Recycling of LiNi_(0.5)Co_(0.2)Mn_(0.3)O2 Material from Spent Lithium-ion Batteries Using Mixed Organic Acid Leaching and Sol-gel Method

摘要

A novel closed-loop recycling system of mixed organic acid leaching and sol-gel method re-synthesis for LiNi_(0.5)Co_(0.2)Mn_(0.3)O2 cathode material is designed.Mixed organic acid solution consisting of 0.4 mol/L DL-malic acid and 0.1 mol/L ascorbic acid was applied to the leaching procedure.Under optimal conditions(temperature: 70℃,time: 30 min,slurry density: 20 g/L),the leaching efficiency of Li,Ni,Co,and Mn is 99.06%,97.11%,96.46%,and 97.22%,respectively.DL-malic acid has a stronger chelate tendency with metal ions in the mixed acid leachate,which is verified by the UV-Vis spectra and FT-IR spectra.Without adding extra chelating reagents to the leachate,LiNi_(0.5)Co_(0.2)Mn_(0.3)O2 material is regenerated by the solgel method directly.Electrochemical performances of the resynthesized LiNi_(0.5)Co_(0.2)Mn_(0.3)O2 material exhibit an excellent initial charge and discharge capacity of 156.0 mAhg~(-1)and 145.2 mAhg~(-1)at 0.2 C,respectively.As an alternative to LIBs recovery,the advantages of this recovery method are low reagents consumption and environmentally benign.