ULTRACAPACITOR ELECTRODE WITH CONTROLLED IRON CONTENT
First Claim
Patent Images
1. A method of making an active electrode material, the method comprising:
- providing activated carbon;
providing binder; and
mixing the activated carbon and the binder to obtain a mixture, wherein the mixture results with an iron content in the range of about 0 and about 20 parts per million.
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Abstract
Particles of active electrode material are made by blending or mixing a mixture of activated carbon, optional conductive carbon, and binder. In selected implementations, iron level in the activated carbon is relatively low, a small amount of conductive carbon with low impurity levels and high conductivity is used, and the binder is inert. For one example, iron content of the activated carbon and the resultant mixture is below 20 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
30 Claims
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1. A method of making an active electrode material, the method comprising:
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providing activated carbon; providing binder; and mixing the activated carbon and the binder to obtain a mixture, wherein the mixture results with an iron content in the range of about 0 and about 20 parts per million. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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 an iron content in the range of about 0 and about 20 ppm. - View Dependent Claims (13, 14, 15)
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16. An electrode comprising:
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a current collector; and a film of active electrode material attached to the current collector, the active electrode material including a mixture of carbon and binder, the mixture formed through mixing in an environment having at least one non-iron introducing source in contact with one or more of the carbon, the binder and the mixture during mixing. - View Dependent Claims (17, 18)
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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 iron content of about equal to or not exceeding about 20 parts per million. - View Dependent Claims (20)
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21. Processing equipment for providing active electrode material, the processing equipment including:
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a non-iron chamber for receiving mixing components of active electrode material; and
,apparatus for mixing the components of the active electrode material. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification