KAGAKU KOGAKU RONBUNSHU
Online ISSN : 1349-9203
Print ISSN : 0386-216X
ISSN-L : 0386-216X
Environment
Hydrothermal Leaching of LiCoO2 with Sulfuric Acid, Nitric Acid, and Citric Acid
Tatsuya AikawaMasaru WatanabeTaku M. AidaRichard L. Smith Jr.
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2017 Volume 43 Issue 4 Pages 313-318

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Abstract

Spent lithium ion batteries are a secondary resource of metals. To recover Li and Co ions into water, hydrothermal reactions were performed to leach cobalt and lithium from LiCoO2 at 150–300°C for 10–60 min with 0.4 M of various acids. Sulfuric acid, nitric acid, and citric acid were introduced as leaching reagents. For 0.4 M of citric acid aqueous solution, over 90% of Li and Co ions could be leached at 150°C within 10 min. Reduction of cobalt ion (Co3+ to Co2+) is considered to be necessary for dissolution of Co ion into water solution and citric acid acted reductant. Formation of Co citrate, which was detected by UV-vis spectroscopy, was the reason why citric acid was effective for leaching LiCoO2 with hydrothermal water.

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© 2017 The Society of Chemical Engineers, Japan
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