CLADDING FOR LITHIUM ION CELL, LITHIUM ION CELL, AND METHOD FOR PRODUCING LITHIUM ION CELL

A packaging material (1) for a lithium ion battery includes: a base material layer (10) that is formed from a film obtained by biaxially stretching a multi-layered coextruded film including a first thermoplastic resin layer (11) having rigidity and chemical resistance and being disposed at an outer side thereof, a second thermoplastic resin layer (12) having a capability of propagating stress and adhesiveness, and a third thermoplastic resin layer (13) having toughness; a metal foil layer (15) that is laminated on one surface of the base material layer (10); an anti-corrosion-treated layer (16) that is laminated on the metal foil layer (15); an inner adhesive layer (17) that is laminated on the anti-corrosion-treated layer (16); and a sealant layer (18) that is laminated on the inner adhesive layer (17).