| abstract |
The present invention provides a battery packaging material excellent in long-term adhesion of a barrier layer having an acid-resistant coating. The battery packaging material of the present invention is composed of a laminate having at least a base layer, a barrier layer, and a heat-fusible resin layer in this order, and has an acid-resistant coating on at least one surface of the barrier layer, and the acid-resistant coating is: When analyzed by time-of-flight secondary ion mass spectrometry, the ratio P PO3/CrPO4 of the peak intensity P PO3 derived from PO 3 − to the peak intensity P CrPO 4 derived from CrPO 4 − was in the range of 6 to 120. |