NOVELTY - Battery comprises: an anode (102) comprising an anode active material having a first specific capacity; a cathode (106) comprising a cathode active material having a second specific capacity, where the first specific capacity and the second specific capacity are matched such that the battery has a rated charge voltage of greater than 4.2 V; and an electrolyte comprising a lithium salt, a non-aqueous solvent, and a silicon compound (I).    USE - The battery is useful to supply power for consumer electronics, portable electronics, hybrid vehicles, electrical vehicles, power tools, power grid, military applications and aerospace applications.    ADVANTAGE - The battery incorporating the electrolyte solutions including (I) has reduced resistance and a reduced resistance build-up during cycling, hence the battery is efficient to remove lithium ions from electrodes; has higher specific capacity and higher energy density, reduced hysteresis in a voltage profile between charging and discharging, where mitigation against temperature increase during cycling. The battery has high stability during battery cycling up to high temperatures, high voltages, high discharge capacity, high coulombic efficiency, and excellent retention of discharge capacity and coulombic efficiency over several cycles of charging and discharging.    DETAILED DESCRIPTION - Battery comprises: an anode (102) comprising an anode active material having a first specific capacity; a cathode (106) comprising a cathode active material having a second specific capacity, where the first specific capacity and the second specific capacity are matched such that the battery has a rated charge voltage of greater than 4.2 V; and an electrolyte comprising a lithium salt, a non-aqueous solvent and a silicon compound of formula (R2-Si(R1)(R3)-X-Y1) (I).    R1-R3 = 1-20C alkyl, 1-20C alkenyl, 1-20C alkynyl or 5-20C aryl (all optionally substituted);    X = N or O; and    Y1 = hydride, halo, hydroxy, thio, alkyl, alkenyl, alkynyl, aryl, iminyl, alkoxy, alkenoxy, alkynoxy, aryloxy, carboxy, alkylcarbonyloxy, alkenylcarbonyloxy, alkynylcarbonyloxy, arylcarbonyloxy, alkylthio, alkenylthio, alkynylthio, arylthio, cyano, N-substituted amino, alkylcarbonylamino, N-substituted alkylcarbonylamino, alkenylcarbonylamino, N-substituted alkenyl carbonylamino, alkynylcarbonyl amino, N-substituted alkynylcarbonylamino, arylcarbonylamino, N-substituted arylcarbonylamino, boron-containing groups, aluminum-containing groups, silicon-containing groups, phosphorus-containing groups or sulfur-containing groups.    INDEPENDENT CLAIMS are included for:    (1) an electrolyte solution for a high voltage battery, comprising a lithium salt, a non-aqueous solvent and (I), where the electrolyte solution has an electrochemical stability in a high voltage battery at voltages of above 4.2 V; and    (2) a method of making a high voltage battery, comprising providing the electrolyte solution, providing an anode comprising the anode active material, providing a cathode comprising the cathode active material, assembling the anode and cathode and optionally a separator into an electrochemical cell, adding the electrolyte solution to the cell, and sealing the cell to form the high voltage battery.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of lithium-ion battery.    Lithium-ion battery (100)    Anode (102)    High volatage electolyte (104)    Cathode (106)    Separator. (108)