NOVELTY - A lithium ion battery cladding material (1) consists of a laminated component comprising a base material protective layer (18) containing water-soluble polysaccharide, contact bonding layer (17), a base material layer (11) containing nylon films, contact bonding layer (12), metal foil layer (13), corrosion-prevention process layer (14), contact bonding layer (15) and a sealant layer (16), laminated sequentially. The water-soluble polysaccharide dissolves 1 part mass polysaccharide in 100 parts mass solvent chosen from alcohol aqueous solution and water, at 85 degrees C.    USE - Cladding material is used for lithium ion battery. Uses include but are not limited to personal computer, mobile phone, video camera, satellite, submarine, electric vehicle and electric-power-assisted bicycle.    ADVANTAGE - The lithium ion battery cladding material has excellent adhesiveness with respect to base material layer, favorable moldability and electrolyte solution tolerance. The base material protective layer of lithium ion battery cladding material has excellent abrasion resistance, tensile strength and suppressed deterioration of base material layer with electrolyte solution. The corrosion-prevention process layer suppresses the corrosion and delamination inside metal foil.    DETAILED DESCRIPTION - A lithium ion battery cladding material consists of a laminated component comprising a base material protective layer containing water-soluble polysaccharide, contact bonding layer, base material layer containing nylon films, contact bonding layer, metal foil layer, corrosion-prevention process layer, contact bonding layer and a sealant layer, laminated sequentially. The water-soluble polysaccharide dissolves 1 part mass polysaccharide in 100 parts mass solvent chosen from alcohol aqueous solution containing 50 %mass or more methanol, ethanol or propanol/isopropyl alcohol, and water, at 85 degrees C. The polymerization degree of water-soluble polysaccharide on opposite side (11b) of base material layer is higher than the polymerization degree of water-soluble polysaccharide on surface (11a) of base material layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the lithium ion battery cladding material.    Lithium ion battery cladding material (1)    Base material layer (11)    Surface of base material layer (11a)    Opposite side of base material layer (11b)    Contact bonding layers (12, 15, 17)    Metal foil layer (13)    Corrosion-prevention process layer (14)    Sealant layer (16)    Base material protective layer (18)