NOVELTY - A battery comprises: a cathode comprising a material selected from high voltage phosphates, high voltage fluorophosphates, high voltage fluorosilicates, high voltage lithium-rich layered oxides, nickel-manganese cobalt (NMC)-type cathode material, and high voltage spinels, where the high voltage spinel is not an lithium manganese oxide (LMO)-type lithium manganese oxide (LiM2O4); and an electrolyte solution comprising a lithium salt, a solvent, and silanamine compound. The electrolyte solution is indicated by electrochemical stability when the battery is operated at voltages above 4.2V.    USE - As battery (claimed) for consumer electronics, portable electronics, hybrid vehicles, electrical vehicles, power tools, power grid, military applications, and aerospace applications.    ADVANTAGE - The battery retains at least 90% of its capacity after 100 cycles when cycled to voltages above 4.2 V; or retains at least 80% of its capacity after 200 cycles when cycled to voltages above 4.2 V.    DETAILED DESCRIPTION - A battery comprises: a cathode comprising a material selected from high voltage phosphates, high voltage fluorophosphates, high voltage fluorosilicates, high voltage Li-rich layered oxides, nickel-manganese cobalt (NMC)-type cathode material, and high voltage spinels, where the high voltage spinel is not an lithium manganese oxide (LMO)-type lithium manganese oxide (LiM2O4); and an electrolyte solution comprising a lithium salt, a solvent, and silanamine compound of formula R2-Si(R1)(R3)-N=X=N-Si(R4)(R6)-R5 (I). The electrolyte solution is indicated by electrochemical stability when the battery is operated at voltages above 4.2V.    R1-R6=1-20C alkyl groups, 1-20C alkenyl groups, 1-20C alkynyl groups, or 5-20C aryl groups (all optionally substituted);    X=3-20C alkyl groups, 2-20C alkenyl groups, 4-20C alkynyl groups (all optionally substituted) or carbon.    An INDEPENDENT CLAIM is included for a method of using a battery involving either charging a voltage above 4.2 V into the battery; or providing the cathode and electrolyte solution, forming the battery from the cathode and the electrolyte solution, and charging the battery.