Solid electrolytic capacitor
View Patent ↗A silver paste layer constituting a collector layer in a solid electrolytic capacitor includes first silver particles having a peak particle size of 150 nm or less, second silver particles having a peak particle size of 500 nm or more, inorganic particles composed of material different from silver, and resin material. The inorganic particles are included at a volume ratio of 15% or more and 50% or less with respect to the total of the first silver particles and the second silver particles.
1. A solid electrolytic capacitor comprising:
a capacitor element having a base body composed of conductive material, a dielectric film formed on the base body, a solid electrolyte layer formed on the dielectric film, and a collector layer formed on the solid electrolyte layer and including at least a silver paste layer;
a first external terminal electrically connected to the base body; and
a second external terminal electrically connected to the collector layer,
wherein the silver paste layer includes:
first silver particles having a peak particle size of 150 nm or less;
second silver particles having a peak particle size of 500 nm or more;
inorganic particles composed of material different from silver; and
resin material,
wherein the inorganic particles are conductive and included at a volume ratio of 15% or more and 50% or less with respect to the total of the first silver particles and the second silver particles.
2. The solid electrolytic capacitor according to claim 1 ,
wherein the inorganic particles are graphite, and
the inorganic particles are included at a volume ratio of 15% or more and 40% or less with respect to the total of the first silver particles and the second silver particles.
3. The solid electrolytic capacitor according to claim 1 ,
wherein a particle size distribution of the inorganic particles has a peak value lower than that of a particle size distribution of the second silver particles.
4. A solid electrolytic capacitor comprising:
a capacitor element having a base body composed of conductive material, a dielectric film formed on the base body, a solid electrolyte layer formed on the dielectric film, and a collector layer formed on the solid electrolyte layer and including at least a silver paste layer;
a first external terminal electrically connected to the base body; and
a second external terminal electrically connected to the collector layer,
wherein the silver paste layer includes:
first silver particles having a peak particle size of 150 nm or less;
second silver particles having a peak particle size of 500 nm or more; and
resin material,
wherein the first silver particles are particles obtained by surrounding inorganic particles as a core with a silver layer.