Considering the increasing price of raw materials and environmental pollution, the recycling of used lithium battery cathode materials has very important economic and environmental value. In this experiment, a green recycling method is used to recover valuable metals from spent LiNi0.6Co0.2Mn0.2O2 batteries using DL‐malic acid and H2O2 as a leaching system. The effects of reaction temperature, acid concentration, H2O2 volume concentration, reaction time, and solid–liquid ratio on the leaching efficiency are investigated by orthogonal and single variable condition experiments. Under the optimum conditions, the leaching efficiencies of Ni, Co, Mn, and Li are 96.2%, 97.1%, 97.6%, and 98.1%, respectively, while the leaching efficiency of Al is only 3.5%. The effect of H2O2 on the leaching process is further investigated by macroscopic characterization and kinetic analysis. The study indicates that the leaching process is controlled by a chemical reaction in the absence of H2O2, and the leaching process after the addition of H2O2 is controlled by the chemical reaction process and the diffusion process.

LiNi 1-x-y Co x Mn y O 2 lithium-ion battery, as the most installed battery of new energy vehicles, is facing the problem of large-scale scrap. In this paper, (Ni 0.1 Co 0.3 Mn 0.6 ) 3 O 4 anode material with a microsphere structure was successfully synthesized by carbonate coprecipitation method, which was obtained by recycling spent LiNi 0.6 Co 0.2 Mn 0.2 O 2 lithium-ion batteries through hydrometallurgy technology. This method eliminates the cumbersome separation steps, reduces the process cost, and realizes efficient recovery of valuable metals. The (Ni 0.1 Co 0.3 Mn 0.6 ) 3 O 4 anode material was characterized by inductively coupled plasma, X-ray photoelectron spectroscopy, X-ray diffraction analysis, scanning electron microscopy, and electrochemical measurements. The results show that (Ni 0.1 Co 0.3 Mn 0.6 ) 3 O 4 anode material has a microsphere structure with high crystallinity and exhibits a high discharge capacity (1575 mAhÁg −1 at 100 mAÁg −1 ) and a good cycling performance (659 mAhÁg −1 at 100 mAÁg −1 after 50 cycles). This work provides a new idea for the recycling of spent LiNi 1-x-y Co x Mn y O 2 batteries.

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