Electrolytes for capacitors
AssigneeWilson Greatbatch Technologies, Inc.
InventorsYanming Liu, Ashish Shah
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Abstract
The present invention is directed to an electrolyte for an electrolytic capacitor. The capacitor has an electrolytic anode and an electrochemical cathode. The electrolyte has water, a water soluble organic salt, and a relatively weak organic acid. This electrolyte is chemically compatible to aluminum and tantalum oxide dielectrics and withstands higher voltage while maintaining good conductivity. This makes the electrolyte especially useful for high voltage applications, such as occur in an implantable cardiac defibrillator.
Claims43
An electrolyte for an electrical energy storage device, the electrolyte consisting essentially of:
- a) water;
- b) an organic acid;
- and
- c) an ammonium salt of the organic acid.
An electrolyte for a capacitor, the electrolyte comprising:
- a) water;
- b) an organic solvent;
- c) an organic acid;
- and
- d) an ammonium salt of the organic acid.
A capacitor, which comprises:
- a) an anode of a valve metal;
- b) an electrochemical cathode selected from the group consisting of a transition metal oxide, a transition metal nitride, a transition metal carbide and a transition metal carbon nitride;
- and
- c) an electrolyte for the anode and the cathode, the electrolyte comprising:
- i) water;
- ii) an organic solvent;
- iii) an organic acid;
- and
- iv) an ammonium salt of the organic acid.
A method for providing an electrolyte, consisting essentially of the steps of:
- a) providing water;
- b) providing an organic acid;
- and
- c) providing an ammonium salt of the organic acid.
Dependencies are inferred from the claim text.