锂离子电池用外装材料

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A packaging material for lithium cell of the present invention includes a laminate of a substrate layer, a first adhesive layer, a metal foil layer, an anti-corrosion treatment layer of a single-layer or plural-layer structure, a second adhesive layer and a sealant layer stacked in this order. The anti-corrosion treatment layer is provided on the side of the second adhesive layer and contains a rare earth element oxide, 1 to 100 parts by mass of phosphoric acid or a phosphate salt per 100 parts by mass of the rare earth element oxide, and at least one polymer selected from the group of a cationic polymer and an anionic polymer wherein the at least one polymer is contained at least in the layer contacting with the second adhesive layer and the second adhesive layer contains a compound reactive with the at least one polymer contained in the layer contacting with the second adhesive layer.