| abstract |
The present invention relates to a highly heat resistant polyolefin-based separation membrane comprising a coating layer, which contains a polyamnic acid. More specifically, the present invention relates to the separation membrane comprising: a polyolefin-based base material film; and the coating layer containing the polyamic acid which is provided on one or both surfaces of the polyolefin-based base material film, wherein the polyamic acid contains at least one type of a functional group selected from a group consisting of a sulfonyl group, a trifluoromethyl group, an alkyl group, and a phenyl ether group. Also, the present invention relates to an electrochemical battery of which thermal stability is improved by using the separation membrane comprising the coating layer, which contains the polyamic acid. |