Mechanism of Lithium and Cobalt Recovery from Spent Lithium-ion Batteries by Sulfation Roasting Process

Yueshan Yu; Dahui Wang; Huaijing Chen; Xiaodong Zhang; Li Xu; Lixin Yang

doi:10.1007/s40242-019-0010-9

Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (5) : 908 -914. DOI: 10.1007/s40242-019-0010-9

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Mechanism of Lithium and Cobalt Recovery from Spent Lithium-ion Batteries by Sulfation Roasting Process

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Abstract

Different from the traditional pyrometallurgical recovery process of Li and Co from spent lithium-ion batteries, a new recovery method for Li and Co was established by converting LiCoO₂ into water-soluble metal sulfates by roasting a mixture of LiCoO₂ and NaHSO₄·H₂O. The evolution law of the mixture with increased roasting temperature was investigated by thermogravimetry-differential scanning calorimetry(TG-DSC), in situ X-ray diffraction(XRD), XRD, and X-ray photoelectron spectroscopy(XPS). The results show that the phase transition of LiCoO₂ mixed with NaHSO₄·H₂O with increased temperature proceeded as follows: LiCoO₂, NaHSO₄H₂O→LiCoO₂, NaHSO₄→Li_1−xCoO₂, LiNaSO₄, Na₂S₂O₇, Na₂SO₄→Li_1−xCoO₂, Co₃O₄, LiNaSO₄, Na₂SO₄→Co₃O₄, LiNaSO₄. The reaction mechanism of this roasting process may be as follows: LiCoO₂+NaHSO₄·H₂O→1/2Li₂SO₄+ 1/2Na₂SO₄+1/3Co₃O₄+1/12O₂+3/2H₂O, Li₂SO₄+Na₂SO₄=2LiNaSO₄.

Keywords

LiCoO₂ / Chemical evolution / Roasting / In situ XRD

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Yueshan Yu, Dahui Wang, Huaijing Chen, Xiaodong Zhang, Li Xu, Lixin Yang. Mechanism of Lithium and Cobalt Recovery from Spent Lithium-ion Batteries by Sulfation Roasting Process. Chemical Research in Chinese Universities, 2020, 36(5): 908-914 DOI:10.1007/s40242-019-0010-9

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