"Supercapacitors have established their role as high power density device capable of storing energy for multiple cycles that are much higher in number compared to the batteries. This book outlines the fundamentals of charge storage mechanisms in different configurations of supercapacitor. It describes the supercapacitor related phenomena, state of art supercapacitor technologies, design and fabrication of electrodes, materials for the supercapacitor, macro-supercapacitor, planar supercapacitor, significance of electrode design, merits, demerits of current technologies and future directions. It also details related physics including prospective materials and electrode parameters. Features: Provides understanding of the device architecture, electrode design, and pros-cons of classical supercapacitors Explains material design in the context of electrochemical energy storage Covers state-of-the-art quantum supercapacitor and technological challenges Describes advanced version of supercapacitor devices describing macro-to-micro scale devices and applications at different scales Include details of challenges and outline of future designs This book aims at researchers, professionals in electronics, electrochemistry, energy storage engineering, chemical engineering, and materials science"--.