Polythiophene (Pth) powder with chemical polymerization has been prepared and the electrochemical properties of Li//Pth cell with variable contents of conductor and applied currents are investigated. This system has a plateau region around redox peaks position and is increased and decreased sharply below similar to3 V during charge and discharge processes. The charge and discharge profiles of Li//Pth cell are similar with the case of transition metal oxide electrode. Although the specific capacity of Li//Pth system is relatively small, this system can be suitable in the power source device for high voltage since the average voltage is above similar to3.6 V. (C) 2004 Elsevier B.V. All rights reserved.