Electrolyte for improving electrochemical performance of oxide layered positive electrode and application of electrolyte in sodium-ion battery

The invention belongs to the technical field of sodium ion batteries, and mainly relates to an electrolyte for improving the electrochemical performance of an oxide layered positive electrode, the electrolyte comprises an organic solvent, a sodium salt and an electrolyte additive glutaric anhydride as shown in a structural formula I, and further comprises an auxiliary additive fluoroethylene carbonate. The invention aims to design and develop an electrolyte system capable of forming a more stable CEI film on the surface of an oxide layered positive electrode aiming at the poor cycling stability of the existing sodium-ion battery, so that the electrochemical performance of the sodium-ion battery is improved. # imgabs0 # 本发明属于钠离子电池技术领域，主要涉及一种用于提高氧化物层状正极电化学性能的电解液，包含有机溶剂、钠盐和如结构式Ⅰ的电解液添加剂戊二酸酐，还包括辅助添加剂氟代碳酸乙烯酯。本发明的目的是针对现有钠离子电池循环稳定性不佳，设计开发了能够在氧化物层状正极表面形成更稳定CEI膜的电解液体系，进而提升了钠离子电池的电化学性能。#imgabs0#