Electrolyte and electrochemical device containing same

The invention belongs to the technical field of electrochemical devices, and particularly relates to an electrolyte and an electrochemical device containing the electrolyte, the electrolyte comprises an organic solvent, a lithium salt and a composite additive, the composite additive comprises a first additive and a second additive, the first additive is a compound with a chemical structural formula shown in the formula I, and the second additive is a compound with a chemical structural formula shown in the formula II; the second additive is a compound with a chemical structural formula as shown in a formula II. The electrolyte provided by the invention has high voltage resistance, can reduce side reaction under high voltage, avoids reaction with a positive electrode material, prolongs the cycle life of a lithium ion battery, and improves the high-temperature storage performance of the lithium ion battery. 本发明属于电化学装置技术领域，尤其涉及一种电解液及含有该电解液的电化学装置，包括有机溶剂、锂盐、复合添加剂，所述复合添加剂包括第一添加剂和第二添加剂，第一添加剂为具有式Ⅰ所示化学结构式的化合物，第二添加剂为具有