ULTRACAPACITOR ELECTRODE WITH CONTROLLED SULFUR CONTENT
First Claim
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1. A method of making an active electrode material, the method comprising:
- providing activated carbon with a sulfur content in the range of about 0 and about 300 parts per million;
providing binder; and
,mixing the activated carbon and the binder to obtain a mixture of active electrode material.
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Abstract
Particles of active electrode material are made by blending mixing a mixture of activated carbon and binder. In selected implementations, sulfur level in the activated carbon is relatively low and the binder is inert. For example, sulfur content of the activated carbon and the resultant mixture is below 300 ppm and in other implementations, below 50 ppm. The electrode material may be attached to a current collector to obtain an electrode for use in various electrical devices, including a double layer capacitor. The electrode decreases current leakage of the capacitor.
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Citations
20 Claims
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1. A method of making an active electrode material, the method comprising:
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providing activated carbon with a sulfur content in the range of about 0 and about 300 parts per million; providing binder; and
,mixing the activated carbon and the binder to obtain a mixture of active electrode material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electrode comprising:
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a current collector; and a film of active electrode material attached to the current collector, wherein the active electrode material has a sulfur content in the range of about 0 to about 300 ppm. - View Dependent Claims (11, 12, 13)
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14. A method of making an active electrode material, the method comprising:
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providing activated carbon with a sulfur content in the range of about 0 and about 300 parts per million; providing low contamination level conductive carbon particles; providing binder; and
,mixing the activated carbon, the conductive carbon, and the binder to obtain a mixture such that the mixture has a sulfur content in the range of about 0 and about 300 parts per million. - View Dependent Claims (15, 16, 17, 18, 20)
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19. An electrochemical double layer capacitor comprising:
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a first electrode comprising a first current collector and a first film of active electrode material, the first film comprising a first surface and a second surface, the first current collector being attached to the first surface of the first film; a second electrode comprising a second current collector and a second film of active electrode material, the second film comprising a third surface and a fourth surface, the second current collector being attached to the third surface of the second film; a porous separator disposed between the second surface of the first film and the fourth surface of the second film; a container; an electrolyte; wherein; the first electrode, the second electrode, the porous separator, and the electrolyte are disposed in the container; the first film is at least partially immersed in the electrolyte; the second film is at least partially immersed in the electrolyte; the porous separator is at least partially immersed in the electrolyte; each of the first and second films include a mixture of carbon and binder with a resulting sulfur content not exceeding about 300 parts per million.
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Specification