Silver vanadium oxide-fluoride material useful as a battery cathode
View Patent ↗Metal oxide-fluoride material including silver, vanadium, oxygen and fluorine, such as Ag 4 V 2 O 6 F 2 , is made and useful as a cathode for a battery. The material is made by subjecting silver oxide, vanadium oxide, and aqueous solution of HF to superambient temperature in a pressure vessel.
1. Metal oxide-fluoride material represented by Ag 4 V 2 O 6 F 2 .
2. The material of claim 1 which exhibits either increased capacity expressed as milliampere hour per gram of material at a potential of 3V as compared to that of silver vanadium oxide material or a higher open circuit potential than that of silver vanadium oxide material versus lithium, or both.
3. The material of claim 1 which crystallizes in a monoclinic space group.
4. A cathode comprising a metal oxide-fluoride material wherein the material is represented by Ag 4 V 2 O 6 F 2 .
5. A battery having an anode and a cathode wherein the cathode comprises a metal oxide-fluoride material wherein the material is represented by Ag 4 V 2 O 6 F 2 .
6. The battery of claim 5 wherein the cathode comprises a layer of said material.
7. The battery of claim 5 which is a medical defibrillator battery.
8. The battery of claim 5 having a lithium anode and having a maximum capacity of about 150 mAh/g and greater at a voltage of 3V.
9. A method of making a metal oxide-fluoride material, comprising subjecting silver oxide, vanadium oxide, and an aqueous solution of HF to superambient temperature in a pressure vessel.
10. The method of claim 9 wherein said silver oxide, said vanadium oxide, and said aqueous solution of HF are disposed in a container which is heated in the pressure vessel.
11. The method of claim 9 wherein amounts of Ag 2 O, V 2 O 5 , and aqueous solution of HF are subjected to said superambient temperature to form the metal oxide-fluoride material represented by Ag 4 V 2 O 6 F 2 .
12. The method of claim 9 wherein the superambient temperature is about 100 to about 150 degrees C.
13. A method of making a cathode, comprising depositing a layer that comprises a metal oxide-fluoride material represented by Ag 4 V 2 O 6 F 2 on an electrically conductive substrate.
14. The method of claim 13 wherein the layer is deposited as a slurry.
15. The method of claim 13 wherein the layer further includes electrically conductive particulates.
16. The cathode of claim 4 wherein the material comprises a reaction product of silver oxide, vanadium oxide, and hydrofluoric acid.
17. The battery of claim 5 wherein the material comprises a reaction product of silver oxide, vanadium oxide, and hydrofluoric acid.