Composite electrode and current collectors and processes for making the same
View Patent ↗Composite electrode/current collectors for capacitors, e.g., a flow-through capacitor or electric double layer capacitor are disclosed. Also disclosed are methods for making a composite electrode/current collectors and capacitors having at least one composite electrode/current collector.
1. A capacitor comprising
a. a separator;
b. at least one pair of opposed retaining plates; and
c. at least one composite electrode/current collector disposed between the separator and one of the opposed retaining plates, wherein the composite electrode/current collector comprises a a sheet of exfoliated graphite and electrode material formed into a single element and further wherein the sheet of exfoliated graphite has an area weight of at least about 7.5 mg/cm 2 .
2. The capacitor according to claim 1 , wherein said electrode material comprises activated carbon having a BET surface area of at least about 200 m 2 /g.
3. The capacitor according to claim 1 , wherein said compressed mass comprises up to about 100 μm thick layer of exfoliated graphite.
4. The capacitor according to claim 1 , wherein said capacitor substantially devoid of an aluminum element capable of conducting electricity.
5. The capacitor according to claim 1 , wherein the BET surface area of said activated carbon is at least about 1000 m 2 /g.
6. The capacitor according to claim 1 , wherein said electrode material further comprises a polymeric binder substantially non-reactive with an electrolyte of said capacitor.
7. The capacitor according to claim 1 , wherein said electrode material further comprises a conductive additive.
8. The capacitor according to claim 1 , wherein said the composite electrode/current collector comprises at least about 5% by weight of said exfoliated graphite.
9. The capacitor according to claim 1 , wherein said capacitor is substantially devoid of an aluminum element having a thickness of more than about 15 μm.
10. A capacitor comprising
a. a separator;
b. at least one pair of opposed retaining plates; and
c. at least one composite electrode/current collector disposed between the separator and one of the opposed retaining plates, wherein the composite electrode/current collector comprises a compressed mass of exfoliated graphite and electrode material formed into a single element and further wherein said the composite electrode/current collector comprises at least about 5% by weight of said exfoliated graphite.
11. The capacitor according to claim 10 , wherein said electrode material comprises activated carbon having a BET surface area of at least about 200 m 2 /g.
12. The capacitor according to claim 10 , wherein said compressed mass comprises up to about 100 μm thick layer of exfoliated graphite.
13. The capacitor according to claim 10 , wherein said compressed mass comprises a sheet of exfoliated graphite having an area weight of at least about 7.5 mg/cm 2 .
14. The capacitor according to claim 10 , wherein said capacitor substantially devoid of an aluminum element capable of conducting electricity.
15. The capacitor according to claim 10 , wherein the BET surface area of said activated carbon is at least about 1000 m 2 /g.
16. The capacitor according to claim 10 , wherein said electrode material further comprises a polymeric binder substantially non-reactive with an electrolyte of said capacitor.
17. The capacitor according to claim 10 , wherein said electrode material further comprises a conductive additive.
18. The capacitor according to claim 10 , wherein said capacitor is substantially devoid of an aluminum element having a thickness of more than about 15 μm.