SECONDARY CELL POSITIVE ELECTRODE, MANUFACTURING METHOD THEREOF, AND SECONDARY CELL

Title:

SECONDARY CELL POSITIVE ELECTRODE, MANUFACTURING METHOD THEREOF, AND SECONDARY CELL

Document Type and Number:

WIPO Patent Application WO/2006/082708

Kind Code:

A1

Abstract:

It is possible to provide a secondary cell positive electrode having a small electric resistance and a large mechanical strength and a secondary cell capable of performing charge/discharge using a large current and having a large capacity and an excellent storage characteristic. The secondary cell positive electrode has an active material layer containing at least a radical compound and carbon fiber having an average value of inter-layer distance d₀₀₂ of the graphite structure in a range from 0.335 nm to 0.340 nm. The carbon fiber having such an inter-layer distance has a tensile modulus in a range from 200 GPa to 800 GPa and preferably has a volume resistivity in a range from 200 μ&ohm •cm to 2000 μ&ohm •cm. The carbon fiber is preferably a vapor-epitaxial carbon fiber or a carbon fiber formed by meso-phase pitch as a precursor which has been graphitized.

Inventors:

IRIYAMA JIRO (JP)
NAKAHARA KENTARO (JP)
IWASA SHIGEYUKI (JP)
SUGURO MASAHIRO (JP)
SATOH MASAHARU (JP)

Application Number:

PCT/JP2006/300695

Publication Date:

August 10, 2006

Filing Date:

January 19, 2006

Export Citation:

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Assignee:

NEC CORP (JP)
IRIYAMA JIRO (JP)
NAKAHARA KENTARO (JP)
IWASA SHIGEYUKI (JP)
SUGURO MASAHIRO (JP)
SATOH MASAHARU (JP)

International Classes:

H01M4/133; H01M4/137; H01M4/1399; H01M4/587; H01M4/60; H01M4/62

Foreign References:

JP2002304996A	2002-10-18
JP2004003097A	2004-01-08
JPH11176446A	1999-07-02
JP2002083601A	2002-03-22
JP2003282147A	2003-10-03