Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Patent
1998-09-10
2000-10-31
Nuzzolillo, Maria
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
4292314, 423445R, 423448, 423460, 423461, H01M 458, C01B 3104, C09C 156
Patent
active
061399906
ABSTRACT:
There are provided modified and rounded graphite particles derived from scaly natural graphite particles by modification so as to bring their form close to a spherical form and satisfying all the following requirements (a) to (c): (a) that the degree of circularity should be not less than 0.86; (b) that, upon microscopic observation, the broken-out section should show a cabbage-like appearance with graphite slices taking various directions; and (c) that, upon X ray diffraction, the peak intensity ratio (Ih.sub.110 /Ih.sub.002) between the 002 face (parallel to graphite layers) and 110 face (perpendicular to graphite layers), which serves as an index of the randomness of orientation, should be not less than 0.0050. They retain good qualities of the raw material scaly natural graphite particles and are additionally unique in structure and characteristics. A method of producing such modified particles is also provided. Further provided are secondary cells or batteries in which the modified particles showing good slurry characteristics are used as an electrode material and with which the decrease in discharge capacity is small even at high discharge current values.
REFERENCES:
patent: 5426006 (1995-06-01), Delnick et al.
patent: 5612155 (1997-03-01), Takami et al.
patent: 5951959 (1999-09-01), Nishimura
B.D. Cullity, Elements of X-Ray Diffraction, 2nd Ed., pp. 401-402, 1978.
Koyanagi Hirokazu
Kubota Satoshi
Saito Syun
Tenno Kojiro
Kansai Netsukagaku Kabushiki Kaisha
Martin Angela J.
Nuzzolillo Maria
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