Organic-inorganic films have been prepared. Electrodeposited polyacrylonitrile (PAN) and cobalt-tin films on titanium substrate are studied as a new electrode for lithium ion batteries. For the preparation of the electrode, firstly, cobalt and tin are electrodeposited on titanium substrate and an amorphous and metastable Co-Sn alloy is the main product. Secondly, PAN is deposited on the Co-Sn/Ti substrate through electropolymerization of the monomer (acrylonitrile). The interfacial properties of tin-based electrochemically active material are modified via electrodeposition of PAN, as is observed by using electrochemical impedance spectroscopy. Areal capacities in the order of mAh/cm(2) have been achieved. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.054207jes] All rights reserved.