Effect of Hydrogen Peroxide on the Recovery of Valuable Metals from Spent LiNi_0.6Co_0.2Mn_0.2O₂ Batteries

Abstract

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.

Recovery of Cobalt, Nickel, and Lithium from Spent Lithium-Ion Batteries with Gluconic Acid Leaching Process: Kinetics Study

“…In the context of the process's "greenness", the inclusion of hydrogen peroxide presents a nuanced impact. On the one hand, H 2 O 2 serves as a reduction agent capable of effectively reducing organic content, aligning with the objective of minimizing environmental impact through the degradation of organic pollutants [33]. This aspect contributes positively to the eco-friendliness of the process by facilitating the breakdown of harmful substances.…”

“…Therefore, the role of H 2 O 2 in this context is dual: it contributes to the oxidation of organic content, aligning with green objectives, yet it necessitates careful consideration due to its potential to generate reactive oxygen species, which can influence the process in diverse ways. Balancing the positive effects of H 2 O 2 in organic content degradation with a comprehensive understanding and management of ROS formation becomes pivotal in assessing the overall "greenness" and environmental impact of the process [33,35]. Further exploration and discussion regarding the optimization and control of H 2 O 2 concentration, reaction conditions, and potential mitigating strategies for ROS formation could enhance the understanding of its impact within the context of eco-friendly processes [33][34][35].…”

“…Balancing the positive effects of H 2 O 2 in organic content degradation with a comprehensive understanding and management of ROS formation becomes pivotal in assessing the overall "greenness" and environmental impact of the process [33,35]. Further exploration and discussion regarding the optimization and control of H 2 O 2 concentration, reaction conditions, and potential mitigating strategies for ROS formation could enhance the understanding of its impact within the context of eco-friendly processes [33][34][35].…”

A Review of the Resourceful Utilization Status for Decommissioned Power Batteries

“…Inorganic acid leaching agents include HCl, HNO 3 , H 2 SO 4 , and H 3 PO 4 . It has been shown that the addition of reducing agents (H 2 O 2 and Na 2 S 2 O 3 ) to inorganic acid-leaching agents can lower the valence state of metal ions, thereby accelerating dissolution [73,74]. The process of inorganic acid leaching produces acidic waste liquid and toxic gases (SO 3 , Cl 2 ), so organic acid leaching has gradually attracted attention, and commonly used organic acid leaching agents include citric acid, malic acid, and oxalic acid.…”

“Acid + Oxidant” Treatment Enables Selective Extraction of Lithium from Spent NCM523 Positive Electrode

“…The process of the hydrometallurgical method is complex, but it has received much attention due to the advantages of obtaining products with higher purity and lower requirements for equipment, etc. Since the use of inorganic acids generates a large amount of wastewater, the use of organic acids such as acetic acid [24,25], ascorbic acid [26,27], and citric acid [28,29] as leaching acids has been increasingly reported in recent years. He et al [30] used Ltartaric acid and hydrogen peroxide as leaching systems and were able to achieve leaching efficiencies of 99.07, 99.31, 98.64, and 99.31% for lithium, nickel, cobalt, and manganese, respectively.…”