Multilayer ceramic electronic component including external electrode having surface roughness

Patent metadata

Field	Value
Publication number	US-11495408-B2
Application number	US-202016842455-A
Country	US
Kind code	B2
Filing date	Apr 7, 2020
Priority date	Sep 19, 2019
Publication date	Nov 8, 2022
Grant date	Nov 8, 2022

Abstract

A multilayer ceramic electronic component includes a ceramic body including a dielectric layer and first and second internal electrodes disposed to be stacked in a third direction with the dielectric layer interposed therebetween; and first and second external electrodes disposed on the third and fourth surfaces of the ceramic body, respectively. The first and second external electrodes comprise first and second base electrodes disposed to be in contact with the ceramic body and having a first conductive metal, and first and second conductive layers disposed on the first and second base electrodes and having a second conductive metal, and the first and second conductive layers have an average surface roughness (Ra) of 10.0 μm or more.

First claim

What is claimed is:

1. A multilayer ceramic electronic component, comprising:
a ceramic body including a dielectric layer and first and second internal electrodes stacked in a third direction with the dielectric layer interposed therebetween, and having a third surface and a fourth surface opposed in a first direction, a fifth surface and a sixth surface opposed in a second direction, and a first surface and a second surface opposed in the third direction; and
first and second external electrodes disposed on the third and fourth surfaces of the ceramic body, respectively,
wherein the first external electrode comprises a first base electrode disposed to be in contact with the ceramic body and having a first conductive metal, a first conductive layer disposed on the first base electrode and having a second conductive metal, and a first terminal electrode covering the first conductive layer,
the second external electrode comprises a second base electrode disposed to be in contact with the ceramic body and having the first conductive metal, a second conductive layer disposed on the second base electrode and having the second conductive metal, and a second terminal electrode covering the second conductive layer, and
the first and second conductive layers have an average surface roughness (Ra) of 10.0 μm or more.

2. The multilayer ceramic electronic component of claim 1 , wherein the first and second base electrodes and the first and second conductive layers comprise conductive metals different from each other.

3. The multilayer ceramic electronic component of claim 1 , wherein the first and second base electrodes comprise the first conductive metal and glass.

4. The multilayer ceramic electronic component of claim 3 , wherein a region in which the first conductive metal and the second conductive metal are in contact with an interface between the first base electrode and the first second conductive layer or an interface between the second base electrode and the second conductive layer, and a region in which the glass and the second conductive metal are in contact, are randomly disposed.

5. The multilayer ceramic electronic component of claim 1 , wherein the first and second base electrodes comprise copper (Cu).

6. The multilayer ceramic electronic component of claim 1 , wherein the first and second base electrodes have an average surface roughness (Ra) of 1.0 μm or more.

7. The multilayer ceramic electronic component of claim 1 , wherein a standard reduction potential of the second conductive metal is higher than a standard reduction potential of the first conductive metal.

8. The multilayer ceramic electronic component of claim 1 , wherein the second conductive metal has a standard reduction potential of 0.1V or more.

9. The multilayer ceramic electronic component of claim 1 , wherein each of the first and second conductive layers is a single composition layer of the second conductive metal.

10. The multilayer ceramic electronic component of claim 1 , wherein each of the first and second conductive layers includes a reduced layer of the second conductive metal.

11. The multilayer ceramic electronic component of claim 1 , wherein the first and second conductive layers comprise one or more structures selected from a group consisting of nanoparticles, nanowires, nanorods, nanobars, nanobelts, nanodisks, nanotubes, and nanotetrapods.

12. A multilayer ceramic electronic component, comprising:
a ceramic body including first and second internal electrodes and a dielectric layer disposed between the first and second internal electrodes; and
an external electrode disposed on the ceramic body and connected to one of the first and second internal electrodes,
wherein the external electrode comprises a base electrode in contact with the ceramic body and having a first conductive metal, and a conductive layer disposed on the base electrode and having a second conductive metal,
an average surface roughness of an inner surface of the conductive layer in contact with the base electrode, and an average surface roughness of an outer surface of the conductive layer opposing the inner surface, are greater than an average surface roughness of a surface of the base electrode in contact with the ceramic body,
a standard reduction potential of the second conductive metal is higher than a standard reduction potential of the first conductive metal, and
the first conductive metal is copper (Cu).

13. The multilayer ceramic electronic component of claim 12 , wherein the base electrode and the conductive layer comprise conductive metals different from each other.

14. The multilayer ceramic electronic component of claim 12 , wherein the base electrode comprises the first conductive metal and glass.

15. The multilayer ceramic electronic component of claim 12 ,
wherein the conductive layer comprises one or more structures selected from a group consisting of nanoparticles, nanowires, nanorods, nanobars, nanobelts, nanodisks, nanotubes, and
nanotetrapods.

16. The multilayer ceramic electronic component of claim 12 , further comprising a terminal electrode covering the conductive layer.

Assignees

• Samsung Electro Mech

Inventors

• Kang Jeong Mo
• Yun Hyung Duk
• Jeong Eun Hee

Classifications

• H01G4/1227

  based on alkaline earth titanates · CPC title

• H01G4/12

  Ceramic dielectrics {(H01G4/085 takes precedence)} · CPC title

• H01G4/30 Primary

  Stacked capacitors (H01G4/33 takes precedence) · CPC title

• H01G4/005 Primary

  Electrodes · CPC title

• H01G4/232

  electrically connecting two or more layers of a stacked or rolled capacitor · CPC title