NOVELTY - An electrochemical device comprises an electrolyte including at least one salt and a silane having a silicon linked to at least one substituent that each include a poly(alkylene oxide) moiety or a cyclic carbonate moiety.    USE - As an electrochemical device including lithium secondary battery (claimed), such as biomedical devices, electrical vehicles and satellite applications.    ADVANTAGE - The electrochemical device provides high-energy and long cycle life lithium secondary batteries with improved safety and performance. The silane compound can yield an electrolyte with a lower viscosity, than siloxane based electrolytes. The reduced viscosity can improve wetting of electrodes in an electrochemical device enough to enhance the homogeneity of the electrolyte distribution in the cell. The enhanced homogeneity can be sufficient to increase the capacity and cycling properties of batteries. When the device is repeatedly cycled at 3-4 V using a charge and discharge rate of C/10 (0.2 mA) after formation of a passivation layer on the anode, these electrolytes can provide a secondary battery having a discharge capacity retention greater than 90 (preferably greater than 95)% at cycle number 35, or a discharge capacity retention greater than 99% at cycle number 50. The use of electrolytes having high ionic conductivity (i.e. greater than 1x 10-3 S/cm at 37 degrees C) enhances capacity and cycling properties of the devices.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) forming an electrochemical device, involving generating an electrolyte including at least one salt and a silane having a silicon linked to at least one first substituent that includes poly(alkylene oxide) moiety or cyclic carbonate moiety; and activating at least one anode and at least one cathode with the electrolyte; and    (2) generating a silane, involving generating a precursor solution that includes a precursor silane having a silicon linked directly to at least one substituent that includes a halogen, and a primary substituent precursor selected from a salt of an alcohol that includes a poly(alkylene oxide) moiety, an alcohol that includes a poly(alkylene oxide) moiety, a salt of an alcohol that includes a cyclic carbonate moiety, or a primary substituent precursor that includes a tosylate and a poly(alkylene oxide) moiety or a cyclic carbonate moiety, and an alcohol that includes a cyclic carbonate moiety; and reacting the precursor silane and the primary substituent precursor in the precursor solution such that a silane is formed with the silicon linked to at least one substituent that each include a poly(alkylene oxide) moiety or a cyclic carbonate moiety.