NOVELTY - A lithium ion battery cladding material (1) comprises base material layer (11) containing nylon film, 1st contact bonding layer (12) provided on 1st surface (11a) of base material layer, metal foil layer (13) provided on side opposite to base material layer of 1st contact bonding layer, corrosion prevention process layer (14) provided on side opposite to 1st contact bonding layer of metal foil layer, 2nd contact bonding layer (15) provided on side opposite to metal foil layer of corrosion prevention process layer, and sealant layer (16).    USE - A lithium ion battery cladding material (claimed).    ADVANTAGE - The lithium ion battery cladding material exhibits sufficient moldability and electrolyte solution tolerance and outstanding abrasion resistance.    DETAILED DESCRIPTION - A lithium ion battery cladding material (1) comprises base material layer (11) containing nylon film, 1st contact bonding layer (12) provided on 1st surface (11a) of base material layer, metal foil layer (13) provided on side opposite to base material layer of 1st contact bonding layer, corrosion prevention process layer (14) provided on side opposite to 1st contact bonding layer of metal foil layer, 2nd contact bonding layer (15) provided on side opposite to metal foil layer of corrosion prevention process layer, sealant layer (16) provided on side opposite to corrosion prevention process layer of 2nd contact bonding layer, 3rd contact bonding layer (17) provided on 2nd surface (11b) of base material layer, and base material protective layer (18) provided on side opposite to base material layer of 3rd contact bonding layer. Base material protective layer contains water-soluble polysaccharide (A). Amount of component (A) dissolved in 100 mass parts of solvent e.g. aqueous alcohol solution containing 50 mass% methanol, ethanol, propanol, or isopropyl alcohol and water at 85 degrees C is greater than or equal to 1 mass part.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional diagram of the lithium ion battery cladding material.    Lithium ion battery cladding material (1)    Base material layer (11)    1st surface (11a)    2nd surface (11b)    1st contact bonding layer (12)    Metal foil layer (13)    Corrosion prevention process layer (14)    2nd contact bonding layer (15)    Sealant layer (16)    3rd contact bonding layer (17)    Base material protective layer (18)