Patent ID: 8110304

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) and a layer (B), the layer (A) comprises 1 to 100 parts by mass of a phosphoric acid or a phosphate having been blended into 100 parts by mass of a rare earth element-based oxide, the layer (A) is formed using a rare earth element-based oxide sol in which the rare earth element-based oxide has been stably dispersed using the phosphoric acid or the phosphate, and the layer (B) contains a cationic polymer and a cross-linking agent that causes cross-linking of the cationic polymers.