Li metal batteries (LMBs) have been revived as promising rechargeable battery chemistry in the last few years due to their high potential energy densities. However, there is still a long way to go for commercialization of LMBs because of the limited cycle life and potential safety concerns of LMBs, which are caused by the formation of high surface (porous) Li and low Coulombic efficiency (CE) during repeated charge/discharge processes. Developing advanced electrolytes is crucial to develop practical LMBs with high energy density. In this work, we report a promising electrolyte approach based on the use of a new electrolyte solvent, which can be worked as the diluent for high concentrated electrolyte (HCE) to get a localized high concentrated electrolyte (LHCE). Although with an apparent salt concentration of 1M, this electrolyte generates salt decomposition dominant solid electrolyte interphases (SEIs) on Li metal anode, which is robust and conductive. Therefore, it shows high Li Coulombic efficiency and great stability in Li||NMC811 cells. The details together with post-cycling analysis will be discussed at the presentation.