Negative electrode and lithium ion secondary battery using...

Details Negative electrode and lithium ion secondary battery using... Negative electrode and lithium ion secondary battery using...

2006-12-05

2006-12-05

Weiner, Laura (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S231400, C429S231100, C429S231300, C429S231600, C252S502000, C252S182100

Reexamination Certificate

active

07144659

ABSTRACT:
A negative electrode for a lithium ion secondary battery comprising a material mixture layer comprising a carbonaceous material comprising a spherical natural graphite and a graphitized carbon fiber, wherein the material mixture layer has a carbon density of not less than 1.6 g/cm3; the spherical natural graphite has: (1) an interplanar spacing d002between the (002) planes determined by an X-ray diffraction pattern of 0.3354 to 0.3357 nm, (2) a mean particle circularity of not less than 0.86, and (3) a mean particle size of 5 to 20 μm; the graphitized carbon fiber has: (1) a mean fiber length of 20 to 200 μm, and (2) a mean aspect ratio of 2 to 10; and the amount of the graphitized carbon fiber is 50 to 90% by weight of whole of the carbonaceous material.

REFERENCES:
patent: 6805996 (2004-10-01), Hosoya
patent: 2002/0037458 (2002-03-01), Hosoya
patent: 1324120 (2001-11-01), None
patent: 11-263612 (1999-09-01), None
patent: 2000-195518 (2000-07-01), None
patent: 2000-294283 (2000-10-01), None

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