Abstract
The molten salt electrochemical method was used to reduce the Co in spent LiCoO2. The reduction mechanism of Co (III) in LiCoO2 was analyzed by cyclic voltammetry, square wave voltammetry, and open circuit potential. The reduction process of Co (III) on Fe electrode was studied in NaCl-CaCl2-LiCoO2 molten salt system at 750 °C. The results show that the reduction process of Co (III) is a two-step reduction: Co (III) → Co (II) → Co (0) and they are all quasi-reversible processes controlled by diffusion. Phase analysis (XRD) shows that Li+ and Cl2− in the molten salt form LiCl electrolysis experiments with different voltages were carried out, which proved the stepwise reduction of Co in LiCoO2.
Highlights
Lithium-ion batteries have many excellent electrochemical properties, such as a large number of charge and discharge times and a long cycle life
The electrolysis experiment of LiCoO2 with different voltages confirmed the process of LiCoO2 reduction to Co
The electrochemical test was carried out using a three-electrode system, iron wire chosen as the working electrode (WE) for investigating electrochemical behaviors of Co (III)
Summary
Lithium-ion batteries have many excellent electrochemical properties, such as a large number of charge and discharge times and a long cycle life. Ma et al [17] have invented a method of low-temperature chlorination pyrolysis of waste lithium-ion batteries in order to reduce energy consumption and not use acid-base agents. This method recovers valuable metals into the leaching solution in one step at 300 ◦ C, and the leaching rate is as high as 99%. The electrolyzed CoO and Li2 CO3 combine to form LiCoO2 , so that LiCoO2 can be recycled This simple, comprehensive and green process provide a good idea for the recovery of metallic Co from waste LiCoO2 -based batteries. The electrolysis experiment of LiCoO2 with different voltages confirmed the process of LiCoO2 reduction to Co
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