| abstract |
According to the present invention, there is provided a lithium ion battery exterior material which has excellent electrolyte solution resistance, excellent deep drawing moldability, and can be easily manufactured even without chromate treatment. The lithium ion battery exterior material 1 which is the 1st aspect of this invention is a base material layer 11, the 1st contact bonding layer 12 containing an adhesive agent, the aluminum foil layer 13, the anti-corrosion treatment layer 14, an adhesive agent, or adhesiveness The second adhesive layer 15 containing the resin and the sealant layer 16 are sequentially stacked, and the base layer 11 extends to the yield point measured in accordance with JIS-K7127 in at least one of the MD direction or the TD direction. It has a film base material A which is 100% or more of the difference (alpha)-(alpha) 1 between the figure (alpha) 1 and the elongation (alpha) 2 to a breaking point. |