# US 2014/0207221 A1 · Capacitor electrolyte

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- Number: US 2014/0207221 A1
- Document ID: US20140207221A1
- Status: Published application
- Kind: A1
- Application number: 14/166,229
- Filed: 2014-01-28
- Published: 2014-07-24
- Earliest claimed: 2005-06-30
- Assignees: Medtronic, Inc.
- Applicants: Medtronic, Inc.
- Inventors: Mark E. Viste; John D. Norton; Joachim Hossick-Schott; Anthony W. Rorvick
- Web page: https://patentgrep.com/patent/US20140207221A1

## CPC

- A61N 1/3981: {High voltage charging circuitry}
- C25D 11/02: Anodisation
- C25D 11/12: Anodising more than once, e.g. in different baths
- C25D 11/26: of refractory metals or alloys based thereon
- H01G 9/035: Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence)
- H01G 9/042: characterised by the material (H01G11/22 takes precedence)
- H01G 11/52: Separators
- H01G 11/58: Liquid electrolytes
- Y02E 60/13: Energy storage using capacitors
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A capacitor for an implantable medical device is presented. The capacitor includes an anode, a cathode, a separator therebetween, and an electrolyte over the anode, cathode, and separator. The electrolyte includes ingredients comprising acetic acid, ammonium acetate, phosphoric acid, and tetaethylene glycol dimethyl ether. The capacitor has an operating voltage ninety percent or greater of its formation voltage.

## Claims

### Claim at position 1

1-40. (canceled)

### Claim 41

An implantable cardioverter-defibrillator comprising an electrolytic capacitor comprising:
an anode comprising tantalum;
a cathode;
a separator coupled to the anode and the cathode;
an electrolyte comprising water and one or more ingredients selected from acetic acid, ammonium acetate, phosphoric acid, and tetraethylene glycol dimethyl ether; and
an oxide layer on the anode that is formed at a formation voltage.

### Claim 42 (depends on 41)

The implantable cardioverter-defibrillator of claim 41 wherein the electrolyte comprises water and one or more ingredients selected from:
about 1.5 to about 2.5 Molar acetic acid;
about 1.2 to about 2.1 Molar ammonium acetate;
about 0.02 to about 0.5 Molar phosphoric acid; and
about 0.8 to about 1.5 Molar tetraethylene glycol dimethyl ether.

### Claim 43 (depends on 42)

The implantable cardioverter-defibrillator of claim 42 wherein the electrolyte comprises water and about 1.5 to about 2.5 Molar acetic acid.

### Claim 44 (depends on 42)

The implantable cardioverter-defibrillator of claim 42 wherein the electrolyte comprises water and about 1.2 to about 2.1 Molar ammonium acetate.

### Claim 45 (depends on 42)

The implantable cardioverter-defibrillator of claim 42 wherein the electrolyte comprises water and about 0.02 to about 0.5 Molar phosphoric acid.

### Claim 46 (depends on 42)

The implantable cardioverter-defibrillator of claim 42 wherein the electrolyte comprises water and about 0.8 to about 1.5 Molar tetraethylene glycol dimethyl ether.

### Claim 47 (depends on 42)

The implantable cardioverter-defibrillator of claim 42 wherein, during use of the cardioverter-defibrillator, the capacitor is repeatedly charged to an operating voltage of greater than 90 percent of its formation voltage.

### Claim 48 (depends on 47)

The implantable cardioverter-defibrillator of claim 47 wherein, during use of the cardioverter-defibrillator, the capacitor is repeatedly charged to an operating voltage of greater than 93 percent of its formation voltage.

### Claim 49 (depends on 48)

The implantable cardioverter-defibrillator of claim 48 wherein, during use of the cardioverter-defibrillator, the capacitor is repeatedly charged to an operating voltage of greater than 95 percent of its formation voltage.

### Claim 50 (depends on 49)

The implantable cardioverter-defibrillator of claim 49 wherein, during use of the cardioverter-defibrillator, the capacitor is repeatedly charged to an operating voltage of greater than 98 percent of its formation voltage.

### Claim 51 (depends on 47)

The implantable cardioverter-defibrillator of claim 47 wherein the electrolyte comprises:
water;
about 1.5 to about 2.5 Molar acetic acid;
about 1.2 to about 2.1 Molar ammonium acetate;
about 0.02 to about 0.5 Molar phosphoric acid; and
about 0.8 to about 1.5 Molar tetraethylene glycol dimethyl ether.

### Claim 52 (depends on 42)

The implantable cardioverter-defibrillator of claim 42 wherein the electrolyte has a working voltage at least equivalent to its nominal working voltage.

### Claim 53 (depends on 42)

The implantable cardioverter-defibrillator of claim 42 wherein the electrolyte has a working voltage greater than its nominal working voltage.

### Claim 54 (depends on 41)

The implantable cardioverter-defibrillator of claim 41 wherein, during use of the cardioverter-defibrillator, the capacitor is repeatedly charged to an operating voltage of greater than 90 percent of its formation voltage.

### Claim 55 (depends on 54)

The implantable cardioverter-defibrillator of claim 54 wherein, during use of the cardioverter-defibrillator, the capacitor is repeatedly charged to an operating voltage of greater than 93 percent of its formation voltage.

### Claim 56 (depends on 55)

The implantable cardioverter-defibrillator of claim 55 wherein, during use of the cardioverter-defibrillator, the capacitor is repeatedly charged to an operating voltage of greater than 95 percent of its formation voltage.

### Claim 57 (depends on 56)

The implantable cardioverter-defibrillator of claim 56 wherein, during use of the cardioverter-defibrillator, the capacitor is repeatedly charged to an operating voltage of greater than 98 percent of its formation voltage.

### Claim 58 (depends on 54)

The implantable cardioverter-defibrillator of claim 54 wherein the electrolyte comprises water, acetic acid, ammonium acetate, phosphoric acid, and tetraethylene glycol dimethyl ether.

### Claim 59 (depends on 41)

The implantable cardioverter-defibrillator of claim 41 wherein the electrolyte has a working voltage at least equivalent to its nominal working voltage.

### Claim 60 (depends on 41)

The implantable cardioverter-defibrillator of claim 41 wherein the electrolyte has a working voltage greater than its nominal working voltage.