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, 2007
Filed:
Sep. 28, 2001
Tsutomu Sada, Otsu, JP;
Kazunari Takeda, Tsurugashima, JP;
Yumiko Takashima, Tano-gun, JP;
Naoto Nishimura, Kashihara, JP;
Takehito Mitate, Yamatotakada, JP;
Kazuo Yamada, Kitakatsuragi-gun, JP;
Motoaki Nishijima, Gose, JP;
Naoto Torata, Kashihara, JP;
Tsutomu Sada, Otsu, JP;
Kazunari Takeda, Tsurugashima, JP;
Yumiko Takashima, Tano-gun, JP;
Naoto Nishimura, Kashihara, JP;
Takehito Mitate, Yamatotakada, JP;
Kazuo Yamada, Kitakatsuragi-gun, JP;
Motoaki Nishijima, Gose, JP;
Naoto Torata, Kashihara, JP;
Dai-Ichi Kogyo Seiyaku Co., Ltd., Kyoto, JP;
Sharp Corporation, Osaka, JP;
Abstract
A lithium secondary battery which comprises a negative electrode, a positive electrode, and disposed therebetween a polymer electrolyte comprising an ionically conductive polymer. The polymer electrolyte has a two-layer structure composed of a positive-electrode-side layer and a negative-electrode-side layer. The polymer electrolyte on the positive-electrode side contains a nonaqueous electrolytic solution containing a lithium salt in a higher concentration than that in the polymer electrolyte on the negative-electrode side. The battery is improved in charge/discharge cycling characteristics and high-load discharge characteristics.