Electrolyte for low-temperature lithium ion battery electrolyte and lithium ion battery

The invention belongs to the technical field of lithium ion batteries. The invention discloses a low-temperature lithium ion battery electrolyte which is composed of a solvent, a lithium salt and an additive, the lithium salt is a mixed lithium salt and comprises at least one of lithium hexafluorophosphate or lithium tetrafluoroborate and a special lithium salt, and the special lithium salt is composed of at least one of lithium bis (oxalato) phosphate, lithium bis (fluorosulfonyl) imide or lithium difluorophosphate; and the weight percentage of the special lithium salt in the electrolyte is 0.5%-5.0%. The invention also discloses an electrolyte containing the low-temperature lithium ion battery electrolyte. Through necessary and selective addition and combination of the components, the purpose of the invention can be achieved, the low-temperature performance of the electrolyte is synergistically improved, the high-temperature performance is not lost, the application temperature range of the lithium ion batte