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. 20, 2010
Filed:
Apr. 26, 2007
Tsumoru Ohata, Kyoto, JP;
Junji Nakajima, Osaka, JP;
Tetsuya Hayashi, Kadoma, JP;
Takashi Takano, Hakodate, JP;
Shigeo Ikuta, Kawanabe, JP;
Kohei Suzuki, Yao, JP;
Kouji Nishida, Hirakata, JP;
Masao Fukunaga, Sakai, JP;
Akiko Fujino, Suita, JP;
Tsumoru Ohata, Kyoto, JP;
Junji Nakajima, Osaka, JP;
Tetsuya Hayashi, Kadoma, JP;
Takashi Takano, Hakodate, JP;
Shigeo Ikuta, Kawanabe, JP;
Kohei Suzuki, Yao, JP;
Kouji Nishida, Hirakata, JP;
Masao Fukunaga, Sakai, JP;
Akiko Fujino, Suita, 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 one of the positive electrode and the negative electrode; the porous film including a filler and a resin binder; the resin binder content in the porous film being 1.5 to 8 parts by weight per 100 parts by weight of the filler; and the resin binder including an acrylonitrile unit, an acrylate unit, or a methacrylate unit.