Electrolyte and lithium ion battery containing same

An embodiment of the present application provides an electrolyte and a lithium ion battery comprising the same, the electrolyte comprising: a trinitrile compound of a general formula (I) in which R11,R12 and R13 are each independently selected from an alkylene group having 0 to 8 carbon atoms, and R11, R12 and R13 are not 0 at the same time; and a fluorosulfonylsilane acetate ester. According tothe application, the cycle performance, the rate capability and the floating charge performance of the lithium ion battery are improved through combined use of the trinitrile compound and the fluorosulfonylsilane acetate ester. 本申请的实施例提供了电解液和含有该电解液的锂离子电池，电解液包括：通式(I)的三腈化合物，在通式(I)中，R、R、R各自独立的选自碳原子数为0～8的亚烷基，且R、R、R不同时为0；以及氟代磺酰基硅烷乙酸酯。本申请通过将三腈化合物以及氟代磺酰基硅烷乙酸酯结合使用，提高了锂离子电池的循环性能、倍率性能和浮充性能。