Si is one of the most promising anode materials for the next generation of lithium (Li) ion batteries (LIBs). Although various forms of nano Si and Si/C composite have been designed to minimize pulverization of Si, the stability of Si/C based anode is still limited by many other factors, especially the selection of electrolytes. Recently, we have developed localized high concentration electrolytes (LHCE) for Si based anode. It is found that the optimization of electrolytes for Si/C composite anode not only depends on the stability of electrolyte against Si, but also depends on the stability of electrolyte against binder and graphite used in the Si/C composite. Electrolyte additives also play an important role in the long-term stability of the Si based anode. In addition, electrolyte also need to be stable at high voltage conditions to enable high energy LIBs. This work will discuss various factors that affect the stability and safety of Si based LIBs and demonstrate highly stable electrolytes that lead to long term stability of silicon based high energy LIBs using commercial Si nano powder and graphite. The future directions on Si based LIBs will also be discussed.