The present book entitled PVP based polymer electrolyte films for solid state battery applications deals with the investigations on structural, electrical, optical properties and electro chemical cell applications. During the last four decades, solid state ions has emerged as one of the major interdisciplinary fields of physics, chemistry, material science, engineering and technology. It deals with ionic solids, which exhibit high ionic conductivity is called super ionic conductors or fast ion conductors. These are also called as solid electrolytes, since they exhibit ionic conductivity...