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. 29, 2004
Filed:
Jul. 27, 2001
Haruhisa Yamamoto, Tokyo, JP;
Akira Nakayama, Kawasaki, JP;
Zeon Corporation, Tokyo, JP;
Abstract
A binder composition used for making an electrode for a lithium-ion secondary battery, which comprises polymer particles dispersed in an organic medium having a boiling point of 80-350° C. at normal pressure. The polymer (1) comprises structural units derived from a monoethylenically unsaturated carboxylic acid ester monomer, and at least one kind of structural units selected from (b) structural units derived from a monoethylenically unsaturated carboxylic acid monomer and (c) structural units derived from a conjugated diene monomer; (2) has a ratio of (a)/[(b)+(c)] of 99/1−60/40 by weight; (3) has a total content of (a), (b) plus (c) of at least 80 wt. % based on the total structural units; and (4) is substantially free from structural units of a monoethylenically aromatic hydrocarbon monomer. A lithium-ion secondary battery having an electrode made with the binder exhibits a large service capacity and enhanced charge-discharge characteristics at a high temperature.