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Korean Journal of Chemical Engineering, Vol.39, No.6, 1472-1477, 2022
Recycling of Li(Ni,Co,Mn)O2 via a chlorination technique
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+20mL/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 105mAh/g.
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[Cited By]
- Jeon MK, Kim SW, Oh MK, Eun HC, Lee KY, Korean Journal of Chemical Engineering, 39(9), 2345, 2022
- Jeon MK, Kim SW, Kim HS, Kim KS, Korean Journal of Chemical Engineering, 39(10), 2594, 2022
- Liu DY, Lou WB, Sun SN, Zhang Y, Zhang Y, Zheng SL, Korean Journal of Chemical Engineering, 39(12), 3323, 2022
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