Supercapacitors have attracted considerable attention owing to their high power density, long cycle-life, short charging time, and safe operation for promising applications to overcome limited supplies of energy and environmental problems. Supercapacitors are designed to bridge the gap between batteries and capacitors, and to form fast-charging energy-storage devices for intermediate, specific energy. The supercapacitor is an important device in energy-storage and energy-conversion systems, and is used in electric vehicles, uninterruptible power supplies, as well as memory protection for computer electronics and mobile phones. This book aids understanding of the basic technology and nanostructure of conducting polymers and their composites, which are emerging as novel fields of research and development for 'smart' materials (especially supercapacitors). Concepts of supercapacitors are explained clearly and concisely. This book is oriented around chemical engineering, so professionals involved in polymer science may find this book suitable for their advanced and applied field of research. This book will provide such professionals the opportunity to learn about conducting polymers and nanocomposites, as well as their production and processing technology for supercapacitors. Attention is focused mainly on the preparation of conducting polymer-based binary and ternary nanocomposites and their electrochemical performances for supercapacitor application. Nevertheless, this book will be a valuable reference for scientists, engineers, and students interested in the investigation and exploitation of a fascinating new class of conducting polymer nanocomposites.