Low-temperature electrolyte, low-temperature lithium ion battery and preparation method of low-temperature lithium ion battery

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a low-temperature lithium ion battery electrolyte, a low-temperature lithium ion battery and a preparation method of the low-temperature lithium ion battery electrolyte, and the low-temperature lithium ion battery electrolyte comprises an electrolyte solvent, lithium bis (fluorosulfonyl) imide, lithium difluoro (oxalato) borate, fluoroethylene carbonate, lithium difluorophosphate and ethylene sulfate. The invention provides a low-temperature lithium ion battery electrolyte for improving the low-temperature charge-discharge performance of a lithium ion battery, the low-temperature lithium ion battery and a preparation method of the low-temperature lithium ion battery. 本发明属于锂离子电池技术领域，尤其涉及一种低温锂离子电池电解液、低温锂离子电池及其制备方法，所述低温锂离子电池电解液包括电解液溶剂，双氟磺酰亚胺锂，二氟草酸硼酸锂，氟代碳酸乙烯酯，二氟磷酸锂和硫酸乙烯酯。本发明提供一种提升锂离子电池低温充放电性能的低温锂离子电池电解液、低温锂离子电池及其制备方法。