Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
2005-04-11
2008-11-18
Crepeau, Jonathan (Department: 1795)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
Reexamination Certificate
active
07452633
ABSTRACT:
A non-aqueous electrolyte secondary battery in which a positive electrode formed of a graphite powder and an negative electrode formed of a material capable of absorption/desorption of a lithium metal or lithium are placed to face each other in an electrolyte containing lithium salt. The positive electrode of this battery where a Lc (112) which is the size of crystallite in a c axis direction which is calculated from a (112) diffraction line of a graphite crystal and determined by a powder X-ray diffraction method which is from 4 nm to 30 nm, and a charge capacity at the first cycle which is calculated on the basis of a total weight of the graphite material of the positive electrode filled in the battery is 20 to 50 (mAh/g). Preferably, the graphite powder of the positive electrode has an ratio (A/B) which is the ratio of a specific surface area A determined by a nitrogen absorption (BET) method to a surface area B determined on the basis of an area average diameter of 20 or less.
REFERENCES:
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Takashi Suzuki et al., “Hosoka Kokuen Zairyo no Seikyoku Tokusei to Denchi Tokusei”, Dai 43 Kai Battery Symposium in Japan, Oct. 12, 2002, 2A10, pp. 170-171.
Inagaki Minoru
Miwa Toshiyuki
Nabekura Kenji
Nakanishi Masanori
Sagisaka Hiroto
Crepeau Jonathan
FDK Corporation
Harness Dickey & Pierce PLC
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