Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
2006-04-19
2009-12-01
Michener, Jennifer K (Department: 1795)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C429S062000, C429S215000
Reexamination Certificate
active
07625669
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.
REFERENCES:
patent: 3501326 (1970-03-01), Hochberg et. al.
patent: 4985036 (1991-01-01), Lommen et al.
patent: 5534365 (1996-07-01), Gee et al.
patent: 5759714 (1998-06-01), Matsufuji et al.
patent: 2004/0234865 (2004-11-01), Sato et al.
Kim Bo Hyun
Park Hey Woong
Park Hyun-woo
Yoo Kwangho
Yu Jisang
Cantor & Colburn LLP
LG Chem Ltd.
Michener Jennifer K
Rademaker Claire L
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