▎ 摘　　要

NOVELTY - A lithium-ion battery electrolyte comprises a lithium salt, solvent, additive A and additive B. The additive A is selected from at least one fluorophenyl difluorophosphate compounds (I), and additive B is selected from at least one of the isocyanurate compounds (II). USE - Electrolyte is used in preparation of lithium-ion battery (claimed). ADVANTAGE - The additives of the electrolyte, contain fluorophenyl difluorophosphate and unsaturated isocyanurate, where the combined use of the two additives, protects the positive terminal, such that the battery impedance does not increase significantly, ensuring the high-temperature storage stability of the battery, without deteriorating the battery cycle performance. DETAILED DESCRIPTION - A lithium-ion battery electrolyte comprises a lithium salt, solvent, additive A and additive B. The additive A is selected from at least one fluorophenyl difluorophosphate compounds of formula (I), and additive B is selected from at least one of the isocyanurate compounds of formula (II). In formula (I), n =1-5. In formula (II), R1, R2, R3 = fluorine atom; 1-10C alkyl, 2-10C alkenyl, 2-10C alkynyl, 1-10C alkoxy, 1-10C fluoroalkyl, 1-10C fluoroalkoxy, 2-10C cyanoalkyl, 2-10C isocyanatoalkyl, provided at least one of R1, R2 and R3 contains an unsaturated bond. An INDEPENDENT CLAIM is included for lithium-ion battery which comprises anode sheet, cathode sheet, diaphragm and the electrolyte. The anode sheet comprises an anode current collector, anode active material, a conductive agent and a binder. The cathode sheet comprises a cathode current collector, cathode active material, a conductive agent and a binder. Further, the anode active material is lithium nickel cobalt compound (LiNi1-x-y-z CoxMnyAlzO2, where x=0-1, y=0-1, z= 0-1 and x+y+z= 0-1. The cathode active material is artificial graphite, natural graphite, composite graphite, graphene, intermediate of phase microspheres, nano-silicon, silicon-carbon composite materials and/or silicon oxide/carbon composite materials.