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:
Dec. 01, 2009
Filed:
Apr. 19, 2006
BO Hyun Kim, Seoul, KR;
Kwangho Yoo, Daejeon, KR;
Hyunwoo Park, Daejeon, KR;
Hey Woong Park, Daejeon, KR;
Jisang Yu, Daejeon, KR;
Bo Hyun Kim, Seoul, KR;
Kwangho Yoo, Daejeon, KR;
Hyunwoo Park, Daejeon, KR;
Hey Woong Park, Daejeon, KR;
Jisang Yu, Daejeon, KR;
LG Chem, Ltd., , KR;
Abstract
Disclosed is a lithium secondary battery comprising an electrode assembly composed of a cathode, an anode and a separator, and a lithium electrolyte, wherein the electrodes and/or electrolyte include a compound ('urethane compound') and/or polymer ('poly urethane') which are decomposed upon overcharge of the battery and contain a urethane group in a molecular structure thereof. The lithium secondary battery of the present invention is characterized by addition of a compound or polymer having a urethane group to electrodes and/or electrolyte, wherein the thus-added compound and/or polymer have substantially no adverse effects on general performance of the battery under normal operating conditions and are decomposed with high reliability upon overcharge of the battery, thereby offering time delay effects for securing battery safety, and the decomposition products thereof result in sharply increased internal resistance of the battery, thereby increasing battery safety.