ? ? + TD ? ? tan ? ? ? ? 2 where MD tan ? and TD tan ? are respectively a loss tangent in a flow direction and a loss tangent in a width direction which are obtained by a viscoelasticity measurement of the first layer at a temperature of 90° C. and a frequency of 10 Hz. A white index of the first layer is equal to or more than 85 and equal to or less than 98.

Abstract: Provided is a separator including a separator which consists of a porous polyolefin of 95 wt % or more and an organic additive. A temperature-increase convergence time of the first layer is equal to or longer than 2.9 s·m2/g and equal to or shorter than 5.7 s·m2/g when the first layer is irradiated with a microwave having a frequency of 2455 MHz and an output power of 1800 W after dipping the first layer in N-methylpyrrolidone containing 3 wt % of water, whereas a white index is equal to or more than 86 and equal to or less than 98.

Abstract: A laminated body includes: a porous base material containing a polyolefin-based resin as a main component, the porous base material having a predetermined phase difference and porosity; and a porous layer disposed on at least one surface of the porous base material, the porous layer containing a polyvinylidene fluoride-based resin, the polyvinylidene fluoride-based resin containing crystal form ? in an amount of not less than 34 mol % with respect to 100 mol % of a total amount of the crystal form ? and crystal form ? contained in the polyvinylidene fluoride-based resin.