The demands for advanced energy storage devices have dramatically increased during the past years. They are fostered by a variety of different needs in multiple grids and off-grid technologies. Today, lithium-ion batteries (LIBs) serve as power sources in portable electronics, power tools, and electric base transportation. They are also ready to take over other niche and mainstream applications, e.g. wearable to smart grid support and electric vehicles. Although LIBs are the critical enabler of the current success of mobile devices, they are quickly becoming one of the major bottlenecks. The battery technology has been unable to keep pace. The next battery generation requires a combination of high energy and power densities, longer cycling life, and reduced costs. To fulfill this necessity, new materials are needed to develop. For example the proposed Li2S cathode material, which means not metallic Li will be needed as anode and would allow the use of conversion electrodes, i.e. Si, improving the safety of the device, which is crucial for several applications. In addition, the manufactured Li2S positive electrode has a much higher melting point (1372 °C) than the conventional S (115 °C), guaranteeing its use in high-temperature applications.