Abstract: The invention discloses lithium ion secondary battery electrolyte and a lithium ion battery containing the electrolyte. The electrolyte is prepared from the components in percentage by weight in a non-aqueous solvent: 0.5-20 percent of dialkyl pyrocarbonate derivative, 0.1-20 percent of annular ether compound and 0.1-20 percent of borate lithium salt additive, wherein a structural formula of the dialkyl pyrocarbonate derivative is shown in the specification, and R1 and R2 are one, two or more of alkyl, alkenyl, halogenated alkyl, aryl, aromatic group containing halogen substituent, and oxygen-containing group. With the adoption of the lithium ion secondary battery electrolyte, the dialkyl pyrocarbonate derivative and the annular ether compound are added in the electrolyte, the lithium ion secondary battery electrolyte containing the borate lithium salt additive can be improved; when the lithium ion battery is charged firstly, a stable, dense and flexible SEI (Solid Electrolyte Interference) film can be formed, and the low-temperature discharge performance and the circulation performance of the electrolyte are improved.
|