The surface arms of the projection image of the aspect of the filler ratio of 1.4 to the range of 4.0, a random diffraction plane one, perpendicular to each other measured by wide-angle X-ray diffraction method (hkl), the peak intensity of the _(abc): I _{(hkl ),} I _(abc) has the following formula (1) to meet and formula (2) to calculate that peak intensity ratio of the maximum value in the range of 1.5 to 300 in the range of non-aqueous electrolyte secondary battery, an insulating porous layer, the discharge output this property is excellent.
_{I (hkl)> I (abc} ) ... (One)
_{I (hkl) / I (abc} ) ... (2)