The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 2019
Filed:
Apr. 01, 2016
SK Innovation Co., Ltd., Seoul, KR;
Dong Jin Joo, Daejeon, KR;
Su Ji Lee, Daejeon, KR;
Kyu Young Cho, Daejeon, KR;
Yun Bong Kim, Daejeon, KR;
Jae Woong Kim, Daejeon, KR;
SK Innovation Co., Ltd., Seoul, KR;
Abstract
The present invention relates to a composite separation membrane for a lithium secondary battery having excellent lifetime and safety improvement effects, and a preparation method therefor and, more specifically, to a composite separation membrane for a lithium secondary battery, including: a porous base layer; a heat resistant layer formed on one surface or both surfaces of the porous base layer; and a fusion layer formed on the outermost layer. Inorganic particles in the heat resistant layer are connected and fixed by a binder polymer, and the fusion layer is prepared by comprising amorphous polymer particles having a glass transition temperature of 30 to 90° C. and a difference between a fusion temperature and the glass transition temperature of 60° C. or lower.