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리튬 이차전지 제조 공정으로부터 발생한 리튬 폐액의 재활용을 위한 전기 투석 수처리 장치의 리튬 농축 효율에 관한 연구
한덕현 ( Deokhyun Han ),정항철 ( Hangchul Jung ),김보람 ( Boram Kim ),김대원 ( Dae-weon Kim ) 한국수처리학회 2020 한국수처리학회지 Vol.28 No.5
The rapid market growth in recent years for eco-friendly electric vehicles and more generally, energy storage technologies, has led to an increase in demand for lithium which is a major raw material for lithium secondary batteries. The technology for producing lithium ions from lithium carbonate in seawater 25 L has been developed, but there are about 60 kinds of various ionic components, which is a difficult process, and only about 4 mg of lithium is recovered. In order to meet the demand of lithium, research is being actively conducted to recycle lithium secondary batteries that contain lithium and can be recycled as a circulating resource, but there is little research on recycling of waste liquid generated during the manufacturing process of lithium secondary batteries. Wastewater of lithium is thought to be able to efficiently concentrate lithium metal during recycling using an environmentally friendly electrodialysis water treatment process. In this study, lithium was concentrated using the electrodialysis of wastewater generated during the production of lithium-ion batteries. The efficiency of the electrodialysis varied according to the applied voltage and the volume ratio of the solution. However, due to the disadvantages of employing limited current densities, optimum conditions for the process needed to be selected. Therefore, the concentration efficiency of lithium was confirmed according to the process conditions, and optimum process conditions were derived. Lithium concentrated at the optimum conditions secured a concentration increase of about 128% compared to the initial concentration of wastewater.
리튬이차전지 공정부산물로부터 고효율 리튬 회수를 위한 전기투석 공정의 최적화 연구
한덕현 ( Deokhyun Han ),정항철 ( Hang-chul Jung ),김보람 ( Boram Kim ),김대원 ( Dae-weon Kim ) 한국수처리학회 2021 한국수처리학회지 Vol.29 No.5
Recently, the demand for lithium has increased due to the rapid increase in the eco-friendly electric vehicle and energy storage system industry, and the waste liquid generated during the lithium secondary battery manufacturing process contains about 5000 ppm of lithium. Lithium contained in waste liquid is about 20 times greater than that contained in general seawater. In the case of general process waste, it cannot be reused immediately. But it can be recycled through the water treatment process. Among the various recycling processes, the electrodialysis recycling process uses electrical energy. Therefore, it is an eco-friendly water treatment method that can perform lithium concentration and desalination of lithium waste liquid and simultaneously treat purified water and lithium. In this paper, the electrodialysis optimal process conditions for lithium-containing waste liquids generated during the lithium secondary battery manufacturing process were confirmed. Variables input to the electrodialysis optimal process were combined using the Minitab program, and the individual effects and importance of each reaction were confirmed through Minitab. Analysis result values were identified as the desirability of the multi-response system. The optimization of the process was carried out using a design of experiments method and was performed and analyzed under three conditions: a concentration process, a desalination process, and a concentration and desalination process.
폐리튬이차전지 스크랩 재활용을 통한 양극활물질 전구체 합성 연구
김보람,김대원,김태헌,이재원,정항철,한덕현,정수훈,양대훈,Kim, BoRam,Kim, Dae-Weon,Kim, Tae-heon,Lee, Jae-Won,Jung, Hang-chul,Han, Deokhyun,Jung, Soo-Hoon,Yang, Dae-Hoon 한국결정성장학회 2022 한국결정성장학회지 Vol.32 No.2
A metal salt solution was prepared from valuable metals (Ni, Co, Mn) recovered from a scrap of waste lithium secondary batteries, and an NCM811 precursor was synthesized from the solution. The effect on precursor formation according to reaction time was confirmed by SEM, PSA, and ICP analysis. Based on the analysis results, the electrochemical properties of the synthesized NCM811 precursor and the commercial NCM811 precursor were investigated. The Galvano charge-discharge cycle, rate performance, and Cycle performance were compared, and as a result, there was no significant difference from commercial precursors.