A porous metal foil and porous metal wire are described. Capacitor anodes made from either or both of the porous metal foil and porous metal wire are further described as well as methods to make same.

An improved electrolytic capacitor, and method of making the electrolytic capacitor, is provided. The electrolytic capacitor comprises an anode comprising a dielectric layer on the anode. A primary conductive polymer layer is on dielectric and a mordant layer on the primary conductive layer wherein the mordant layer comprises a mordant compound of Formula A; ##STR00001##
wherein:
each of R.sup.1-R.sup.6 is independently selected from H and —PO(OR.sup.7).sub.2 wherein each R.sup.7 is independently selected from H, substituted or unsubstituted alkyl of 1-20 carbons, substituted or unsubstituted aryl of 6-20 carbons or an alkylaryl of 7-21 carbons; with the proviso that at least one of R.sup.1-R.sup.6 is —PO(OH).sub.2. A secondary conductive polymer layer is on the mordant layer.

A tantalum powder, a tantalum powder compact, a tantalum powder sintered body, a tantalum anode, an electrolytic capacitor and a preparation method for tantalum powder. The tantalum powder contains boron element, and the tantalum powder has a specific surface area of greater than or equal to 4 m.sup.2/g; the ratio of the boron content of the tantalum powder to the specific surface area of the tantalum powder is 2˜16; the boron content is measured in weight ppm, and the specific surface area is measured in m.sup.2/g; Powder that can pass through a ρ-mesh screen in the tantalum powder accounts for over 85% of the total weight of the tantalum powder, where ρ=150˜170; and the tantalum powder with high CV has a low leakage current and dielectric loss, and good moldability.

A tantalum powder, a tantalum powder compact, a tantalum powder sintered body, a tantalum anode, an electrolytic capacitor and a preparation method for tantalum powder. The tantalum powder contains boron element, and the tantalum powder has a specific surface area of greater than or equal to 4 m.sup.2/g; the ratio of the boron content of the tantalum powder to the specific surface area of the tantalum powder is 2˜16; the boron content is measured in weight ppm, and the specific surface area is measured in m.sup.2/g; Powder that can pass through a ρ-mesh screen in the tantalum powder accounts for over 85% of the total weight of the tantalum powder, where ρ=150˜170; and the tantalum powder with high CV has a low leakage current and dielectric loss, and good moldability.

A solid electrolyte capacitor includes a sintered body formed by sintering a molded body containing a metal powder; and a solid electrolyte layer disposed on the sintered body, wherein the solid electrolyte layer includes a first layer containing an electrolytic polymerization conductive polymer disposed on the sintered body and a second layer containing a chemical polymerization conductive polymer disposed on the first layer.

A solid electrolyte capacitor includes a sintered body formed by sintering a molded body containing a metal powder; and a solid electrolyte layer disposed on the sintered body, wherein the solid electrolyte layer includes a first layer containing an electrolytic polymerization conductive polymer disposed on the sintered body and a second layer containing a chemical polymerization conductive polymer disposed on the first layer.

A solid electrolyte capacitor includes a sintered body formed by sintering a molded body containing metal powder; and a conductive polymer layer disposed above the sintered body. A ratio (t2/t1) of a thickness (t2) of the conductive polymer layer in an edge portion of the sintered body to a thickness (t1) of the conductive polymer layer in a central portion of the sintered body satisfies 0.35≤t2/t1≤0.9.

A solid electrolyte capacitor includes a sintered body formed by sintering a molded body containing metal powder; and a conductive polymer layer disposed above the sintered body. A ratio (t2/t1) of a thickness (t2) of the conductive polymer layer in an edge portion of the sintered body to a thickness (t1) of the conductive polymer layer in a central portion of the sintered body satisfies 0.35≤t2/t1≤0.9.

An electrolytic capacitor includes a capacitor element. The capacitor element includes an electrode group including an anode body, a cathode body, a separator, and an electrolyte layer. The anode body and the cathode body each has a foil shape. The anode body has a dielectric layer on a surface of the anode body. The electrolyte layer is in contact with the anode body, the cathode body, and the separator. The electrolyte layer contains a conductive polymer and a hydroxyl group-containing compound having a melting point of 50° C. or higher. The hydroxyl group-containing compound is at least one compound selected from the group consisting of a sugar and a polyhydric alcohol. The hydroxyl group-containing compound is unevenly distributed more in a peripheral portion of the capacitor element than in a central portion of the capacitor element.

An electrolytic capacitor includes a capacitor element. The capacitor element includes an electrode group including an anode body, a cathode body, a separator, and an electrolyte layer. The anode body and the cathode body each has a foil shape. The anode body has a dielectric layer on a surface of the anode body. The electrolyte layer is in contact with the anode body, the cathode body, and the separator. The electrolyte layer contains a conductive polymer and a hydroxyl group-containing compound having a melting point of 50° C. or higher. The hydroxyl group-containing compound is at least one compound selected from the group consisting of a sugar and a polyhydric alcohol. The hydroxyl group-containing compound is unevenly distributed more in a peripheral portion of the capacitor element than in a central portion of the capacitor element.