Solid Electrolytic Capacitor Containing An Intrinsically Conductive Polymer

A solid electrolytic capacitor comprising a capacitor element, wherein the capacitor element comprises:

• a sintered porous anode body;
• a dielectric that overlies the anode body;
• a solid electrolyte that overlies the dielectric, wherein the solid electrolyte includes a conductive polymer containing repeating thiophene units of the following general formula (1) and/or (2):
• wherein,
• X1 and X2 are independently hydrogen, an optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkylene oxide, optionally substituted thiocyano, optionally substituted thioalkyl, or optionally substituted amino, or wherein X1 and X2 are combined to form an optionally substituted alkylenedioxy or an optionally substituted alkylenedithio group;
• and
• R is an optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkylene oxide, optionally substituted aryl optionally substituted heterocyclyl, optionally substituted condensed ring group, or a salt or acid of any of the foregoing;
• and
• an external polymer coating that overlies the solid electrolyte and includes conductive polymer particles.