Secondary-battery porous membrane composition, secondary-battery porous membrane and secondary battery
A composition for a porous membrane of a secondary battery including a non-conductive particle and a water-soluble polymer, wherein the water-soluble polymer contains 80% by weight or more of a (meth)acrylamide monomer unit, and the water-soluble polymer has a storage modulus at 150° C. of 2.0×10 5 Pa or more; and a porous membrane manufactured therefrom and a secondary battery including the same.
1. A composition for a porous membrane of a secondary battery, comprising a non-conductive particle and a water-soluble polymer, wherein
the water-soluble polymer contains 80% by weight or more of a (meth)acrylamide monomer unit, and
the water-soluble polymer has a storage modulus at 150° C. of 2.0×10 5 Pa or more.
2. The composition for a porous membrane of a secondary battery according to claim 1 , wherein a glass transition temperature obtained by measuring dynamic viscoelasticity of the water-soluble polymer is 150 to 200° C.
3. The composition for a porous membrane of a secondary battery according to claim 1 , wherein the water-soluble polymer has a weight average molecular weight of 2.0×10 5 to 1.00×10 6 .
4. The composition for a porous membrane of a secondary battery according to claim 1 , wherein the water-soluble polymer contains an acid group-containing monomer unit.
5. A porous membrane for a secondary battery, obtained by forming a layer of the composition for a porous membrane of a secondary battery according to claim 1 , and drying the formed layer.
6. A secondary battery comprising the porous membrane for a secondary battery according to claim 5 .