Ascorbic-acid-assisted recovery of cobalt and lithium from spent Li-ion batteries

• Published in: Journal of power sources 2012-11, Vol.218, p.21-27
• Main Authors: Li, Li, Lu, Jun, Ren, Yang, Zhang, Xiao Xiao, Chen, Ren Jie, Wu, Feng, Amine, Khalil
• Format: Article
• Language: English
• Subjects: Acid leaching; Applied sciences; Ascorbic acid; Batteries; Cathodes; Cathodic active material; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Leaching; Lithium; Lithium cobalt oxide; Lithium-ion batteries; Materials; Recovering; Spent Li-ion batteries
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2012.06.068

Recycling of the major components from spent Li-ion batteries (LIBs) is considered desirable to prevent environmental pollution and recycle valuable metals. The present work investigates a novel process for recovering Co and Li from the cathode materials (containing LiCoO2 and Al) by a combination of ultrasonic washing, calcination, and organic acid leaching. Copper can also be recovered from the anode materials after they are manually separated from the cathode. Ascorbic acid is chosen as both leaching reagent and reducing agent to improve the Co recovery efficiency. Leaching efficiencies as high as 94.8% for Co and 98.5% for Li are achieved with a 1.25 mol L−1 ascorbic acid solution, leaching temperature of 70 °C, leaching time of 20 min, and solid-to-liquid ratio of 25gL−1. The acid leaching reaction mechanism has been preliminarily studied based on the structure of ascorbic acid. This method is shown to offer an efficient way to recycle valuable materials from spent LIBs, and it can be scaled up for commercial application. ► We report an ultrasonic-assisted hydrometallurgical technique. ► Ascorbic acid is chosen as both leaching reagent and reducing agent. ► This technique avoids use of the traditional reducing agent H2O2. ► Leaching efficiencies are as high as 94.8% for Co and 98.5%. ► The acid leaching reaction mechanism has been preliminarily studied.