Dry-particle based adhesive and dry film and methods of making same
View Patent ↗Dry process based energy storage device structures and methods for using a dry adhesive therein are disclosed.
1. A method of manufacturing a lithium ion battery, the method comprising:
dry milling dry carbon particles, dry lithium compound particles, and dry binder consisting essentially of fibrillizable binder particles, wherein the dry milling is performed in the absence of solvent and additional binders to form a milled dry cathode powdered mixture;
feeding the milled dry cathode powdered mixture to rollers;
calendering the milled dry cathode powdered mixture between the rollers to form a dry cathode film;
applying the dry cathode film to an electrically conductive substrate to form the cathode;
providing an anode; and
placing the cathode and the anode in a housing comprising an electrolyte to form the lithium ion battery.
2. The method of claim 1 , wherein the dry carbon particles comprise conductive carbon particles.
3. The method of claim 1 , wherein the dry carbon particles comprise graphite particles.
4. The method of claim 1 , wherein the dry carbon particles comprise carbon black particles.
5. The method of claim 1 , wherein the lithium compound particles comprise lithium metal oxide particles.
6. The method of claim 5 , wherein the lithium metal oxide particles comprise at least one of lithium cobalt oxide particles and lithium manganese oxide particles.
7. The method of claim 1 , wherein the dry binder consists essentially of fluoropolymer particles.
8. The method of claim 1 , wherein the dry binder consists essentially of polytetrafluoroethylene (PTFE).
9. The method of claim 1 , wherein the dry binder consists of polytetrafluoroethylene (PTFE).
10. The method of claim 1 , wherein the dry milling comprises jet milling.
11. The method of claim 1 , wherein the dry milling comprises dry milling up to 10% dry carbon particles, 50% to 96% dry lithium compound particles, and 0.5% to 30% fibrillizable binder particles to form the dry cathode film.
12. The method of claim 1 , wherein calendering the milled dry cathode powdered mixture comprises compressing the milled dry cathode powdered mixture in a roll mill.
13. The method of claim 12 , wherein the roll mill is a heated roll mill.
14. The method of claim 1 , wherein the dry cathode film is a self-supporting dry cathode film.
15. The method of claim 1 , wherein the dry cathode film has a compression density greater than or equal to about 0.45 gm/cm 3 .
16. The method of claim 1 , wherein applying the dry cathode film to the electrically conductive substrate comprising laminating the dry cathode film to the electrically conductive substrate.
17. The method of claim 1 , wherein the electrically conductive substrate comprises a metal foil.
18. The method of claim 1 , wherein providing the anode comprises:
dry milling second dry carbon particles and a second dry binder consisting essentially of fibrillizable binder particles, wherein the dry milling is performed in the absence of solvent and additional binders to form a milled dry anode powdered mixture;
compressing the dry anode powdered mixture to form a dry anode film; and
applying the dry anode film to a second electrically conductive substrate to form the anode.
19. The method of claim 18 , wherein the dry milling to form a dry anode mixture comprises dry mixing 80% to 96% graphite, up to 10% carbon black, and 4% to 10% fibrillizable binder particles to form a dry anode film.
20. The method of claim 1 , wherein the dry milling comprises pin milling.
21. The method of claim 1 , wherein the dry milling comprises roll milling.
22. The method of claim 1 , wherein the dry milling comprises hammer milling.
23. The method of claim 1 , wherein the dry mixture is a dry particulate mixture.
24. The method of claim 23 , wherein the dry particulate mixture is a dry powdered mixture.