Sodium-ion battery electrolyte, preparation method thereof and sodium-ion battery

The invention discloses a sodium-ion battery electrolyte which comprises an organic solvent, a sodium salt and an additive, the additive comprises one or a combination of two of an ether additive and an organic silicon nitrile additive; and the structure of the organic silicon nitrile additive is shown as follows: # imgabs0 #. The preparation method has the beneficial effect that the technical problems of large expansion, increased impedance, gas production and the like in the cycle period of the existing sodium ion battery are solved. 本发明公开了一种钠离子电池电解液，包括有机溶剂、钠盐和添加剂；所述添加剂包括有醚类添加剂和有机硅腈类添加剂中一种或两种组合；所述有机硅腈类添加剂的结构如下所示：#imgabs0#本发明的有益效果是：解决现有钠离子电池存在循环期间膨胀大、阻抗增大、产气等技术问题。