# US 2019/0172649 A1 · Ceramic-wound-capacitor with lead lanthanum zirconium titanate dielectric

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- Number: US 2019/0172649 A1
- Document ID: US20190172649A1
- Status: Published application
- Kind: A1
- Application number: 16/190,477
- Filed: 2018-11-14
- Published: 2019-06-06
- Earliest claimed: 2016-04-18
- Assignees: Delphi Technologies IP Limited
- Applicants: Delphi Technologies IP Limited
- Inventors: Manuel R. Fairchild; Ralph S. Taylor; David W. Ihms; Celine W. Wong
- Web page: https://patentgrep.com/patent/US20190172649A1

## CPC

- H01G 4/32: Wound capacitors
- C04B 35/491: based on lead zirconates and lead titanates {, e.g. PZT}
- C04B 35/493: containing also other lead compounds
- C04B 35/62222: {obtaining ceramic coatings (coating of mortars, concrete, artificial or natural stone or ceramics C04B41/45; laminated ceramic products B32B18/00; coating of glass C03C17/00, applying ceramic coatings on silicon for semi-conductor purposes H10W; coating metallic materials C23)}
- H01G 4/005: Electrodes
- H01G 4/1218: {based on titanium oxides or titanates (H01G4/1245 takes precedence)}
- H01G 4/1245: {containing also titanates}
- H01G 13/00: Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- C04B 2235/3227: Lanthanum oxide or oxide-forming salts thereof
- C04B 2235/3293: Tin oxides, stannates or oxide forming salts thereof, e.g. indium tin oxide [ITO]
- C04B 2235/768: Perovskite structure ABO3
- 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)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

A ceramic-wound-capacitor includes a first-electrically-conductive-layer, a dielectric-layer, a second-electrically-conductive-layer, and a protective-coating. The dielectric-layer is formed of an antiferroelectric lead-lanthanum-zirconium-titanate. The protective-coating has a thickness of less than ten micrometers (10 μm) and provides electrical isolation between the first-electrically-conductive-layer and the second-electrically-conductive-layer of the ceramic-wound-capacitor. A method for fabricating the ceramic-wound-capacitor includes the steps of feeding a carrier-strip, depositing a sacrificial layer, depositing a first-electrically-conductive-layer, depositing a dielectric-layer, and depositing a second-electrically-conductive-layer to form an arrangement coupled to the carrier-strip by the sacrificial-layer, separating the arrangement from the carrier-strip and sacrificial-layer, creating an exposed-surface of the first-electrically-conductive-layer, applying a protective-coating to the exposed-surface of the first-electrically-conductive-layer, winding the arrangement with the protective-coating to form a ceramic-wound-capacitor, where the protective-coating is in direct contact with the first-electrically-conductive-layer and the second-electrically-conductive-layer of the ceramic-wound-capacitor.

## Claims

### Claim 1

A ceramic-wound-capacitor comprising:
a first-electrically-conductive-layer that defines an exposed-surface;
a dielectric-layer formed of lead-lanthanum-zirconium-titanate which is antiferroelectric and which is in direct contact with the first-electrically-conductive-layer opposite the exposed-surface;
a second-electrically-conductive-layer in direct contact with the dielectric-layer opposite the first-electrically-conductive-layer; and
a protective-coating in direct contact with the exposed-surface, said protective-coating characterized by a thickness of less than 10 micrometers, wherein the first-electrically-conductive-layer, the dielectric-layer, the second-electrically-conductive-layer, and the protective-coating form a capacitive-element, and the capacitive-element is wound to form a ceramic-wound-capacitor.

### Claim 2 (depends on 1)

The ceramic-wound-capacitor in accordance with claim 1, wherein the protective-coating is in direct contact with the second-electrically-conductive-layer after winding.

### Claim 3 (depends on 1)

The ceramic-wound-capacitor in accordance with claim 1, wherein the first-electrically-conductive-layer is formed of one of platinum, nickel, copper, and aluminum.

### Claim 4 (depends on 1)

The ceramic-wound-capacitor in accordance with claim 1, wherein the second-electrically-conductive-layer is formed of one of platinum, nickel, copper, and aluminum.

### Claim 5 (depends on 1)

The ceramic-wound-capacitor in accordance with claim 1, wherein the protective-coating is poly-para-xylylene.

### Claim 6 (depends on 1)

The ceramic-wound-capacitor in accordance with claim 1, wherein the protective-coating is lead-lanthanum-zirconium-titanate.