Batteries are essential components of most electrical devices. They are used as the power source in cars, laptops, smartphones, and other electronic appliances storing and generating electricity. Continuous effort and research take place in order to improve commercial batteries making them more efficient and affordable. The main priority of research projects and battery technology development has been, in the past recent years, to increase the energy density of lithium batteries. The goal is to meet the growing demand for mobile devices, which increasingly need more energy, and to increase the autonomy of second-generation electric vehicles, which demand higher capacity and more efficient batteries.