# US 10,312,020 B2 · Multilayer ceramic capacitor

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- Number: US 10,312,020 B2
- Document ID: US10312020B2
- Status: Granted
- Kind: B2
- Application number: 15/600,609
- Filed: 2017-05-19
- Published: 2017-11-30
- Granted: 2019-06-04
- Earliest claimed: 2016-05-24
- Assignees: Taiyo Yuden Co., Ltd.
- Applicants: Taiyo Yuden Co., Ltd.
- Inventors: Minoru Ryu; Mikio Tahara; Hirokazu Orimo
- Web page: https://patentgrep.com/patent/US10312020B2

## CPC

- H01G 4/1209: {characterised by the ceramic dielectric material (H01G4/1272, H01G4/1281 take precedence)}
- H01G 4/005: Electrodes
- H01G 4/10: Metal-oxide dielectrics {(H01G4/085 takes precedence)}
- H01G 4/2325: {characterised by the material of the terminals}
- H01G 4/30: Stacked capacitors (H01G4/33 takes precedence)
- H01G 4/0085: {Fried electrodes}
- H01G 4/12: Ceramic dielectrics {(H01G4/085 takes precedence)}
- H01M 4/32: Nickel oxide or hydroxide electrodes
- Y02E 60/10: Energy storage using batteries
- 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)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

In an embodiment, a multilayer ceramic capacitor 10 has a first external electrode 12 and a second external electrode 13 that each contain metal grains MP and dielectric grains DP, where an oxide of the same metal element constituting the metal grain MP, or MO, is present at the interface between the metal grain MP and the dielectric grain DP. The multilayer ceramic capacitor can prevent the hardness of its external electrodes from dropping, even when the external electrodes contain metal grains and dielectric grains.

## Claims

### Claim 1

A multilayer ceramic capacitor using external electrodes that contain metal grains and dielectric grains, wherein a metal oxide of a same metal element constituting the metal grain is present at an interface between the metal grain and the dielectric grain of the external electrodes, wherein the dielectric grains contain barium titanate.

### Claim 2 (depends on 1)

A multilayer ceramic capacitor according to claim 1, wherein the metal oxide is present intermittently at the interface between the metal grain and the dielectric grain.

### Claim 3 (depends on 1)

A multilayer ceramic capacitor according to claim 1, wherein a metal element constituting the metal grain is a base metal element.

### Claim 4 (depends on 2)

A multilayer ceramic capacitor according to claim 2, wherein a metal element constituting the metal grain is a base metal element.

### Claim 5 (depends on 1)

A multilayer ceramic capacitor according to claim 1, wherein a metal element constituting the metal grain is nickel.

### Claim 6 (depends on 2)

A multilayer ceramic capacitor according to claim 2, wherein a metal element constituting the metal grain is nickel.

### Claim 7 (depends on 1)

A multilayer ceramic capacitor according to claim 1, wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

### Claim 8 (depends on 2)

A multilayer ceramic capacitor according to claim 2, wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

### Claim 9 (depends on 3)

A multilayer ceramic capacitor according to claim 3, wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

### Claim 10 (depends on 4)

A multilayer ceramic capacitor according to claim 4, wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

### Claim 11 (depends on 5)

A multilayer ceramic capacitor according to claim 5, wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

### Claim 12 (depends on 6)

A multilayer ceramic capacitor according to claim 6, wherein a thickness of the metal oxide is in a range of 50 nm to 500 nm.

### Claim 13 (depends on 1)

A multilayer ceramic capacitor according to claim 1, wherein the external electrodes are formed, opposing each other, on two end faces of a capacitor body, wherein the capacitor body is constituted by a capacitive part including internal electrode layers, and dielectric cover parts formed on upper and lower faces of the capacitive part, respectively, wherein a primary component of the capacitor body, except for the internal electrode layers, is barium titanate which is the same component contained in the dielectric grains of the external electrodes.