Packing material for lithium cell and production method thereof

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, whereinnthe 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, anda relationship between a mass (a) per unit surface area (g/m2) of the layer (A), and a mass (x) per unit surface area (g/m2) of the layer (X) satisfies an expression 2≧x/a≧0.01.

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, whereinnthe coating layer comprises a layer (M) containing a rare earth element-based oxide, a phosphoric acid or a phosphate, an anionic polymer, and a cross-linking agent that causes cross-linking of the anionic polymers, in which1 to 100 parts by mass of the phosphoric acid or the phosphate has been blended into 100 parts by mass of the rare earth element-based oxide, andthe coating layer (M) composition has a relationship that satisfies an expression 2≧x′/a′≧0.01 between a total mass (a′) (g) of the rare earth element-based oxide and the phosphoric acid or the phosphate, and a total mass (x′) (g) of the anionic polymer and the cross-linking agent that causes cross-linking of the anionic polymers.

A production method for a packing material for a lithium cell, comprising sequentially laminating a first adhesive layer, an aluminum foil layer, a coating layer, an adhesive resin layer or a second adhesive layer, and a sealant layer on one surface of a base material layer, whereinnthe coating layer is laminated on top of the aluminum foil layer bynapplying a coating composition (A), which comprises a rare earth element-based oxide and 1 to 100 parts by mass of a phosphoric acid or a phosphate per 100 parts by mass of the rare earth element-based oxide, onto the aluminum foil layer and subsequently drying the coating composition (A) to form a layer (A); andapplying a coating composition (X), which comprises an anionic polymer and a cross-linking agent that causes cross-linking of the anionic polymers, onto the layer (A) and subsequently drying the coating composition (X) to form a layer (X),wherein a relationship between a mass (a) per unit surface area (g/m2) of the layer (A), and a mass (x) per unit surface area (g/m2) of the layer (X) satisfies an expression 2>x/a≧0.01.

A production method for a packing material for a lithium cell, comprising sequentially laminating a first adhesive layer, an aluminum foil layer, a coating layer, an adhesive resin layer or a second adhesive layer, and a sealant layer on one surface of a base material layer, whereinnthe coating layer is laminated on top of the aluminum foil layer by applying a coating composition (M), which comprises a rare earth element-based oxide, 1 to 100 parts by mass of a phosphoric acid or a phosphate per 100 parts by mass of the rare earth element-based oxide, an anionic polymer, and a cross-linking agent that causes cross-linking of the anionic polymers, onto the aluminum foil layer and subsequently drying the coating composition (M) to form a layer (M), andthe coating composition (M) has a relationship that satisfies an expression 2≧x′/a′≧0.01 between a total mass (a′) (g) of the rare earth element-based oxide and the phosphoric acid or the phosphate, and a total mass (x′) (g) of the anionic polymer and the cross-linking agent that causes cross-linking of the anionic polymers.