Hydrothermal Leaching of LiCoO<sub>2</sub> with Sulfuric Acid, Nitric Acid, and Citric Acid

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  • Aikawa Tatsuya
    Graduate School of Environment, Tohoku University
  • Watanabe Masaru
    Graduate School of Environment, Tohoku University Department of Chemical Engineering, Graduate School of Engineering, Tohoku University
  • Aida Taku M.
    Graduate School of Environment, Tohoku University
  • Smith Jr. Richard L.
    Graduate School of Environment, Tohoku University Department of Chemical Engineering, Graduate School of Engineering, Tohoku University

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  • 硫酸，硝酸およびクエン酸を用いたコバルト酸リチウムの水熱酸浸出
  • リュウサン,ショウサン オヨビ クエンサン オ モチイタ コバルトサン リチウム ノ スイネツサン シンシュツ

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<p>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.</p>

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