NOVELTY - Battery comprises: an anode comprising an anode active material comprising a first specific capacity; a cathode comprising a cathode active material having second specific capacity, where the first and 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 silicon compound (I).    USE - The battery is useful for supplying power for consumer electronics, portable electronics, hybrid vehicles, electrical vehicles, power tools, power grid, military applications, and aerospace applications.    ADVANTAGE - The battery: exhibits coulombic efficiency of at least 90% at 100 cycles from an initial cycle, when battery is operated in an environment at greater than or equal to 50 degrees C (claimed); and utilizes materials for electrolytes that exhibit high stability during battery cycling up to high temperatures high voltages, high discharge capacity, and excellent retention of discharge capacity and coulombic efficiency over several cycles of charging and discharging.    DETAILED DESCRIPTION - Battery comprises: an anode comprising an anode active material comprising a first specific capacity; a cathode comprising a cathode active material having second specific capacity, where the first and 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 silicon compound of formula (I).    R1-R3 = 1-20C alkyl, 1-20C alkenyl, 1-20C alkynyl or 5-20C aryl (all optionally substituted);    X1 = N or O; and    Y1 = hydride, halo, OH, thio, alkyl, alkenyl, alkynyl, aryl, iminyl, alkoxy, alkenoxy, alkynoxy, aryloxy, carboxy, alkylcarbonyloxy, alkenylcarbonyloxy, alkynylcarbonyloxy, arylcarbonyloxy, alkylthio, alkenylthio, alkynylthio, arylthio, CN, N-substituted amino, alkylcarbonylamino, N-substituted alkylcarbonylamino, alkenyl carbonylamino, N-substituted alkenyl carbonylamino, alkynyl carbonyl amino, N-substituted alkynyl carbonylamino, arylcarbonylamino, N-substituted arylcarbonylamino, B-containing groups, Al-containing groups, Si-containing groups, P-containing groups or S-containing groups.    INDEPENDENT CLAIMS are also 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 electrochemical stability in a high voltage battery at voltages above 4.2 V; and    (2) making the high voltage battery, comprising: providing the electrolyte solution; providing the anode; providing a cathode; 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.