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:
Jul. 16, 2013
Filed:
Sep. 11, 2008
Inhwa Jung, Chungcheongnam-do, KR;
Jang-weon Rhee, Daejeon, KR;
Gwigwon Kang, Daejeon, KR;
Youngkeun Lee, Seoul, KR;
Yongkyoung Kim, Daejeon, KR;
Inhwa Jung, Chungcheongnam-do, KR;
Jang-Weon Rhee, Daejeon, KR;
Gwigwon Kang, Daejeon, KR;
Youngkeun Lee, Seoul, KR;
Yongkyoung Kim, Daejeon, KR;
SK Innovation Co., Ltd., Seoul, KR;
Abstract
The present invention relates to a microporous polyethylene film for use as battery separator. The microporous polyethylene film according to the present invention is characterized by having a film thickness of 5-40 μm, a porosity of 35-55%, a permeability from 2.5×10to 10.0 10Darcy, a puncture strength of at least 0.10 N/μm at 90° C., a puncture angle of at least 30° at 90° C., and a permeability from 2.0 10to 8.0 10Darcy after shrinking freely at 120° C. for 1 hour. The microporous polyethylene film in accordance with the present invention has very superior puncture strength and thermal stability at high temperature and takes place of less decrease of permeability due to low thermal shrinkage at high temperature, as well as superior permeability. Therefore, it can be usefully applied in a high-capacity, high-power battery to improve thermal stability and long-term stability of the battery.