Dry energy storage device electrode and methods of making the same
View Patent ↗An energy storage device can include a cathode and an anode, where at least one of the cathode and the anode are made of a polytetrafluoroethylene (PTFE) composite binder material including PTFE and at least one of polyvinylidene fluoride (PVDF), a PVDF co-polymer, and poly(ethylene oxide) (PEO). The energy storage device can be a lithium ion battery, a lithium ion capacitor, and/or any other lithium based energy storage device. The PTFE composite binder material can have a ratio of about 1:1 of PTFE to a non-PTFE component, such a PVDF, PVDF co-polymer and/or PEO.
1. An electrode film, comprising:
a composite binder material comprising fibrillized polytetrafluoroethylene (PTFE) and poly(ethylene oxide) (PEO); wherein the electrode film is a free standing dry electrode film, and wherein the electrode film is absent of solvent residue.
2. An energy storage device comprising the electrode film of claim 1 , wherein the energy storage device comprises a lithium ion battery.
3. The electrode film of claim 1 , wherein the composite binder material comprises up to 90 weight % PTFE.
4. The electrode film of claim 1 , wherein the composite binder material comprises a mass ratio of 1:5 to 5:1 of the PTFE to the PEO.
5. The electrode film of claim 1 , wherein the film comprises a cathode active material.
6. The electrode film of claim 1 , wherein the electrode film comprises an anode active material.
7. An electrode film, comprising a composite binder material, wherein the composite binder material comprises fibrillized PTFE and at least one of polyvinylidene fluoride (PVDF), or a PVDF co-polymer; wherein the electrode film is a free-standing dry electrode film, and wherein the electrode film is absent of solvent residue.
8. An energy storage device comprising the electrode film of claim 7 wherein the energy storage device comprises a lithium ion battery.
9. The electrode film of claim 7 , wherein the electrode film comprises an anode active material.
10. The electrode film of claim 9 , comprising a carbon active material, wherein the carbon active material comprises graphite.
11. The electrode film of claim 7 , wherein the composite binder material comprises up to 90 weight % PTFE.
12. The electrode film of claim 7 , wherein the electrode film comprises a cathode active material.
13. The electrode film of claim 7 , wherein the composite binder material comprises a mass ratio of 1:5 to 5:1 of the PTFE to the PVDF, or the PTFE to the PVDF co-polymer.
14. The electrode film of claim 7 , wherein the electrode film comprises 2 weight % to 10 weight % of the composite binder material.
15. The electrode film of claim 1 , wherein the electrode film comprises a porous carbon material and an active material selected from a lithium metal oxide, a lithium sulfide, or a combination thereof.
16. The electrode film of claim 15 , wherein the porous carbon material is activated carbon.
17. The electrode film of claim 16 , wherein the electrode film comprises a lithium metal oxide.
18. The electrode film of claim 17 , wherein the lithium metal oxide comprises lithium nickel manganese cobalt oxide.
19. The electrode film of claim 1 , wherein the electrode film comprises 2 weight % to 10 weight % of the composite binder material.
20. The electrode film of claim 4 , wherein the composite binder material comprises a mass ratio of 1:3 to 3:1 of the PTFE to the PEO.