Lithium ion low-temperature electrolyte and lithium ion battery

According to the technical scheme, the lithium-ion low-temperature electrolyte is characterized by comprising an ester solvent, an ether solvent, a lithium salt, a low-temperature additive and other functional additives, the low-temperature additive is 1-methyl-3-[(3-trimethoxysilyl)-propyl] imidazole bis (trifluoromethane sulfonamide), and the other functional additives are one or more of trimethoxy silyl)-propyl] imidazole bis (trifluoromethane sulfonamide). The low-temperature electrolyte for the lithium ion battery is prepared from the following components in percentage by weight: 60 to 85 percent of ester solvent and ether solvent, 5 to 10 percent of lithium salt and 0.5 to 4 percent of 1-methyl-3-[(3-trimethoxysilyl)-propyl] imidazole bis (trifluoromethane sulfonamide), and the sum of the contents of the components in the low-temperature electrolyte for the lithium ion battery is 100 percent. The lithium iron phosphate-graphite lithium ion battery has the technical effects that the low-temperature perfo