| abstract |
A packaging material for an electrical storage device in which high adhesion between a barrier layer and an adhesive layer provided with a corrosion-resistant film is maintained even when moisture enters the interior of the electrical storage device. At least, a base material layer, a barrier layer, an adhesive layer, and a laminate comprising a heat-sealable resin layer in this order, wherein the adhesive layer is a resin composition containing a compound having an isocyanate group. cargo, and at least on the surface of the adhesive layer side of the barrier layer, a corrosion-resistant film is provided, and the corrosion-resistant film is analyzed using time-of-flight secondary ion mass spectrometry, CrPO 4 - The ratio P PO3/CrPO4 of the peak intensity P PO3 derived from PO 3 − to the peak intensity P CrPO 4 derived from PO 3 − is in the range of 6 to 120, and 287 eV by X-ray photoelectron spectroscopy of the corrosion-resistant coating. A peak P OCO derived from C1s of an OC=O bond in the range of 290 eV and a peak P CC derived from C1s of a CC bond at 285 eV are detected, and the height of the peak P OCO is divided by the height of the peak PC CC The value P OCO/CC of the obtained peak height ratio exists in the range of 0.10 or more and 0.50 or less, The packaging material for electrical storage devices. |