Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Include electrolyte chemically specified and method
Patent
1996-01-02
1997-06-17
Kalafut, Stephen
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Include electrolyte chemically specified and method
H01M 614
Patent
active
056395752
ABSTRACT:
A non-aqueous liquid electrolyte secondary battery using a carbon material satisfying predetermined conditions of true density and parameters of crystalline structure as an anode material, a transition metal composite oxide having predetermined ion supply capability as a cathode material, and ethylene carbonate as a non-aqueous solvent, is disclosed. The carbon material has a true density of 2.2 g/cm.sup.3 and greater, an interplanar distance of (002) plane of between 0.375 and 0.338 nm, inclusive a C-axis crystallite size of the (002) plane of 20.0 nm and greater and a G value in Raman spectrum of 2.5 and greater. The transition metal composite oxide contains lithium of an amount equivalent to a charge/discharge capacity of 300 mAh and greater per unit weight of the carbon material. The carbon material forming the anode has a grain diameter of 1 .mu.m and greater. The non-aqueous solvent is a mixed solvent of ethylene carbonate and chain carbonic ester. As the chain carbonic ester, diethyl carbonate, dimethyl carbonate or methylethyl carbonate is employed.
REFERENCES:
patent: 5561005 (1996-10-01), Omaru et al.
Kitamura et al, Abstract For Japanese Koka:, 2-172162 Jul. 3, 1990.
Kuriyama, Kokai, 355770, Mar. 11, 1991.
Ofuku, Kokai, 2172163, Jul. 3, 1990.
Date Naoyuki
Nagamine Masayuki
Omaru Atsuo
Kalafut Stephen
Krueger Jonathan S.
Sony Corporation
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