Electrolyte solution, positive electrode, and lithium-ion battery comprising the electrolyte solution and/or the positive electrode

Abstract

An electrolyte solution, a positive electrode, and a lithium-ion battery containing the electrolyte solution and/or the positive electrode are provided. The electrolyte solution comprises a lithium salt, an electrolyte solvent, and an additive, wherein the additive is an aniline compound having a structure of Formula 1 or a derivative thereof: in which Rand Rare each independently selected from at least one of —H, —(CH)CH, and —(CH)CF, where 0≤n2≤3, and 0≤n2≤3; and M-Mare each independently selected from at least one of —H, —F, —Cl, —Br, —(CH)CH, and R—S—R, where 0≤n3≤3, and at least one of M-Mis selected from a thioether group R—S—R, where Ris selected from —(CH)—, in which 0≤n4≤1, and Ris selected from one or two of an aniline group or —(CH)CF, where 0≤n5≤3. By adopting the aniline compound having a structure of Formula 1 or a derivative thereof as a specific additive in the present invention, the positive electrode is protected from being damaged, and the electrolyte solvent is protected from being oxidized and decomposed at a high voltage, thereby increasing the service life of a battery at a high voltage.