Positive electrode for nonaqueous electrolyte secondary...

Details Positive electrode for nonaqueous electrolyte secondary... Positive electrode for nonaqueous electrolyte secondary...

2011-07-19

2011-07-19

Maples, John S (Department: 1728)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S224000, C429S231300

Reexamination Certificate

active

07981544

ABSTRACT:
A positive electrode for a nonaqueous electrolyte secondary battery using a positive electrode active material mixture according to an embodiment of the invention includes a positive electrode active material capable of intercalating and deintercalating a lithium ion, a conductive agent and a binder, in which the positive electrode active material is produced by coating cobalt-based lithium composite oxide represented by a general formula: LiaCo1-sM1sO2with lithium nickel cobalt manganese oxide represented by a general formula: LibNitCouMnvO2, the ratio r1/r2of the average particle diameter r1of the cobalt-based lithium composite oxide and the average particle diameter r2of the lithium nickel cobalt manganese oxide is 2≦r1/r2≦50, and the average particle diameter r2of the lithium nickel cobalt manganese oxide is 0.5 μm≦r2≦20 μm. By containing such a constitution, a positive electrode for a nonaqueous electrolyte secondary battery in which even when the charging discharging is repeated at a high potential of 4.5 V based on lithium, not only is the retention characteristics in a charged state excellent, but also the enhancing the capacity and the energy density of the battery can be achieved; and a production method thereof, can be provided.

REFERENCES:
patent: 2006/0115730 (2006-06-01), Taniguchi et al.
patent: 2006/0275667 (2006-12-01), Watanabe et al.
patent: 2007/0122338 (2007-05-01), Park et al.
patent: 9-306546 (1997-11-01), None
patent: 2004-127694 (2004-04-01), None
patent: 2005-317499 (2005-11-01), None

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