NOVELTY - A battery comprises: an electrolyte (40), activating at least one anode (34) and cathode (42); and at least one of the anode comprising at least one component selected from lithium metal, lithium metal alloy or lithium metal intermetallic compound. The electrolyte comprises at least one organoborate salt in a solvent comprising at least one component selected from siloxane and silane.    USE - As battery (claimed) e.g. high-energy and long cycle life lithium secondary batteries, satellite applications, and biomedical devices such as defibrillators; in electrochemical devices.    ADVANTAGE - The battery suppresses the formation of dendrites on electrodes that include lithium metal; and provided more stable passivation layer formed on the anode, than the passivation layers that are formed by traditional electrolytes. The stability of the passivation layer plays a role in suppressing dendrite formation. Because dendrite formation is suppressed, the battery can retain the enhanced energy density of a lithium metal anode. The solvent comprising siloxane can yield an electrolyte with a lower viscosity than electrolytes that include similarly structured polysiloxanes. The reduced viscosity can increase the conductivity of the electrolyte and 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. The solvent comprising silanes has viscosity that is reduced even relative to similarly structured polysiloxanes, tetrasiloxanes, trisiloxanes or disiloxanes. The additional reduction in viscosity can further increase the conductivity of the electrolyte and improve wetting of electrodes in an electrochemical device enough to further increase the capacity and cycling properties of batteries. Thus, the cycling performance of the battery can be enhanced by the siloxanes and silanes in the solvent and by the passivation layer stability.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the battery involving generating an electrolyte having at least one mono(bidentate)borate salt in a solvent comprising siloxane or silane, and activating the anode and the cathode with the electrolyte.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view of a battery.    Battery (22)    Anode (34)    Electrolyte (40)    Cathode (42)    Separator (46)    Cathode medium (48)    Cathode substrate (50)    Anode medium (52)    Anode substrate (54)