Doping other ions into the Li2S crystal structure has been researched and tested to increase the ionic conductivity of Li2S. From there, it can be applied to lithium-sulfur batteries. From there, I deeply researched the XRD and EIS results of solid solutions of Li2S with Al2S3, AlI3, CaS, and MgS to see the structural changes of Li2S when doped and the movement of Li ions. I received the results that when doping AlI3, the solid solution brought a large ionic conductivity compared to the remaining solid solutions. The activation energy of the solid solution has decreased by 3.5 - 4 times (depending on the doping concentration) compared to the original Li2S. I have also shown the movement model of Li ions in the crystal structure and calculated the smallest ion jump. Furthermore, during my research, I also discovered that the electron conductivity of Li2S increased when doping with AlI3. The bandgap energy has decreased obviously after doping, in theory the doped Li2S can become a semiconductor. The above results can support future research to turn Li2S into a semiconductor and apply it to lithium-sulfur battery systems.