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.

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 temperature rise ending period of a particular value with respect to the amount of resin per unit area, 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 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 laminated body being arranged so that: a diminution rate of diethyl carbonate dropped on the porous base material is 15 sec/mg to 21 sec/mg; a spot diameter of the diethyl carbonate 10 seconds after the diethyl carbonate was dropped on the porous base material is not less than 20 mm; and 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. A nonaqueous electrolyte secondary battery separator made of the laminated body is not easily curled.

Abstract: A nonaqueous electrolyte secondary battery includes a separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; and a positive electrode plate and a negative electrode plate for which the sum of the interface barrier energies is not less than a predetermined value, the polyvinylidene fluoride-based resin containing an ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

Abstract: The present invention provides a nonaqueous electrolyte secondary battery in which a decrease in discharge capacity after a charge-discharge cycle is reduced. The nonaqueous electrolyte secondary battery in accordance with an aspect of the present invention includes (i) a positive electrode plate and a negative electrode plate whose results of a scratch test carried out in the TD and the MD fall within predetermined ranges, (ii) a nonaqueous electrolyte secondary battery separator that includes a porous film whose temperature rise ending period with respect to a resin amount per unit area at irradiation with microwave falls within a predetermined range, and (iii) a porous layer that contains an ?-form polyvinylidene fluoride-based resin of a polyvinylidene fluoride-based resin at a predetermined proportion. The porous layer is arranged between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate.

Abstract: A nonaqueous electrolyte secondary battery includes: a separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; a positive electrode plate; and a negative electrode plate, wherein a sum of interface barrier energies being a predetermined value, the polyolefin porous film having a puncture strength of a predetermined value, the value represented by Formula (1) below being not less than 0.00 and not more than 0.54, |1?T/M|?? Formula (1), and the polyvinylidene fluoride-based resin containing an ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

Abstract: A nonaqueous electrolyte secondary battery includes: a separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; and a positive electrode plate and a negative electrode plate for each of which the result of a scratch test in the width direction and the result of a scratch test in the flow direction are each within a predetermined range, the polyvinylidene fluoride-based resin containing an ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

Abstract: A nonaqueous electrolyte secondary battery having an improved restored discharge capacity after high-rate discharge is described, which includes a nonaqueous electrolyte secondary battery separator containing a polyolefin porous film in which (i) a diminution rate of diethyl carbonate dropped on the polyolefin porous film is of 15˜21 sec/mg and (ii) a spot diameter of the diethyl carbonate 10 seconds after the diethyl carbonate is dropped on the polyolefin porous film is not less than 20 mm; a positive electrode plate and a negative electrode plate each having a value represented by the following Formula (1) which value falls within a predetermined range; and a porous layer provided between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate, the porous layer containing a polyvinylidene fluoride-based resin containing an ?-form polyvinylidene fluoride-based resin not less than 35.0 mol %, |1?T/M|??(1).

Abstract: A nonaqueous electrolyte secondary battery including: a nonaqueous electrolyte secondary battery separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; a positive electrode plate having a capacitance falling within a specific range; and a negative electrode plate having a capacitance falling within a specific range, wherein: the polyolefin porous film has a given rate of diminution of diethyl carbonate and a given spot diameter of the diethyl carbonate; the porous layer is provided between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate; and the polyvinylidene fluoride-based resin contained in the porous layer contains an ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

Abstract: A nonaqueous electrolyte secondary battery includes: a separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; a positive electrode plate having a capacitance falling within a specific range; and a negative electrode plate having a capacitance falling within a specific range. The polyolefin porous film has a given piercing strength, having a value of not less than 0.00 and not more than 0.54, the value being represented by the following expression: |1?T/M|, where T and M are distances at which a critical load is reached in a scratch test in which the polyolefin porous film is moved in transverse and machine directions, respectively, under a constant load of 0.1N. The polyvinylidene fluoride-based resin contains an ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

Abstract: A nonaqueous electrolyte secondary battery including: a separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; a positive electrode plate whose active material layer is not peeled from the positive electrode plate until the positive electrode plate is bent 130 or more times; and a negative electrode plate whose active material layer is not peeled from the negative electrode plate until the negative electrode plate is bent 1650 or more times, wherein: diethyl carbonate dropped on the polyolefin porous film diminishes at a rate of 15 sec/mg to 21 sec/mg; the diethyl carbonate has a spot diameter of not less than 20 mm 10 seconds after the diethyl carbonate was dropped on the polyolefin porous film; and the polyvinylidene fluoride-based resin contains an ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

Abstract: A nonaqueous electrolyte secondary battery which satisfies four requirements is provided. A porous layer contains ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol % with respect to 100 mol % of a total amount of (i) the ?-form polyvinylidene fluoride-based resin and (ii) ?-form polyvinylidene fluoride-based resin. A porous film has a temperature rise ending period of 2.9 sec·m2/g to 5.7 sec·m2/g with respect to an amount of a resin per unit area when the porous film is impregnated with N-methylpyrrolidone containing water in an amount of 3% by weight and then (ii) irradiated, at an output of 1,800 W, with a microwave having a frequency of 2,455 MHz. A positive electrode plate has a capacitance of 1 nF to 1000 nF per measurement area of 900 mm2. A negative electrode plate has a capacitance of 4 nF to 8500 nF per measurement area of 900 mm2.

