| abstract |
The present invention relates to a high heat resistant polyolefin-based separator comprising a coating layer containing a polyamic acid. Specifically, the present invention is a separator comprising a polyolefin-based film and a coating layer containing polyamic acid on one or both surfaces of the polyolefin-based film, wherein the polyamic acid is a sulfone group, a trifluoromethyl group, an alkyl group, and a phenyl ether group. It relates to a separator comprising at least one functional group selected from the group consisting of. The present invention also relates to an electrochemical cell having improved thermal stability using a separator including the polyamic acid-containing coating layer. |