화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.82, 269-277, February, 2020
DOI10.1016/j.jiec.2019.10.023  Export Citation
Separation of lithium, cobalt and nickel from spent lithium-ion batteries using TBP and imidazolium-based ionic liquids
Guillaume Zante1, 2, †, Abderrazak Masmoudi1, Rémi Barillon1, Dominique Trébouet1, and Maria Boltoeva1
  • 1Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
  • 2ADEME, 20 Avenue du Grésillé, 49004 Angers Cédex 01, France
E-mail:
Solvent extraction of lithium ions from sulfuric acid solutions was investigated using imidazolium-based ionic liquids as diluents and tri-n-butyl phosphate as specific ligand. Aqueous phases used were simulating leach liquors of spent lithium-ion batteries, with lithium, cobalt and nickel ions in acidic solutions. A low acidity and a large amount of extractant can ensure high extraction efficiency. But the better selectivity for the lithium ions over the transition metals is obtained using a low amount of extractant and a low pH (pH < 3). The extraction of the lithium ions occurs by cation exchange with the ionic liquid cations. A sacrificial cation was introduced in the organic phase to prevent the losses, but the cation exchange is only reduced by 20%. The increase of the ionic liquid cation alkyl chain length can presumably suppress the cation exchange mechanism, reducing substantially the losses. But the addition of a lipophilic counter-anion in the organic phase is needed to ensure a mechanism of ion pairing with the lithium ion in the organic phase. Using the 1-decyl 3-methylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquid associated to tri-butyl phosphate, a satisfying extraction efficiency is obtained for the lithium ion, together with a sufficient selectivity among the transition metal ions.
Keywords:Ionic liquids;Tri-butyl phosphate;Solvent extraction;Lithium recycling
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