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http://dx.doi.org/10.5229/JKES.2014.17.2.111

A Synthesis of LiCoO2 using the CoSO4 Recovered from Cathode Material Scrap and its Electrochemical Properties  

Kim, Mi-So (Dept. of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University)
Ha, Jong-Keun (School of Materials Science and Engineering & RIGET, Gyeongsang National University)
Park, Se-Bin (R&D center, Metal Chemistry Corp.)
Ahn, Jou-Hyeon (Dept. of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University)
Choi, Im-Sic (R&D center, Metal Chemistry Corp.)
Cho, Kwon-Koo (Dept. of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University)
Publication Information
Journal of the Korean Electrochemical Society / v.17, no.2, 2014 , pp. 111-118 More about this Journal
Abstract
The electrochemical properties using the cells assembled with the synthesized $LiCoO_2$(LCO) were evaluated in this study. The LCO was synthesized from high-purity cobalt sulfate($CoSO_4$) which is recovered from the cathode scrap in the wastes lithium ion secondary battery(LIB). The leaching process for dissolving the metallic elements from the LCO scrap was controlled by the quantities of the sulfuric acid and hydrogen peroxide. The metal precipitation to remove the impurities was controlled by the pH value using the caustic soda. And also, D2EHPA and $CYANEX^{(R)}272$ were used in the solvent extraction process in order to remove the impurities again. The high-purity $CoSO_4$ solution was recovered by the processes mentioned above. We made the 6 wt.% $CoSO_4$ solution mixed with distilled water. And the 6 wt.% $CoSO_4$ solution was mixed with oxalic acid by the stirring method and dried in oven. $LiCoO_2$ as a cathode material for LIB was formed by the calcination after the drying and synthesis with the $Li_2CO_3$ powder. We assembled the cells using the $LiCoO_2$ powders and evaluated the electrochemical properties. And then, we confirmed possibility of the recyclability about the cathode materials for LIBs.
Keywords
$LiCoO_2$ recycling; Cathode material recyclability; High-purity $CoSO_4$; Cobalt recovery;
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Times Cited By KSCI : 2  (Citation Analysis)
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