Aluminum pouch film for secondary battery, and method for manufacturing same
An aluminum pouch film for a secondary battery and a method for manufacturing the aluminum pouch film are disclosed. The aluminum pouch film contains an aluminum layer; an outer resin layer formed on the first surface of the aluminum layer; a first adhesive layer for bonding the aluminum layer and the outer resin layer; an inner resin layer formed on the second surface of the aluminum layer; and a second adhesive layer for bonding the aluminum layer and the inner resin layer. The inner resin layer includes a compound formed by chemically bonding a fluoropolymer resin, a polyolefin, and a functional resin.
1 . An aluminum pouch film for a secondary battery, comprising:
an aluminum layer;
an outer resin layer formed on the first surface of the aluminum layer;
a first adhesive layer for bonding the aluminum layer and the outer resin layer;
an inner resin layer formed on the second surface of the aluminum layer; and
a second adhesive layer for bonding the aluminum layer and the inner resin layer,
wherein the inner resin layer comprises a compound formed by chemically bonding a fluoropolymer resin, a polyolefin, and a functional resin, wherein the inner resin layer comprises a compound formed by chemically bonding 3 to 18% by weight of fluoropolymer resin; 70 to 95% by weight of polyolefin; and 1 to 15% by weight of functional resin, based on the total weight of the inner resin layer, wherein the functional resin is a maleic anhydride polypropylene (MAPP).
2 . The aluminum pouch film for a secondary battery according to claim 1 , wherein the fluoropolymer resin comprises one selected from the group consisting of polyvinyl fluoride, polyvinylidene fluoride, polytrifluoroethylene, polytetrafluoroethylene, and combinations thereof.
3 . The aluminum pouch film for a secondary battery according to claim 1 , wherein the polyolefin is a polyethylene (PE), a polypropylene (PP), or a copolymer thereof.
4 . A method for manufacturing an aluminum pouch film for a secondary battery according to claim 1 , comprising the steps of:
a) preparing an aluminum layer;
b) forming an outer resin layer on the first surface of the aluminum layer;
c) preparing an inner resin layer containing a compound formed by chemically bonding a fluoropolymer resin, a polyolefin, and a functional resin; and
d) bonding the inner resin layer to the second surface of the aluminum layer.