NOVELTY - An electroactive, conductive organic polymer is prepared by providing a dispersion of positively charged polymer and anion other than sulfide anion. The dispersion is treated with solution comprising water and sulfide anions. An electroactive, conductive organic polymer is separated from the liquid medium, and then dried.    USE - For preparing electroactive, conductive organic polymer for composite cathode of electrochemical lithium cell.    ADVANTAGE - The inventive method provides electroactive, conductive organic polymer that is non-corrosive in contact with metal current collector (i.e., comprising aluminum).    DETAILED DESCRIPTION - Preparation of electroactive, conductive organic polymer involves providing a dispersion of charged polymer and anion other than sulfide anion, in a liquid medium comprising water. The dispersion is treated with solution comprising water and sulfide anions, and a formed electroactive, conductive organic polymer is separated from the liquid medium. The separated polymer is dried to remove residual amount of liquid medium. The positively charged polymer is positively charged polypyrroles, polyanilines, polythiophenes, ((M(Sm)-x-)n)y polymers, or (M')p(((M(Sm)-x-)n)y)z polymers.    M' = nonconductive repeating units of polymer;    M = conductive repeating units of polymer;    n = 0-3;    y = 8-1000;    m = 3-200;    x = 0-2;    p = 2-20000;    z = 1-100    The number of (Sm)-x- moieties in the positively charged polymer is at least1; and z is at mostp.    INDEPENDENT CLAIMS are also included for    (A) a composite cathode comprising electroactive, conductive organic polymer, and conductive fillers;    (B) a method for preparing a composite cathode;    (C) an electrochemical cell comprising an electrolyte interposed between anode and composite cathode; and    (D) a method of forming an electrochemical cell. The conductive fillers can be conductive carbons, graphites, activated carbon fibers, carbon nanofibers, metal flakes, metal powders, metal fibers, carbon fabrics, metal mesh, electrically conductive polymers, or electrically conductive metal chalcogenides. The composite cathode is prepared by dispersing or suspending an electroactive, conductive organic polymer in a liquid medium, optionally adding a filler, mixing and casting the composition, and removing the liquid from the composition.