Lithium-ion batteries are nowadays a mature technology for energy storage. However, some safety problems have been identified during their operation in high power applications such as fire incidents in electric vehicles. The most promising solution to improve the safety of lithium-ion batteries is replacing the current organic liquid based electrolytes with solid electrolytes. In this context, new solid electrolytes having chemical and electrochemical stability with high ionic conductivity need to be discovered. Therefore, in the present study, a new LGPS-type structural domain is highlighted for the Li-B-P-S system. Ionic conductivities of up to 10-4 S cm-1 have been achieved for prepared solid electrolytes in the Li-B-P-S system, and higher stability against lithium metal as compared to Li10GeP2S12. These solid electrolytes also show better electrochemical characteristics in all solid-state batteries.