Water removal additive, electrolytic solution containing water removal additive and lithium ion battery

The invention discloses an application of a compound shown as a structural formula (I) as a water removal additive in an electrolytic solution, wherein the addition amount of the compound accounts for 0.001-5.0% of the total mass of the electrolytic solution, the water in the electrolytic solution can be effectively reduced, and no precipitate is generated in the storage process. The invention also discloses an electrolytic solution containing the compound shown in the structural formula (I) and a lithium ion battery, wherein the compound has a water removal effect in the electrolytic solution, also has a negative electrode film forming function, and can reduce electrode impedance so as to improve the first coulombic efficiency and low-temperature discharge performance of a battery core. 本发明公开了一种如结构式(I)所示的化合物作为除水添加剂在电解液中的应用，所述化合物的添加量占电解液总质量的0.001％～5.0％，能够有效降低电解液中的水分，且在存储过程中不产生沉淀。本发明还公开了包含结构式(I)所示化合物的电解液及锂离子电池，该化合物在电解液中具有除水效果的同时，还具备负极成膜功能，能降低电极阻抗，从而提升电芯首次库伦效率和低温放电性能。