Hydrothermal leaching of ternary and binary lithium-ion battery cathode materials with citric acid and the kinetic study

Qingxin Zheng, Masaru Watanabe, Yuta Iwatate, Daiki Azuma, Kensuke Shibazaki, Yuya Hiraga, Atsushi Kishita, Yuta Nakayasu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Metal ions in ternary LIB cathode materials (LiCoO2/LiNiO2/LiMn2O4) were leached into hydrothermal water with citric acid at 60–90 °C. The leaching efficiency increased with temperature and time. Mn ion was completely leached at 60 °C for 5 min, and at 90 °C for 20 min, the leaching efficiencies of Li, Ni, and Co arrived at 81 %, 73 %, and 100 %, respectively. Hydrothermal leaching has a higher rate than the traditional method and avoids the pollutions caused by high-concentration acids and reductants like H2O2. To improve the Ni leaching efficiency, hydrothermal leaching of binary LIB cathode materials (LiCoO2/LiNiO2) with citric acid was performed at 90–120 °C. At above 100 °C for 20 min, the Ni leaching efficiency reached to 90 %. A shrinking unreacted-core model was adopted to predict reaction behavior, and the activated energy for leaching each metal was calculated. Additionally, a reasonable correlation of the rate constants of Co leaching at different pulp densities was attempted.

Original languageEnglish
Article number104990
JournalJournal of Supercritical Fluids
Volume165
DOIs
Publication statusPublished - 2020 Nov 1

Keywords

  • Citric acid
  • Hydrothermal leaching
  • Lithium-ion battery
  • Metal recovery
  • Ternary and binary
  • Unreacted-core model

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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