Electric double layer capacitor

Abstract

The current invention provides for an electric double layer capacitor which can be manufactured with low manufacturing cost, and an increase of internal resistance due to the damage of a cathode current collector by reflow is inhibited. For this reason, in the current invention, the electric double layer capacitor comprising a cathode 1a, anode 1b, a separator 1c to separate said cathode 1a and anode 1b, electrolytic solution 7 and a container 10 to house said cathode 1a, anode 1b, separator 1c and electrolytic solution 7, wherein said cathode 1a is electrically connected to cathode current collector 2, and said cathode current collector 2 is comprised of alloy of a metal element showing an oxide passivation phenomenon and aluminum.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross section diagram of an electric double layer capacitor according to one embodiment of the current invention.

FIG. 2 illustrates a relationship between Cr contents in a cathode current collector comprised of an Al—Cr alloy and internal resistance after each process.

FIG. 3 illustrates changes in Ni contents in a cathode current collector comprised of an Al—Ni alloy and internal resistance after each process.

Claims

1. An electric double layer capacitor comprising a cathode, an anode, a separator to separate said cathode and anode, an electrolytic solution, and a container to house said cathode, anode, separator, and electrolytic solution, wherein said cathode is electrically connected to a cathode current collector, and said cathode current collector is comprised of an alloy of a metal element showing an oxide passivation phenomenon and aluminum.

2. The electric double layer capacitor according to claim 1, wherein said metal element is chromium.

3. The electric double layer capacitor according to claim 2, wherein said chromium content is no less than 10 atomic % and no more than 95 atomic %.

4. The electric double layer capacitor according to claim 2, wherein said chromium content is no less than 20 atomic % and no more than 80 atomic %.

5. The electric double layer capacitor according to claim 1, wherein said metal element is nickel.

6. The electric double layer capacitor according to claim 5, wherein said nickel content is no less than 5 atomic % and no more than 50 atomic %.

7. The electric double layer capacitor according to claim 1, wherein said metal element is molybdenum.

8. The electric double layer capacitor according to claim 1, wherein said metal element is tungsten.

9. The electric double layer capacitor according to claim 1, wherein said cathode current collector is a film in a thickness no less than 0.3 μm and no more than 50 μm.

10. An electric double layer capacitor comprising a cathode, an anode, a separator to separate said cathode and anode, an electrolytic solution, and a container to house said cathode, anode, separator, and electrolytic solution, wherein said cathode is electrically connected to a cathode current collector, and said cathode current collector is comprised of an alloy of chromium and aluminum.

11. The electric double layer capacitor according to claim 10, wherein said chromium content in said alloy is no less than 10 atomic % and no more than 95 atomic %.

12. The electric double layer capacitor according to claim 10, wherein said cathode current collector is a film in a thickness no less than 0.3 μm and no more than 50 μm.

13. An electric double layer capacitor comprising a cathode, an anode, a separator to separate said cathode and anode, an electrolytic solution, and a container to house said cathode, anode, separator, and electrolytic solution, wherein said cathode is electrically connected to a cathode current collector, said cathode current collector is comprised of an alloy of chromium and aluminum, and said chromium content of said alloy is approximately 50 at %.