Application of hydrothermal leaching technology to spent LIB cathode materials with citric acid using batch-type device and flow system

Qingxin Zheng, Kensuke Shibazaki, Tetsufumi Ogawa, Atsushi Kishita, Yuya Hiraga, Masaru Watanabe

Research output: Contribution to journalArticlepeer-review

Abstract

Hydrothermal leaching of spent lithium-ion battery (LIB) cathode materials, Li(Ni, Mn, Co)O2 (NMC), was performed with citric acid using a batch-type device and a flow system in turn. Before the hydrothermal experiments, NMC cathode materials were pretreated and characterized. The effect of citric acid concentration on leaching efficiencies of metal components was investigated using the batch-type device. The preliminary experimental conditions for the continuous hydrothermal leaching using the flow system were assessed and pre-set, including the temperature of 200°C, the citric acid concentration of 0.4 mol/L, the pulp density of 10 g/L, and the flow rate of 30 mL/min. NMC cathode materials were leached continuously in hydrothermal water using the flow system. The leachate with a high leaching efficiency could be collected continuously since 65 min of feeding the slurry, and the maximum leaching efficiency of Li, Co, Ni, and Mn was 96%, 91%, 98%, and 94%, respectively.

Original languageEnglish
Pages (from-to)344-350
Number of pages7
JournalJOURNAL of CHEMICAL ENGINEERING of JAPAN
Volume54
Issue number6
DOIs
Publication statusPublished - 2021 Jun 20

Keywords

  • Batch
  • Citric Acid
  • Flow System
  • Hydrothermal Leaching
  • LIB Cathode Materials

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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