Cathode active material for metal of CFX battery
First Claim
1. In a battery having a non-aqueous electrolyte, a fluorinated carbon cathode and a metal anode selected from the group consisting of lithium, sodium, potassium and zinc, the improvement comprising utilizing a fluorinated carbon in which the fluorinated carbon has been produced by fluorinating carbon or heat treated carbon having a lattice constant (d002) of 3.37Å
- or greater at a temperature of at least 460°
C. and washing with an alkanol.
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Accused Products
Abstract
Improved fluorinated carbon made from an amorphous carbon or heat treated amorphous carbon having a lattice constant (d002) of 3.37A or greater for use as a positive electrode of a battery is provided. Such improved fluorinated carbon has low free oxidizing power, high utility factor and high capacity upon discharge in a Li/CFx battery. The free oxidizing power is found to be dependent on reaction temperature; the higher the fluorination temperature the lower the free oxidizing power. Low free oxidizing power is obtained at reaction temperatures of at least 460° C. Residual free oxidizing power can be further reduced by washing with an alkanol. Such alkanol wash can also be used to reduce free oxidizing power in fluorinated carbons prepared at lower temperatures.
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Citations
18 Claims
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1. In a battery having a non-aqueous electrolyte, a fluorinated carbon cathode and a metal anode selected from the group consisting of lithium, sodium, potassium and zinc, the improvement comprising utilizing a fluorinated carbon in which the fluorinated carbon has been produced by fluorinating carbon or heat treated carbon having a lattice constant (d002) of 3.37Å
- or greater at a temperature of at least 460°
C. and washing with an alkanol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- or greater at a temperature of at least 460°
- 13. In a battery having a non-aqueous electrolyte, a fluorinated carbon cathode and a metal anode selected from the group consisting of lithium, sodium, potassium and zinc, the improvement comprising utilizing a fluorinated carbon in which a fluorinated carbon possessing measurable free oxidizing power has been washed with an alkanol.
Specification