Graphitic electrode material for secondary battery and process f

Details Graphitic electrode material for secondary battery and process f Graphitic electrode material for secondary battery and process f

1996-09-24

1998-02-24

Maples, John S.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

429194, 423448, H01M 458

Patent

active

057210713

ABSTRACT:
A graphitic electrode material suitable for use in a non-aqueous solvent-type secondary battery is provided. The graphitic material is characterized by an average (002)-plane spacing d.sub.002 of 0.336-0.345 nm, a crystallite size along c-axis L.sub.c(002) of 15-60 nm, and a lattice strain .epsilon. of at most 2.0.times.10.sup.-2 nm.sup.-1 as measured by X-ray diffraction method. The graphitic material may suitably be formed through a process including the steps of: thermally polymerizing a condensed polycyclic aromatic compound in the presence of a Lewis acid catalyst to form a polymerizate, and heat-treating the polymerizate at 2100.degree.-2600.degree. C. under a reduced pressure or in an inert gas atmosphere. The graphitic electrode material exhibits large doping and dedoping capacities which provide only a small difference therebetween (i.e., irreversible capacity) and cause only a small decrease at the time of quick charging and discharging.

REFERENCES:
patent: 5244757 (1993-09-01), Takami et al.
patent: 5350648 (1994-09-01), Kagawa et al.
patent: 5527643 (1996-06-01), Sonobe et al.
Database WPI, Section Ch, Week 9432, Derwent Publications Ltd., London, GB; Class A35, AN 94-258086, XP002021514 & JP-A-06 187 972 (Osaka Gas Co Ltd), Jul. 8, 1994 *abstract*.
Database WPI, Section Ch, Week 9401, Derwent Publications Ltd., London, GB; Class A85, AN 94-003097, XP002021515 & JP-A-05 314 975 (Mitsubishi Kasei Corp), Nov. 26, 1993 *abstract*.

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