Dry particle based energy storage device product
View Patent ↗An inexpensive and reliable dry process based capacitor and method for making a self-supporting dry electrode film for use therein is disclosed. Also disclosed is an exemplary process for manufacturing an electrode for use in an energy storage device product, the process comprising: supplying dry carbon particles; supplying dry binder; dry mixing the dry carbon particles and dry binder; and dry fibrillizing the dry binder to create a matrix within which to support the dry carbon particles as dry material.
1. An energy storage device product, comprising: a self supporting film comprising of a dry mix of dry carbon and dry binder particles, wherein the dry mix comprises substantially no processing additives.
2. The product of claim 1 , wherein the dry mix comprises a dry fibrillized mix.
3. The product of claim 2 , wherein the dry mix is dry fibrillized by application of high-shear forces.
4. The process of claim 3 , wherein the high-shear forces are performed in a jet-mill.
5. The product of claim 2 , wherein the dry mix is dry fibrillized by application of a high pressure.
6. The product of claim 5 , wherein the high pressure is applied by a dry high pressure gas.
7. The product of claim 6 , wherein the high pressure is applied by air with a dew point between about −120 and −40 degrees F.
8. The product of claim 1 , wherein the self-supporting film comprises a thickness of less than about 250 microns.
9. The product of claim 1 , wherein the self-supporting film is calendered onto a first side of a substrate.
10. The product of claim 9 , wherein the self-supporting film is calendered directly onto the first side of the substrate.
11. The product of claim 9 , wherein the substrate comprises a collector.
12. The product of claim 11 , wherein the collector comprises an aluminum foil.
13. The product of claim 9 wherein a second self-supporting substrate is calendered on a second side of the collector opposite the first side.
14. The product of claim 1 , wherein the dry binder comprises a fibrillizable fluoropolymer.
15. The product of claim 1 , wherein the dry carbon of the self-supporting film comprises dry activated carbon and dry conductive carbon.
16. The product of claim 1 , wherein the self-supporting film further comprises dry conductive particles.
17. The product of claim 16 , wherein the dry conductive particles comprise a metal.
18. The product of claim 1 , wherein the processing additives are selected from a group consisting of: hydrocarbons, high boiling point solvents, antifoaming agents, surfactants, dispersion aids, water, pyrrolidone mineral spirits, ketones, naphtha, acetates, alcohols, glycols, toluene, xylene, and isoparaffinic fluids.
19. The product of claim 1 , wherein the self-supporting film comprises an electrode of a capacitor.
20. The product of claim 1 , wherein the self-supporting film comprises an electrode of a double-layer capacitor.