AI Article Synopsis

  • A new multi-step directional precipitation strategy has been developed to effectively recover valuable metals from leachate produced by disassembling mixed spent lithium-ion batteries.
  • Selective precipitation of metals like manganese (Mn), nickel (Ni), cobalt (Co), and lithium (Li) is achieved by adjusting temperatures, pH levels, and molar ratios during the process.
  • The method shows high recovery rates (over 90% for all metals) and produces high-purity materials suitable for industrial use, making it promising for large-scale recycling of spent batteries.

Article Abstract

The novel strategy of multi-step directional precipitation is proposed for recovering valuable metals from the leachate of cathode material obtained by mechanical disassembly from mixed spent lithium-ion batteries. Based on thermodynamics and directional precipitation, Mn is selectively precipitated under conditions of MRNM (molar ratio of (NH)SO to Mn) = 3, pH = 5.5 and 80 °C for 90 min. Ni was then selectively precipitated using CHNO under conditions of pH = 6, MRCN (molar ratio of CHNO to Ni) = 2, 30 °C and 20 min. Then, the pH was adjusted to 10 to precipitate Co as Co(OH). Finally, Li was recovered by NaCO at 90 °C. The precipitation rates of Mn, Ni, Co, and Li reached 99.5%, 99.6%, 99.2% and 90%, respectively. The precipitation products with high purity can be used as raw materials for industrial production based on characterization. The economical and efficient recovery process can be applied in industrialized large-scale recycling of spent lithium-ion batteries.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8690296PMC
http://dx.doi.org/10.1039/d0ra09297eDOI Listing

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