Nonaqueous electrolyte secondary cell and method for...

Details Nonaqueous electrolyte secondary cell and method for... Nonaqueous electrolyte secondary cell and method for...

2005-11-29

2008-10-21

Weiner, Laura S (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S231100, C429S231800, C429S231400, C429S223000, C429S224000, C429S326000, C429S329000, C429S330000, C429S332000, C429S342000

Reexamination Certificate

active

07438991

ABSTRACT:
The invention provides a non-aqueous electrolyte secondary cell that has high capacity and excels in cycle characteristics. The non-aqueous electrolyte secondary cell functions stably at a high potential of from 4.4 to 4.6 V with respect to lithium and inhibits the decomposition of the electrolytic solution at high potential. This is accomplished as follows. The non-aqueous electrolyte secondary cell has a positive electrode having a positive electrode active material; a negative electrode having a negative electrode active material; and a non-aqueous electrolyte having a non-aqueous solvent and electrolytic salt. The positive electrode active material has: lithium cobalt compound oxide having added therein at least zirconium and magnesium; and lithium-nickel-manganese compound oxide having a layered structure. The positive electrode active material has a potential of from 4.4 to 4.6 V with respect to lithium. The non-aqueous solvent contains diethyl carbonate of 10 vol. % or higher at 25° C.

REFERENCES:
patent: 5686138 (1997-11-01), Fujimoto et al.
patent: 2007/0196736 (2007-08-01), Takahashi et al.
patent: 2002-75448 (2002-03-01), None
patent: 2002-313419 (2002-10-01), None
patent: 2003-308842 (2003-10-01), None
patent: 2004-134366 (2004-04-01), None
patent: 2005-317499 (2005-11-01), None
patent: WO 2005/093880 (2005-10-01), None

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