Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• The Journal of supercritical fluids, 2020-11, Vol.165, p.104990, Article 104990

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •Hydrothermal leaching of LiCoO2/LiNiO2/LiMn2O4 was performed with citric acid.•At 60 °C for 5 min, Mn ion was completely leached without any reductant;•81 %, 73 %, and 100 % of Li, Ni, and Co was leached at 90 °C for 20 min, respectively.•Metal ions in LiCoO2/LiNiO2 were leached into hydrothermal water with citric acid.•An unreacted-core model was adopted to predict reaction behavior during leaching. 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.