Double layer capacitor and its manufacturing method
First Claim
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1. A double layer capacitor which comprises a conductive coating comprising a melamine resin binder, at the interfaces between current collectors and electrodes, the conductive coating is provided from a mixture composed essentially of:
- 5-50% by weight of carbon blacks;
5-20% by weight of graphite;
5-40% by weight of a melamine resin binder and polymerisation reaction partner;
25-85% by weight of solvent; and
0-10% by weight of auxiliary materials selected from the group consisting of dispersing agents, defoaming agents and rheological control agents.
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Abstract
A double layer capacitor and a method for producing the same wherein the double layer capacitor comprises a conductive coating based on binders of the melamine resin type such that the conductive coating is present at the interfaces between the current collectors and the electrodes. The double layer capacitor thus produced has good mechanical and chemical integrity and flexibility and is suitable for use in combination with batteries.
54 Citations
63 Claims
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1. A double layer capacitor which comprises a conductive coating comprising a melamine resin binder, at the interfaces between current collectors and electrodes, the conductive coating is provided from a mixture composed essentially of:
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5-50% by weight of carbon blacks;
5-20% by weight of graphite;
5-40% by weight of a melamine resin binder and polymerisation reaction partner;
25-85% by weight of solvent; and
0-10% by weight of auxiliary materials selected from the group consisting of dispersing agents, defoaming agents and rheological control agents. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A double layer capacitor which comprises a conductive coating comprising a melamine resin binder, at the interfaces between current collectors and electrodes and wherein the conductive coating comprises the XZ302 screen printing dye.
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8. A method for the fabrication of a double layer capacitor comprising the steps of:
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mixing carbon blacks and graphites in an alcohol, a glycol or glycol either with a polymerization reaction partner, a dispersing agent and defoaming agent to produce a mill base;
adding melamine resin and a rheological control agent to obtain a uniform conductive coating paste;
applying conductive coating paste onto a current collector by coating or printing to produce a conductive coating;
curing said conductive coating by heating to 100-150°
C. for 10-30 minutes;
preparing an electrode paste as described above from active carbon, binder, solvent and optionally graphite and auxiliary materials;
applying said electrode paste onto the conductive coating by coating or printing to produce a conductive coating-electrode laminate;
sandwiching between two conductive coating-electrode laminates a porous separator to form a capacitor laminate;
confining said capacitor laminate in a polymer coated metal pouch;
preparing the electrolyte solution by dissolving the electrolyte salt in the electrolyte solvent;
impregnating the capacitor laminate with the electrolyte solution;
sealing the pouch. - View Dependent Claims (9)
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- 10. A double layer capacitor, which comprises an ion-conducting phase, at least one electrode and at least one current collector having an interface with said at least one electrode, and a conductive coating comprising a melamine resin binder provided at said interface between said current collector and said at least electrode.
- 36. A double layer capacitor comprising at least one carbon electrode structure with a polymer binder, a non-aqueous electrolyte and at least one metal foil current collector having an interface with said at least one carbon electrode structure, and a conductive coating comprising a melamine resin binder provided at said interface between said at least one current collector and said at least one electrode structure.
Specification