Abstract: A nonaqueous electrolyte secondary battery in accordance with an embodiment of the present invention includes: a separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; a positive electrode plate, a bend number of which being not less than 130, the bend number indicating how many times the positive electrode plate bends before peeling of a positive electrode active material layer occurs; and a negative electrode plate, a bend number of which being not less than 1650, the bend number indicating how many times the negative electrode plate bends before peeling of a negative electrode active material layer occurs, the polyvinylidene fluoride-based resin containing not less than 35.0 mol % of an ?-form polyvinylidene fluoride-based resin.

Abstract: A nonaqueous electrolyte secondary battery in accordance with an embodiment of the present invention includes: a separator including a polyolefin porous film; a porous layer containing a polyvinylidene fluoride-based resin; and a positive electrode plate and a negative electrode plate each of which has a capacitance in a specific range, the polyolefin porous film having a parameter X of not more than 20, and the polyvinylidene fluoride-based resin containing not less than 35.0 mol % of an ?-form polyvinylidene fluoride-based resin.

Abstract: The present invention provides a nonaqueous electrolyte secondary battery in which degradation of electrode plates after charge-discharge cycles is prevented. The nonaqueous electrolyte secondary battery in accordance with an aspect of the present invention includes: (i) a combination of a positive electrode plate and a negative electrode plate in which the sum of interface barrier energies is not less than a predetermined value, (ii) a nonaqueous electrolyte secondary battery separator that includes a porous film whose parameter X falls within a predetermined range, the parameter X being calculated from a tan ? which is obtained through a viscoelasticity measurement, and (iii) a porous layer that contains an ?-form polyvinylidene fluoride-based resin of a polyvinylidene fluoride-based resin at a predetermined proportion. The porous layer is provided between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate.

Abstract: A nonaqueous electrolyte secondary battery has an improved restored discharge capacity after a charge and discharge cycle. The nonaqueous electrolyte secondary battery includes a nonaqueous electrolyte secondary battery separator containing a porous film, the porous film having a parameter (X) of not more than 20. A positive electrode plate and a negative electrode plate each have a value, represented by |1?T/M|. A porous layer is provided between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate. The porous layer contains a polyvinylidene fluoride-based resin which contains an ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.

Abstract: The present invention provides a nonaqueous electrolyte secondary battery in which a good high-rate discharge capacity after charge-discharge cycles is maintained. The nonaqueous electrolyte secondary battery in accordance with an aspect of the present invention includes: (i) a combination of a positive electrode plate and a negative electrode plate in which the sum of interface barrier energies is not less than a predetermined value, (ii) a nonaqueous electrolyte secondary battery separator that includes a porous film whose temperature rise ending period with respect to a resin amount per unit area at irradiation with microwave falls within a predetermined range, and (iii) a porous layer that contains an ?-form polyvinylidene fluoride-based resin of a polyvinylidene fluoride-based resin at a predetermined proportion. The porous layer is provided between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate.

Abstract: A nonaqueous electrolyte secondary battery satisfies the following requirements: (a) in a PVDF-based resin contained in a porous layer, a content of an ?-form PVDF-based resin is above 35.0 mol % with respect to 100 mol % of a total content of ?- and ?-form PVDF-based resins; (b) a porous film has a temperature rise ending time of 2.9-5.7 seconds·m2/g with respect to a resin content per area, wherein the porous film is impregnated with N-methylpyrrolidone containing 3% by weight of water and is irradiated with a 2455 MHz 1800 W microwave; (c) a positive electrode plate, before peeling of its active material layer has more than 130 bends in a folding endurance test with a 1 N load and a 45° bending angle; and (d) a negative electrode plate, before peeling of its active material layer occurs has more than 1650 bends in the folding endurance test.

Abstract: A nonaqueous electrolyte secondary battery in accordance with an embodiment of the present invention includes: a separator including a polyolefin porous film having a parameter X of not more than 20; a porous layer containing a polyvinylidene fluoride-based resin in which a content of an ?-form polyvinylidene fluoride-based resin is not less than 35.0 mol %; a positive electrode plate, a bend number of which being not less than 130, the bend number indicating how many times the positive electrode plate bends before peeling of a positive electrode active material layer occurs; and a negative electrode plate, a bend number of which being not less than 1650, the bend number indicating how many times the negative electrode plate bends before peeling of a negative electrode active material layer occurs.

Abstract: The present invention provides a nonaqueous electrolyte secondary battery containing (i) a separator containing a polyolefin porous film, (ii) a porous layer containing a polyvinylidene fluoride-based resin, (iii) a positive electrode plate having a capacitance falling within a certain range, and (iv) a negative electrode plate having a capacitance falling within a certain range, the polyvinylidene fluoride-based resin containing an ?-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol %.