| Investigation of the chlorination behavior of Li(Ni0.6Co0.2Mn0.2)O2 for recycling |
| Min Ku Jeon1, Sung-Wook Kim1, Hyungsub Kim2, Kyoung Sun Kim2,3 |
1Decommissioning Technology Research Division , Korea Atomic Energy Research Institute , 111, Daedeok-Daero 989, Yuseong-Gu , Daejeon 34057 , Korea
2Neutron Science Division , Korea Atomic Energy Research Institute , 111, Daedeok-Daero 989, Yuseong-Gu , Daejeon 34057 , Korea
3Department of Chemical and Biomolecular Engineering , Korea University , 145 Anam-Ro, Seongbuk-Gu , Seoul 02841 , Korea |
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Received: August 10, 2022; Revised: October 21, 2022 Accepted: December 8, 2022. Published online: December 21, 2022. |
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| ABSTRACT |
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The chlorination behavior of Li(Ni0.6Co0.2Mn0.2)O2 (NCM(622)), a cathode material for Li-ion batteries, was investigated. Chlorination experiments were conducted in the temperature range of 400–600 ᕑ for 1, 2, 4, and 8 h at each temperature under a 190 mL/min Ar + 10 mL/min Cl2 flow. A gradual phase transition from 1) a layered hexagonal structure to 2) Li-deficient hexagonal structures and to 3) a mixed phase of spinel M3O4 and rock-salt MO structures was revealed by X-ray diffraction. The phase transition was accelerated with an increase in the chlorination temperature in the range of 400–500 ᕑ, while the effect of the temperature was negligible when it exceeded 500 ᕑ. A chlorination-based recycling process was demonstrated using two NCM(622) specimens chlorinated at 500 ᕑ for different reaction times of 1 and 4 h. The final weights of the re-synthesized specimens were equivalent to 88.4 and 90.9 wt% of the input amount for the 1 and 4 h cases, respectively, and their corresponding initial discharge capacities were similar at 161 and 166 mAh/g, despite the fact that they were re-synthesized from starting materials with different crystal structure and Li contents. |
| Key words:
Cathode material · Li-ion battery · NCM · Recycle · Chlorination · Re-synthesis |
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