METHOD OF INHIBITING VOLTAGE SUPPRESSION LITHIUM/FLUORINATED CARBON BATTERIES

Abstract

A means to eliminate the suppression of the closed circuit voltage of a Li/CFx battery during the initial part of its discharge is effected by blending an additive CFx which does not show significant voltage suppression with the (bulk) CFx 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/CFx 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 discharge, 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 CFx additive is depleted, the bulk CFx has discharged to the point that it no longer shows voltage suppression.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1GEORGE A. SHIA