Metal recovery from spent lithium-ion power batteries by roasting and water leaching method

Abstract

Abstract: Lithium-ion power batteries have been widely used in new energy vehicles. The clean and efficient recovery of Li, Ni, Co, Mn and other metals after their scrap is of great significance to promote the recycling of non-ferrous metals. Li, Ni, Co, and Mn are recoveringfrom lithium-ion power batteries using LiNi_0.5Co_0.2Mn_0.3O₂ as the cathode material, and TG-DSC, XRD, ICP-OES, XPS, and thermodynamics and other studies is used to study the phase evolution law of the recycling process and the main factors which affect the metal recovery rate. The research results show that the mixture composed of LiNi_0.5Co_0.2Mn_0.3O₂ and NaHSO₄·H₂O, the occurrence state of Li, Ni, Co, and Mn after roasting have been changed from the complex metal oxide form which is insoluble in water into the form of water-soluble metal sulfate. After roasting, the roasted product is leached with water under certain conditions, the elements Li, Ni, Co, and Mn are transferred to the aqueous solution in the form of metal ions for recovery. The composition of the mixture and the roasting temperature restrict the occurrence of Li, Ni, Co, and Mn elements in the roasted material, and are also the main factors affecting the recovery rate of Li, Ni, Co, and Mn; the roasting and water leaching process is adopted.

Key words: spent lithium-ion power battery, LiNi_0.5Co_0.2Mn_0.3O₂, roasting-water leaching, metal recovery

CLC Number:

TG450.40

WANG Da-hui, ZHANG Ke, CHEN Huai-jing, LIU Zhen-ning, HU Ping-ping. Metal recovery from spent lithium-ion power batteries by roasting and water leaching method[J]. Journal of Lanzhou University of Technology, 2021, 47(5): 10-18.

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