Sustainable Mining and Metallurgy

With the rapid development of electronic products and electric vehicles, spent lithium-ion batteries grow rapidly. At present, most of the research focuses on the recovery of the positive and negative materials of spent lithium ion batteries, while ignoring the recovery and utilization of the electrolyte. Organic solvents and lithium salts in electrolyte have high recovery value. This paper summarized the principle and application of current recovery and treatment methods of spent lithium-ion battery electrolyte, including high-temperature thermolysis, distillation-condensation method, chemical method and supercritical CO₂ extraction method, compared the advantages and disadvantages of different recovery methods, and look forward to the development direction of electrolyte recovery process.