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. 03, 2012
Filed:
Sep. 13, 2004
Kohei Suzuki, Yao, JP;
Tsumoru Ohata, Kyoto, JP;
Junji Nakajima, Osaka, JP;
Akiko Fujino, Suita, JP;
Shigeo Ikuta, Kawanabe-gun, JP;
Tetsuya Hayashi, Kadoma, JP;
Yusuke Fukumoto, Moriguchi, JP;
Shinji Kasamatsu, Katano, JP;
Kohei Suzuki, Yao, JP;
Tsumoru Ohata, Kyoto, JP;
Junji Nakajima, Osaka, JP;
Akiko Fujino, Suita, JP;
Shigeo Ikuta, Kawanabe-gun, JP;
Tetsuya Hayashi, Kadoma, JP;
Yusuke Fukumoto, Moriguchi, JP;
Shinji Kasamatsu, Katano, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A lithium ion secondary battery includes a positive electrode capable of absorbing and desorbing lithium ion, a negative electrode capable of absorbing and desorbing lithium ion, a porous film interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte, the porous film being adhered to a surface of at least the negative electrode. The porous film includes an inorganic filler and a first binder: The content of the first binder in the porous film is 1.5 to 8 parts by weight per 100 parts by weight of the filler: The first binder includes a first rubber including an acrylonitrile unit: The first rubber is water-insoluble and has a decomposition temperature of 250° C. or higher. The negative electrode includes a negative electrode active material capable of absorbing and desorbing lithium ion and a second binder, and the second binder includes a second rubber particle and a water-soluble polymer.