Alumina, slurry containing the same, and porous alumina membrane, laminated separator, non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery using the same

摘要

To provide alumina having excellent electrolytic solution stability and a slurry containing the same, and an alumina porous film using the same, a laminated separator, a nonaqueous electrolyte secondary battery and a method for manufacturing the nonaqueous electrolyte secondary battery. The first aspect of the present invention provides alumina including one or more selected from the group consisting of K, Mg, Ca, Sr, Ba and La in the total amount of 200 to 50,000 ppm by mass, wherein a surface concentration of one or more elements is 0.5 to 20 at% in total. The second aspect of the present invention provides alumina, in which in an infrared absorption spectrum of the alumina obtained by Fourier-transform infrared spectroscopy, a peak having an intensity larger than that of a baseline defined by a line segment connecting an intensity at 3,400 cm -1 and an intensity at 3,500 cm -1 and having a half width of 90 cm -1 or less, does not exist in a range of 3,400 to 3,500 cm -1 .