The energy storage devices are those which stores the energy generated for the future use. The energy can be generated in multiple ways: Mechanical, radiation, chemical, kinetic, gravitational and so on. For the energy to be stored, it is essential to convert it from the original complicated form to the convenient form. The Energy Materials are targeted on the design and improvement of high-performance materials for alternative energy technologies and developing a crucial understanding of their physical properties. Energy materials include fuel cells, batteries, photovoltaics, thermo-electrics, super-capacitors, hydrogen technologies, photo-catalysis, solar power technologies, magnetic refrigeration and piezoelectric materials.