Fig. 2. A schematic illustration of the working principles of a graphite/LiCoO2 lithium-ion battery (a) and a lithium–sulfur battery (b). The crystal structure of graphite, LiCoO2, Li metal and sulfur is also given at the corresponding positions. (c) The comparison of theoretical specific capacities of the LiCoO2 and S8 cathodes. (d) The comparison of theoretical energy densities of LIBs and LSBs.
