Non-aqueous electrolyte and high-voltage lithium battery containing same

The invention relates to a non-aqueous electrolyte and a high-voltage lithium battery containing the same. In order to solve the problems that the high-temperature performance and the discharge performance of an existing lithium battery containing the non-aqueous electrolyte are reduced along with voltage rise, and the safety is poor, the invention provides the non-aqueous electrolyte, the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive, the additive comprises a substance shown in a structural general formula and a boron-containing lithium salt, R1 and R2 are the same, and R1 and R2 are different from each other. And R1 and R2 are an alkylene group, a fluoroalkylene group, an alkyleneoxy group, or a fluoroalkyleneoxy group; r3 and R4 are the same, and R3 and R4 are hydrogen, alkyl, alkoxy, fluoroalkyl or fluoroalkoxy. The lithium battery still has excellent high-temperature performance and discharge performance when the voltage is increased to 4.5 V or even higher while th