The conductive polymer precursor, 3-hexylthiophene (3-HT), is successfully encapsulated in ca. 5 mu m polyamide microcapsules by interfacial polymerization. The microcapsules are thermally stable up to 300 degrees C, and electrochemically stable in a Li-ion battery electrolyte. Mechanical rupture of the microcapsules releases the liquid core and electropolymerization of the 3-HT monomer was analyzed using cyclic voltammetry. Scanning electron microscopy and vibrational (Raman) spectroscopy confirm the presence of newly formed poly(3-HT) thin films on model electrode surfaces. Encapsulation of battery additives such as 3-HT in microcapsules that remain latent and stable in the electrolyte until requiredmay lead to enhanced battery performance and extended battery lifetimes. (C) 2014 The Electrochemical Society. All rights reserved.