Compositions and methods for multilayer dry coated and wet cast film hybrid electrode films
Provided herein are energy storage device electrode films comprising a hybrid electrode film, and methods of forming such multilayer hybrid electrode films and energy storage devices comprising multilayer hybrid electrode films. Each hybrid electrode film may comprise a self-supporting dry coated active layer and a wet cast active layer, wherein each active layer comprises a binder and an active material. The binder and/or active material may be the same or different as any other active layer. The hybrid multilayer electrode film may further comprise at least one additional layer, and the hybrid multilayer electrode film may be laminated with a current collector to form an electrode.
1. A multilayer electrode film for use in an energy storage device comprising:
a dry-processed active layer comprising:
a first active material; and
a fibrillized binder;
wherein the dry-processed active layer is self-supporting and absent of processing solvent residue; and
a wet-processed active layer comprising:
a second active material; and
at least some processing solvent residue.
2. The multilayer electrode film of claim 1 , wherein the dry-processed active layer and the wet-processed active layer are directly disposed over each other.
3. The multilayer electrode film of claim 1 , further comprising an additional layer.
4. The multilayer electrode film of claim 3 , wherein the additional layer is disposed over both the dry-processed active layer and the wet-processed active layer.
5. The multilayer electrode film of claim 3 , wherein the additional layer is disposed between the dry-processed active layer and the wet-processed active layer.
6. The multilayer electrode film of claim 3 , wherein the additional layer is a multilayer additional layer.
7. The multilayer electrode film of claim 3 , wherein the additional layer is selected from the group consisting of a composite powder, a composite film, an adhesive paste, a composite powder paste, and combinations thereof.
8. The multilayer electrode film of claim 7 , wherein the composite powder comprises a powder selected from the group consisting of Si, SiO x , Li x SiO y alloy, Li, Li alloy, and combinations thereof.
9. The multilayer electrode film of claim 7 , wherein the composite film comprises a powder selected from the group consisting of Si, SiO x , Li x SiO y alloy, Li, Li alloy, and combinations thereof.
10. The multilayer electrode film of claim 7 , wherein the adhesive paste comprises an adhesive selected from the group consisting of a room temperature ionic liquid, a conductive carbon paste, a liquid polymer, and combinations thereof.
11. The multilayer electrode film of claim 7 , wherein the composite powder paste further comprises a ceramic filler.
12. The multilayer electrode film of claim 1 , wherein the multilayer electrode film is free-standing.
13. An electrode comprising a current collector and the multilayer electrode film of claim 1 .
14. A battery comprising the electrode of claim 13 .
15. A multilayer electrode film fabrication process comprising:
disposing a dry-processed active layer over a wet-processed active layer; and
laminating the dry-processed and wet-processed active layers to form a multilayer electrode film,
wherein the dry-processed active layer comprises a first active material and a fibrillized binder, and the dry-processed active layer is absent of processing solvent residue, and
wherein the wet-processed active layer comprises a second active material and at least some processing solvent residue.
16. The process of claim 15 , wherein laminating is performed by a process selected from the group consisting of passing the dry-processed and wet-processed active layers between two rollers, passing the dry-processed and wet-processed active layers through one roller while positioned on a moving station, pressing the dry-processed and wet-processed active layers between two plates, and combinations thereof.
17. The process of claim 15 , wherein the dry-processed active layer is a rolled free-standing film before being disposed on the wet-processed active layer, and wherein disposing the dry-processed active layer on the wet-processed active layer comprises unrolling the dry-processed active layer.
18. The process of claim 15 , further comprising disposing an additional layer over the wet-processed active layer.
19. The process of claim 15 , further comprising disposing an additional layer over the dry-processed active layer.
20. The process of claim 15 , further comprising disposing an additional layer over the multilayer electrode film.
21. A multilayer electrode film fabrication process comprising:
disposing an active layer slurry mixture over a dry-processed active layer;
drying the disposed active layer slurry mixture to form a wet-processed active layer comprising:
a second active material; and
at least some processing solvent residue; and
laminating the dry-processed and wet-processed active layers to form a multilayer electrode film,
wherein the dry-processed active layer comprises a first active material and a fibrillized binder, and the dry-processed active layer is absent of processing solvent residue, and
wherein the active layer slurry mixture comprises the second active material and a processing solvent.