Working electrolyte for electrolytic capacitors
AssigneeKemet Electronics Corporation
InventorsJohn Tony Kinard, Brian John Melody, David Alexander Wheeler
Life of this patent
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Abstract
An electrolyte for a capacitor and capacitor containing the electrolyte. The electrolyte has up to about 85%, by weight, water, up to about 65%, by weight organic solvent and an acid defined by HOOC—(CH2)x—COOH wherein x is 3, 5, 7 or 9, and ammonium hydroxide.
Claims45
An electrolyte for a capacitor comprising:
- up to about 85%, by weight, water;
- up to about 65%, by weight organic solvent;
- an acid consisting essentially of Formula I:
- HOOC—(CH2)x—COOH Formula I
- wherein x is 3, 5, 7 or 9;
- and ammonium hydroxide.
An electrolyte for a capacitor comprising:
- up to about 85%, by weight, water;
- up to about 65%, by weight, organic solvent;
- an acid defined by Formula I:
- HOOC—(CH2)x—COOH Formula I
- wherein x is 3, 5, 7 or 9;
- and
- ammonium hydroxide wherein said ammonium hydroxide is present in a molar amount of at least about 0.9 to no more than about 2.1 times the molar amount of said Formula I.
An electrolyte for a capacitor comprising:
- up to about 85%, by weight, water;
- up to about 65%, by weight, organic solvent;
- an acid defined by Formula I:
- HOOC—(CH2)x—COOM Formula I
- wherein x is 3, 5, 7 or 9;
- and
- ammonium hydroxide wherein said organic solvent is selected from a diol, a N-alkyl substituted amide and a lacitone.
An electrolyte for a capacitor comprising:
- up to about 85%, by weight, water;
- up to about 65%, by weight, organic solvent;
- and
- NH4OOC—(CH2)x—COONH4 wherein x is 3, 5, 7 or 9;
- wherein said electrolyte is at a pH of about 4 to about 9.
A capacitor comprising an electrolyte wherein said electrolyte comprises:
- about 30 to about 85%, by weight, water;
- an organic solvent;
- an acid defined by Formula I:
- HOOC—(CH2)x—COOH Formula I
- wherein x is 3, 5, 7 or 9;
- and
- ammoniurn hydroxide;
- and
- wherein said electrolyte has a pH of about 4 to about 9.
A capacitor comprising an electrolyte wherein said electrolyte comprises:
- about 30 to about 85%, by weight, water;
- an organic solvent;
- an acid defined by Formula I:
- HOOC—(CH2)x—COOH Formula I
- wherein x is 3, 5, 7 or 9;
- and
- ammonium hydroxide;
- and
- wherein said electrolyte has a pH of about 4 to about 9 wherein said ammonium hydroxide is present in a molar amount of at least about 0.9 to no more than about 2.1 times the molar amount of said Formula I.
A capacitor comprising an electrolyte wherein said electrolyte comprises:
- about 30 to about 85%, by weight, water;
- an organic solvent;
- an acid defined by Formula I:
- HOOC— (CH2)x—COOH Formula I
- wherein x is 3, 5, 7 or 9;
- and
- ammonium hydroxide;
- and
- wherein said electrolyte has a pH of about 4 to about 9 wherein said organic solvent is selected from a diol, a N-alkyl substituted amide and a lactone.
An electrolyte for a capacitor comprising:
- up to about 85%, by weight, water;
- up to about 65%, by weight organic solvent;
- an acid defined by Formula I:
- HOOC— (CH2)x—COOH Formula I
- wherein x is 3, 5, 7 or 9;
- and
- ammonium hydroxide;
- wherein said electrolyte does not expand upon freezing and no precipitate remains upon thawing.
An electrolyte for a capacitor comprising:
- from 30% up to about 85%, by weight, water;
- up to about 65%, by weight organic solvent;
- a compound defined by Formula I:
- ROOC—(CH2)x—COOR Formula I
- wherein R is selected from H+ and NH4+;
- wherein x is 3, 5, 7 or 9;
- wherein said electrolyte is at a pH Qf about 4 to about 9;
- and
- said electrolyte does not contain benzoic acid.
Dependencies are inferred from the claim text.