| abstract |
The present invention provides a secondary battery comprising a separator material, and having superior high temperature cycle characteristics and a higher energy density, and a method of manufacturing a secondary battery. A separator is evaluated and selected by thermal decomposition gas chromatography (thermal decomposition +GC/MS). In an ideal separator, the value of (the area of Peak 1 exhibiting 1-Decene)/(the area of Peak 2 exhibiting 1-Octene) in a total ion chromatogram (TIC) of the pyrolysate of the separator is 2.05 or less. More preferably, a material is selected, in which the value of (the area of Peak 1)/(the area of Peak 2) is 2.00 or less, and the value of (the area of Peak 1)/(the area of Peak 3 exhibiting 1-Nonene) is 1.87 or less. Also, the value of (the area of Peak 3)/(the area of Peak 2) is 1.05 or less for a separator. |