초록

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.

대표청구항 ▼

1. A method of making a capacitor comprising:a. mixing an effective amount of exfoliated graphite and electrode material to form a mixture having at least about 5 wt % of said exfoliated graphite, wherein, said electrode material comprises:1) at least one material selected from the group consisting

1. A method of making a capacitor comprising:a. mixing an effective amount of exfoliated graphite and electrode material to form a mixture having at least about 5 wt % of said exfoliated graphite, wherein, said electrode material comprises:1) at least one material selected from the group consisting of: graphite, carbon nanotubes, activated carbon fibers, graphite fibers, carbon nanofibers, graphite nanofibers, carbon black, and activated carbon, and2) a surface area of said electrode material comprises at least about 200 m 2 /g;b. compressing said mixture; andc. calendering said mixture. 2. The method according to claim 1, wherein the temperature of said mixture during said calendaring comprises at least about 25° C. 3. The method according to claim 1, further comprising forming a bed of said exfoliated graphite and wherein said mixing comprises dispersing said electrode material onto a top surface of said bed of said exfoliated graphite. 4. The method according to claim 1, further comprising compressing said exfoliated graphite into a sheet having a density of at least about 0.6 g/cc and wherein said mixing comprises dispersing said electrode mixture onto a top surface of said sheet of said exfoliated graphite. 5. The method according to claim 1, further comprising forming a bed of said electrode material, and wherein said mixing comprises dispersing said exfoliated graphite onto said bed of said electrode material. 6. The method according to claim 1, further comprising compounding said electrode material with a polymeric binder. 7. The method according to claim 6, wherein said polymeric binder comprises a fluorinated compound. 8. The method according to claim 1, wherein said exfoliated graphite comprises at least about 95% by wt of graphite, and less than about 100 ppm of each transition metal. 9. The method according to claim 1, wherein a particle size of at least a portion of graphite flake formed into the exfoliated graphite comprises less than about 1000 μm.