NON-AQUEOUS ELECTROLYTE SOLUTION AND HIGH-VOLTAGE LITHIUM BATTERY CONTAINING SAME

A non-aqueous electrolyte and a high-voltage lithium battery comprising the same. In order to solve the problem that the high-temperature performance and discharge performance of the existing lithium batteries including non-aqueous electrolyte decreases with the increase of voltage, and the safety is not good, a non-aqueous electrolyte including a lithium salt, an organic solvent, and additives, the additives include a substance represented by the structural general formulawherein, R1 and R2 are the same, and R1 and R2 are alkylene, fluoroalkylene, alkyleneoxy, or fluoroalkyleneoxy; R3 and R4 are the same, and R3 and R4 are hydrogen, alkyl, alkyloxy, fluoroalkyl or fluoroalkyloxy, is provided. It ensures the high-temperature performance and cycling performance of lithium battery under conventional voltage, and meanwhile, when the voltage is increased to 4.5 V or even higher, the lithium battery still have excellent high-temperature performance and discharge performance, which ensures the safety and electrochemical performance.