Several conductive polymers (polyacetylene, polypyrrole, polythiophene, polyiminodibenzyl, polycarbazole, polyfuran, polyphenothiazine) have been synthesized by a chemical polymerization method and examined for their suitability as positive electrode material for lithium secondary batteries. A test cell, using polypyrrole as a positive electrode, showed good charge/discharge characteristics. Oxidizing agents for the synthesis of polypyrrole have been investigated for further improvement, and polypyrrole prepared by a new method of synthesis using a Cu(BF4)2/nitrile system exhibited excellent performance.