Lithium ion battery electrolyte and lithium ion battery containing same

The invention relates to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. In order to solve the problem that the existing lithium ion battery electrolyte cannot give consideration to cycle performance and high-temperature performance under a high-voltage condition at the same time, the invention provides the lithium ion battery electrolyte which comprises a non-aqueous organic solvent, a lithium salt and an additive, the additive comprises a silicon-nitrogen compound and selectively comprises an azacyclo-boron trifluoride coordination compound, and the silicon-nitrogen compound used in the electrolyte can improve the generation of HF in the storage process of the electrolyte and can improve the oxidation resistance of the electrolyte under a high-voltage condition; and the azacyclo-boron trifluoride coordination compound can improve the solubility of LiF in a positive electrode solid surface film and reduce the impedance of a solid interface film, and the cycle performan