ABSTRACT For a sustainable society, the development of efficient and clean recycling processes for lithium‐ion batteries (LIBs) is highly demanded. Submerged crushing is one of the promising pretreatments for the recycling processes because it has a lower risk of combustion of LIBs during the crushing. A major bottleneck in the implementation of this process is the development of removal methods of organics originating from LIB electrolyte to control the chemical oxygen demand of the wastewater. It has been reported that alcohols such as ethylene glycol (EG), derived from the organic solvents, can be removed by ozonation under alkaline conditions. However, several issues remain, including the exploration of efficient removal methods applicable even under non‐alkaline conditions, and the investigation of removal processes for additives used in LIBs. In this paper, electro‐oxidation was utilized as an alternative method to ozonation, and the removal of EG by the electro‐oxidation was investigated. Additionally, the ozonation and the electro‐oxidation of adiponitrile (ADN) and 3‐hydroxypropanesulfonic acid (3‐HPSA), which come from the organic additives in LIBs, were conducted. It was experimentally observed that the electro‐oxidation of EG efficiently occurred. On the other hand, the oxidative removals of ADN and 3‐HPSA did not sufficiently occur in the electro‐oxidation, but they did in ozonation. Based on the results, the process for the organic removal in the LIB recycle was proposed.
Yasuda et al. (Tue,) studied this question.
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