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Title:
NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND CHARGE/DISCHARGE SYSTEM THEREOF
Document Type and Number:
WIPO Patent Application WO/2004/102701
Kind Code:
A1
Abstract:
A nonaqueous electrolyte secondary battery is disclosed which comprises a positive electrode composed of a positive electrode mix layer, a negative electrode composed of a negative electrode mix layer, a separator or a lithium ion-conductive porous film interposed between the positive electrode and the negative electrode, and a lithium ion-conductive nonaqueous electrolyte. The positive electrode mix layer contains a positive electrode active material composed of a lithium-transition metal composite oxide, and the lithium-transition metal composite oxide contains lithium, a transition metal and a metal other than the transition metal. The negative electrode mix layer contains a negative electrode active material composed of a carbon material. In the region where the positive electrode mix layer and the negative electrode mix layer face each other, the ratio (R: Wp/Wn) of the weight of the positive electrode active material (Wp) contained in the positive electrode mix layer per unit area to the weight of the negative electrode active material (Wn) contained in the negative electrode mix layer per unit area is 1.3-2.2. In the normal operation, the charging final voltage of this nonaqueous electrolyte secondary battery is set at 4.25-4.5 V.

Inventors:
WATANABE SHOICHIRO
NAGAYAMA MASATOSHI
KURANAKA SO
Application Number:
PCT/JP2004/006620
Publication Date:
November 25, 2004
Filing Date:
May 11, 2004
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
WATANABE SHOICHIRO
NAGAYAMA MASATOSHI
KURANAKA SO
International Classes:
H01M4/131; H01M4/36; H01M4/505; H01M4/525; H01M4/62; H01M10/05; H01M10/0525; H01M10/0566; H01M10/058; H01M10/42; H01M10/44; (IPC1-7): H01M4/02; H01M4/58; H01M10/40; H01M10/44
Domestic Patent References:
WO2003019713A12003-03-06
Foreign References:
JP2001351624A2001-12-21
JPH06310143A1994-11-04
JP2002042867A2002-02-08
JP2000348725A2000-12-15
JP2002203553A2002-07-19
JP2002319398A2002-10-31
JP2004207120A2004-07-22
JP2002203553A2002-07-19
JP2002319398A2002-10-31
JP2002203553A2002-07-19
Other References:
See also references of EP 1655793A4
Attorney, Agent or Firm:
Ishii, Kazuo (kitahama 2-chome Chuo-ku Osaka-sh, Osaka 41, JP)
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