The invention discloses an
electrolyte of a high-
voltage fast-charging
lithium ion battery and the
lithium battery. The
electrolyte comprises a non-aqueous
organic solvent, an
electrolyte salt and anadditive, and the
mass percentages of the non-aqueous
organic solvent, the electrolyte salt and the additive in the electrolyte are 65%-90%, 10%-20% and 0-15% respectively. The electrolyte can improvethe normal-temperature quick
charge cycle performance, the high-temperature storage performance and the low-temperature
discharge performance of the high-
voltage battery at the same time. The lithiumion battery prepared by adopting the electrolyte has lower surface density, is beneficial to reducing the impedance of the
lithium ion battery, is smoother in lithium
ion migration, can effectively improve the rate charge-
discharge performance, and obviously improves the low-temperature
discharge performance at the same time; the electrolyte of the high-
voltage fast-charging
lithium ion battery has the relatively high charging
cut-off voltage, the capacity of the
lithium ion battery can be improved by about 15%, and
energy density reduction caused by surface
density reduction is made up; andcompared with a conventional battery, the
lithium ion battery has wider tabs, so that the ohmic impedance of the lithium ion battery is effectively reduced to facilitate
electron transmission.