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:
Jan. 25, 2011
Filed:
May. 12, 2005
Shuji Tsutsumi, Ikoma, JP;
Kozo Watanabe, Katano, JP;
Mitsuhiro Takeno, Settsu, JP;
Mikinari Shimada, Yawata, JP;
Shuji Tsutsumi, Ikoma, JP;
Kozo Watanabe, Katano, JP;
Mitsuhiro Takeno, Settsu, JP;
Mikinari Shimada, Yawata, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A lithium ion secondary battery with improved safety against both internal short-circuiting and overcharge is provided. This lithium ion secondary battery includes a positive electrode comprising a composite lithium oxide, a negative electrode, and a non-aqueous electrolyte. At least one of the positive electrode and the negative electrode has a porous film, comprising an inorganic oxide filler and a binder, on the surface facing the other electrode, and the electrode surface having the porous film partially has a protruded part. This protruded part may be a protruded part formed on the porous film itself or a protruded part formed on an electrode mixture layer. Further, a separator can also be incorporated therein. Instead of the above-mentioned porous film, the separator can be provided with a porous film.