Alumina, a slurry containing the same, and an alumina porous film using the same, a laminated separator, a nonaqueous electrolyte secondary battery, and a method of manufacturing a nonaqueous electrolyte secondary battery

摘要

The present invention provides alumina excellent in electrolyte stability, 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 producing a nonaqueous electrolyte secondary battery. A first aspect of the present invention is a method for producing a semiconductor device, which comprises a total of 200 to 50,000 mass ppm of at least one element selected from the group consisting of K, Mg, Ca, Sr, Ba and La, The total amount of alumina is 0.5 to 20 at%. Further, in a second aspect of the present invention, there is provided an infrared absorption spectrum obtained by Fourier transform infrared spectroscopy, wherein a line segment connecting the intensities at 3400 cm ^-1 and 3500 cm ^-1 is used as a base line, large, and also is not more than 90cm ^-1 is a peak half width, provided the alumina is not in the range of 3400 to 3500cm ^-1.