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:
Nov. 01, 2011
Filed:
Nov. 21, 2008
Gwigwon Kang, Daejeon, KR;
Jang-weon Rhee, Daejeon, KR;
Inhwa Jung, Chungcheongnam-do, KR;
Youngkeun Lee, Seoul, KR;
Yongkyoung Kim, Daejeon, KR;
Gwigwon Kang, Daejeon, KR;
Jang-Weon Rhee, Daejeon, KR;
Inhwa Jung, Chungcheongnam-do, KR;
Youngkeun Lee, Seoul, KR;
Yongkyoung Kim, Daejeon, KR;
SK Innovation Co., Ltd., Seoul, KR;
Abstract
The present invention relates to a microporous polyolefin film suitable as a separator for batteries and thermal properties thereof. A microporous polyolefin film according to the present invention has a film thickness of 5-40 μm, a porosity of 30%-60%, a permeability of 2.0×10-8.0×10Darcy, a maximum pore size determined by the bubble point method of not more than 0.1 μm, a puncture strength of 0.20 N/μm or more at room temperature and 0.05 N/μm or more at 120° C., and a maximum shrinkage ratio in the transverse direction (TD) when subjected to a thickness-normalized external force in TMA (thermo-mechanical analysis) of not more than 0%. With excellent thermal stability at high temperature as well as superior puncture strength and gas permeability, the microporous polyolefin film according to the present invention is suitable for high-capacity, and high-power batteries.