Cathode active material for metal of CFX battery

• US 4,737,423 A
• Filed: 11/20/1986
• Issued: 04/12/1988
• Est. Priority Date: 12/30/1985
• Status: Expired due to Fees

• Current Assignee: Alliedsignal Inc. (Honeywell International Inc.)
• Original Assignee: Allied Corp. (Honeywell International Inc.)
• Inventors: Tung, Hsueh S.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/932,984
• Time in Patent Office: 509 Days
• Field of Search: 429/218, 429/194
• US Class Current: 429/231.7
• CPC Class Codes: C01B 32/10 Carbon fluorides, e.g. [CF]nor [C2F]n graphite intercalation thereof C01B32/22
• CPC Class Codes: H01M 4/583 Carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/5835 Comprising fluorine or fluoride salts
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

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/CF_x 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.

Claims

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.

2. The battery of claim 1 in which the fluorinated carbon is produced from heat treated carbon having a lattice constant (d₀₀₂) of 3.37Å

or greater.

3. The battery of claim 2 in which the metal anode is lithium.

4. The battery of claim 1 in which the fluorinated carbon is produced at a temperature of at least 480°

C.

5. The battery of claim 1 in which the fluorinated carbon is produced at a temperature of at least 540°

C.

6. The battery of claim 4 or 5 wherein the fluorinated carbon is produced from heat treated carbon having a lattice constant of (d₀₀₂) of 3.37Å

or greater.

7. The battery of claim 6 wherein the fluorinated carbon has been washed with an alkanol containing 1-3 carbon atoms.

8. The battery of claim 1 in which the metal anode is lithium.

9. The battery of claim 1 wherein 40% to 97% by weight of another and different fluorinated carbon made from carbon having a lattice constant between 3.40 and 3.50Å

is combined with the said fluorinated carbon.

10. The battery of claim 1 wherein the alkanol contains 1-3 carbon atoms.

11. The battery of claim 10 wherein the alkanol wash contains a reducing agent.

12. The battery of claim 11 wherein the reducing agent is a metal iodide.

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.

14. The battery of claim 13 in which the fluorinated carbon is further characterized by being produced by fluorinating carbon or heat treated carbon having a lattice constant (d₀₀₂) of 3.37Å

or greater.

15. The battery of claim 14 in which the fluorinated carbon is produced from heat treated carbon having a lattice constant (d₀₀₂) of 3.37Å

or greater.

16. The battery of claim 15 wherein the metal anode is lithium.

17. The battery of claim 16 in which the alkanol wash contains a reducing agent.

18. The battery of claim 17 in which the reducing agent is a metal iodide.