Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Include electrolyte chemically specified and method
Patent
1995-05-15
1997-01-07
Skapars, Anthony
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Include electrolyte chemically specified and method
429197, 429218, H01M 448, H01M 616
Patent
active
055915434
ABSTRACT:
The invention relates to novel cathodes for secondarylithium cells and to lithium cells which contain such cathodes. The secondary cells can be charged and discharged substantially more times than corresponding cells which contain conventional LiCoO.sub.2 type cathodes.
The cathodes are based on crystalline compounds of the Li.sub.1 x M.sub.x/2 CoO.sub.2 type. One of the aspects of the invention is a process for the production of such crystalline cathodes, where M is selected from calcium, strontium, barium and magnesium and where the content of such bivalent cation M in the crystal is from about 0.1 weight-% to about 10 weight-%, preferably 0.2 to 5 weight-%. The novel crystalline cathode compound is synthesized by a solid/solid reaction at elevated temperature, generally in the 700.degree. C. to about 900.degree. C. range. The cathode may be prepared from small crystals of such a compound, in combination with a compatible binder or conductive material, such as graphite.
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patent: 4465747 (1984-08-01), Evans
patent: 4770960 (1988-09-01), Nagaura et al.
patent: 5028500 (1991-07-01), Fong et al.
patent: 5168019 (1992-12-01), Sugeno
Gorenshtein Aharon
Menachem Chen
Peled Emanuel
Ramot University Authority for Applied Research and Industrial
Schindler Edwin D.
Skapars Anthony
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