Solid electrolytic capacitor with interlayer crosslinking

A method for preparing a solid electrolytic capacitor and an improved solid electrolytic capacitor are provided. The method includes providing an anode, forming a dielectric (18) on the anode and forming a cathode (20) on the dielectric wherein the cathode comprises interlayers (201, 202, 203, 204). At least one interlayer comprises a monomer, oligomer or polymer with multifunctional or multiple reactive groups and an adjacent layer comprises a molecule with crosslinkable functionality. The oligomer or polymer with multifunctional or multiple reactive groups of one layer reacts (26) with the crosslinkable functionality in the adjacent layer.