Polymer material should have stability and reversibility during the electrode reactions in the secondary batteries. Electrochemical properties of deeply Li-doped polyacenic semiconductor (PAS) material have been investiganted. PAS material prepared from phenol resin at relatively low temperature (550℃∼750℃) can be doped by a much larger amount of lithium atoms up to the C₂Li state compared with graphite(C₆Li state) without any Li-metal electrolysis. We prepared each polyacenic materials as an electrode under various temperatures and mixed it with ketjen black in various ratio. The PAS electrode has been confirmed to show good stability and reversibility.