Patent ID: 8071235

Claim:
A packing material for a lithium cell, comprising a first adhesive layer, an aluminum foil layer, a coating layer, an adhesive resin layer or a second adhesive layer, and a sealant layer laminated sequentially on one surface of a base material layer, wherein the coating layer is a multilayer structure comprising a layer (A), in which 1 to 100 parts by mass of a phosphoric acid or a phosphate has been blended into 100 parts by mass of a rare earth element-based oxide, and a layer (X) containing an anionic polymer and a cross-linking agent that causes cross-linking of the anionic polymers, and a relationship between a mass (a) per unit surface area (g/m 2 ) of the layer (A), and a mass (x) per unit surface area (g/m 2 ) of the layer (X) satisfies an expression 2â‰§x/aâ‰§0.01.