Non-aqueous electrolyte for improving high and low temperature performance and lithium ion battery

The invention discloses a non-aqueous electrolyte capable of improving high and low temperature performance and a lithium ion battery, the electrolyte comprises a main lithium salt, an organic solvent, lithium difluorophosphate and a compound shown as a formula (I): # imgabs0 # in the electrolyte, the lithium difluorophosphate and the compound shown as the formula (I) respectively account for a% and b% of the total mass of the electrolyte, and the following relational expressions are met: a + b is more than or equal to 0.1 and less than or equal to 5.5; 0.05 < = a/b < = 10. The electrolyte can improve the normal-temperature and high-temperature cycle performance and high-temperature storage performance of the battery, and meanwhile, the low-temperature discharge performance of the battery is improved. 本发明公开了一种提升高低温性能的非水电解液及锂离子电池，所述电解液包括主锂盐、有机溶剂，以及二氟磷酸锂和式(I)所示化合物：#imgabs0#在电解液中，二氟磷酸锂和式(I)所示化合物分别占电解液总质量的a％与b％，且符合下述关系式：0.1≤a+b≤5.5；0.05≤a/b≤10。本发明电解液可以改善电池的常温、高温循环性能及高温存储性能，同时提升电池的低温放电性能。