Abstract
A new approach to recycle Li(Ni,Co,Mn)O2 (NCM, Ni : Co : Mn=1 : 1 : 1) is introduced and experimentally demonstrated. Chlorine gas was employed as a reaction agent to selectively extract Li from NCM. Through a reaction at 550 °C for 4 h under a 180 mL/min Ar+20 mL/min Cl2 flow, Li was converted into water-soluble LiCl, while the initial transition metals (Ni, Co, and Mn) were converted into a spinel-type oxide phase. Minor amount of transition metals, which reacted with Cl2 to produce transition-metal chlorides, were recovered in the subsequent precipitation step. An amount of 94.9 wt% of transition-metal recovery ratio was achieved through the recovery processes. The amount of Li recovered as Li2CO3 was 35.8 wt% of the initial amount. A new NCM was successfully re-synthesized using the recovered materials as well as additional Li2CO3, resulting in a layered NCM structure. The re-synthesized NCM was electrochemically evaluated by fabricating a CR2032 coin cell which exhibited a capacity of 105 mAh/g.
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Acknowledgements
This work was sponsored by Development of New Process for Recycling of NCM Lithium-ion Battery Cathode Material project awarded through KAERI Innovation Challenge program. The authors are grateful to Dr. Chan Woo Park of KAERI for his support.
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Jeon, M.K., Kim, SW., Eun, HC. et al. Recycling of Li(Ni,Co,Mn)O2 via a chlorination technique. Korean J. Chem. Eng. 39, 1472–1477 (2022). https://doi.org/10.1007/s11814-022-1083-6
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DOI: https://doi.org/10.1007/s11814-022-1083-6