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Received March 31, 2022
Accepted July 13, 2022
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Recycling of LiMO2 cathode materials by a chlorination-based Li extraction technique
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 Eng., Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
minku@kaeri.re.kr
Korean Journal of Chemical Engineering, October 2022, 39(10), 2594-2599(6), 10.1007/s11814-022-1232-y
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Abstract
The recycling of Li(Ni1/3Co1/3Mn1/3)O2 (NCM) and LiCoO2 (LCO), which are cathode materials for Li-ion batteries, was demonstrated via a chlorination-based Li extraction technique. The recycling process follows a chlorination - washing/filtering - drying - mixing - re-synthesis process. Around 86% of Li was removed through the chlorination - washing/filtering steps. The resulting transition metal oxide powder was dried and then mixed with Li2CO3, a Li precursor. Re-synthesis experiments were conducted at 900 ℃ for 24 h and the weight of the final products was 88.5 and 88.0 wt% of their input amounts in NCM and LCO, respectively. Structural changes were analyzed by X-ray diffraction to confirm the absence of impurity phases in the re-synthesized specimens. Electrochemical evaluation revealed that the re-synthesized NCM and LCO exhibit corresponding initial specific capacities of 157 and 153 mAh/g.
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