Batteries and cathodes containing carbon nanotubes

Patent metadata

Field	Value
Publication number	US-9799887-B2
Application number	US-201414261573-A
Country	US
Kind code	B2
Filing date	Apr 25, 2014
Priority date	Apr 25, 2014
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

Cathodes containing active materials and carbon nanotubes are described. The use of carbon nanotubes in cathode materials can provide a battery having increased longevity and volumetric capacity over batteries that contain a cathode that uses conventional conductive additives such as carbon black or graphite.

First claim

The invention claimed is:

1. A battery comprising:
a lithium metal anode;
an electrolyte; and
a cathode comprising a cathode composition of silver vanadium oxide having the formula Ag 2 V 4 O 11 , carbon monofluoride having the formula CF 1.0 , a binder and conductive additive comprising carbon nanotubes, the silver vanadium oxide and CF 1.0 combined being present the composition in an amount of from 90 to 95% by weight of the composition, the carbon nanotubes being present in an amount of from 3% to 4% by weight of the cathode composition, and the binder being present in the composition in an amount of from 2% to 6% by weight of the composition, wherein the cathode composition has a carbon monofluoride to silver vanadium oxide capacity ratio of from 2:1 to 10:1.

2. The battery of claim 1 , wherein the silver vanadium oxide and carbon monofluoride combined being present the cathode composition in an amount of at least 93% to 95% by weight of the cathode composition.

3. The battery of claim 1 , wherein the carbon monofluoride is present in the cathode composition in an amount of from 20% to 80% by weight of the cathode composition.

4. The battery of claim 1 , wherein the silver vanadium oxide is present in the cathode composition in an amount of from 60% to 20% by weight of the cathode composition.

5. The battery of claim 1 , wherein the conductive additive consists essentially of carbon nanotubes.

6. The battery of claim 1 , further comprising a separator.

7. The battery of claim 1 wherein the anode further comprises a metallic current collector.

8. The battery of claim 1 wherein the cathode further comprises a metallic current collector.

9. A cathode comprising:
silver vanadium oxide having the formula Ag 2 V 4 O 11 ;
a binder;
carbon monofluoride (CF 1.0 ); and
conductive additive comprising carbon nanotubes, wherein the active material and the carbon monofluoride combined is present in an amount of from 90 to 95% by weight, the carbon nanotubes being present in an amount of from 3% to 4% by weight of the cathode composition, and the binder being present in the composition in an amount of from 2% to 6% by weight of the composition, wherein the cathode composition has a carbon monofluoride to silver vanadium oxide capacity ratio of from 2:1 to 10:1.

10. The cathode of claim 9 , wherein the active material and the carbon monofluoride combined is present in an amount of at least 93% to 95% by weight.

11. The cathode of claim 9 , wherein the carbon monofluoride is present in an amount of from 20% to 80% by weight.

12. The cathode of claim 9 further comprising a metallic current collector.

Assignees

• Medtronic Inc

Inventors

• Chen Kaimin
• Jain Gaurav

Classifications

• H01M4/582

  Halogenides · CPC title

• H01M4/5835

  Comprising fluorine or fluoride salts · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M4/54

  of silver · CPC title

• H01M6/16

  with organic electrolyte (H01M6/18 takes precedence) · CPC title