Fluorinated carbon composition for use in fabricating a Li/CF.su

Details Fluorinated carbon composition for use in fabricating a Li/CF.su Fluorinated carbon composition for use in fabricating a Li/CF.su

1987-06-08

1988-08-23

Skapars, Anthony

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

423448, 423489, 423496, 429213, C01B 3100, H01M 460

Patent

active

047659688

ABSTRACT:
A means to eliminate the suppression of the closed circuit voltage of a Li/CF.sub.x battery during the initial part of its discharge is effected by blending an additive CF.sub.x which does not show significant voltage suppression with the (bulk) CF.sub.x that is normally used in fabricating cathodes for such batteries. Blending is used to get a mixture which has substantially minimized voltage suppression and has good capacity.
The closed circuit voltage of a Li/CF.sub.x battery during the initial 10% of discharge is known to be lower than the closed circuit voltage during the later stages. This characteristic adversely impacts applications since the voltage at beginning of life is as low as the voltage indicating end of life, complicating design of circuitry to indicate end of life.
In the disclosure, the material with no significant voltage suppression discharges preferentially at the beginning of discharge leading to higher voltage and no suppression. The bulk material also discharges to some extent during this early stage of discharge. When the small percentage of coke-based CF.sub.x additive is depleted, the bulk CF.sub.x has discharged to the point that it no longer shows voltage suppression.

REFERENCES:
patent: 3700502 (1972-10-01), Watanabe et al.
patent: 4139474 (1979-02-01), Watanabe et al.
patent: 4438086 (1984-03-01), Aramaki et al.
patent: 4686161 (1987-08-01), Shia et al.

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