Solid electrolyte capacitor element, solid electrolyte capacitor, and carbon paste for solid electrolyte capacitor element
A solid electrolytic capacitor element includes an anode body; a dielectric layer formed on a surface of the anode body; a solid electrolyte layer that covers at least a portion of the dielectric layer; and a carbon layer that covers at least a portion of the solid electrolyte layer and contains carbon particles. The carbon layer shows a D/G ratio of 1.5 or less, the D/G ratio being a ratio of an intensity of a D band relative to an intensity of a G band in a Raman spectrum of the carbon layer.
1 . A solid electrolytic capacitor element comprising:
an anode body;
a dielectric layer formed on a surface of the anode body;
a solid electrolyte layer that covers at least a portion of the dielectric layer; and
a carbon layer that covers at least a portion of the solid electrolyte layer and contains carbon particles,
wherein the carbon layer shows a D/G ratio of 1.5 or less, the D/G ratio being a ratio of an intensity of a D band relative to an intensity of a G band in a Raman spectrum of the carbon layer;
the carbon particles have an average particle size D50 of 0.1 μm or more and 10 μm or less; and
the carbon layer contains a cellulose resin having a carboxy group or a salt thereof.
2 . The solid electrolytic capacitor element in accordance with claim 1 ,
wherein the D/G ratio is 1 or less.
3 . The solid electrolytic capacitor element in accordance with claim 1 ,
wherein the carbon particles include flake-shaped particles.
4 . A solid electrolytic capacitor comprising at least one of the solid electrolytic capacitor elements in accordance with claim 1 , and a resin outer housing made of an insulating resin around the at least one of the solid electrolytic capacitor elements.
5 . The solid electrolytic capacitor element in accordance with claim 1 ,
wherein the cellulose resin includes carboxymethyl cellulose (CMC).
6 . A carbon paste for a solid electrolytic capacitor element that is used to form a carbon layer included in the solid electrolytic capacitor element, the carbon paste comprising: carbon particles; and a dispersion medium,
wherein a dried coating film formed using the carbon paste shows a D/G ratio of 1.5 or less, the D/G ratio being a ratio of an intensity of a D band relative to an intensity of a G band in a Raman spectrum of the dried coating film;
the carbon particles have an average particle size D50 of 0.1 μm or more and 10 μm or less; and
the carbon layer contains a cellulose resin having a carboxy group or a salt thereof.