abstract |
And a heat resistant layer disposed on at least one side of the porous substrate, wherein the heat resistant layer includes an acrylic copolymer, an alkali metal, and a filler, wherein the acrylic copolymer is a (meth) acrylate or a (meth) acrylic acid A cyano group-containing unit, and a sulfonate group-containing unit, and a lithium secondary battery comprising the same. |