| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging material for a lithium ion battery having excellent cold formability, causing no whitening even if electrolyte solution sticks to the surface in a packaging process and causing no delamination between a metallic foil and a sealant layer even if the battery has been stored for a long period after packaging. SOLUTION: In this packaging material, a basic material layer is composed of polyester films, in both longitudinal and lateral directions, having tensile fracture growth of≥200%, tensile fracture strength of≥200 Mpa and Young's modulus of≤3.2 Gpa, a metallic film is a soft aluminum alloy foil containing iron by 0.7 to 1.7% and having an aluminum purity of≥97.9% and with a boehmite treatment applied on at least an anchor coat layer side, the anchor coat layer is made of an isocyanate compound, and an adhesive resin layer is made of mixed resin of metallocene based straight chain polyethylene resin of 70 to 90 wt% with a density of≥0.92 g/cm<SP>3</SP>and low-density polyethylene resin of 30 to 10 wt%. COPYRIGHT: (C)2005,JPO&NCIPI |
