TY - JOUR
T1 - Hydrothermal organic acid leaching of positive electrode material of lithium-ion batteries
AU - Shibazaki, Kensuke
AU - Azuma, Daiki
AU - Watanabe, Masaru
AU - Kishita, Atsushi
AU - Hiraga, Yuya
AU - Miyazaki, Hideki
N1 - Publisher Copyright:
© 2020 The Society of Chemical Engineers, Japan.
PY - 2020
Y1 - 2020
N2 - To construct a recycling process for spent lithium-ion batteries, the hydrothermal leaching by organic acid of lith-ium-ion battery positive electrode materials and spent lithium-ion batteries was examined by treatment with citric acid (0.4‒2.0 mol/dm3) at 80‒200°C for 5‒60 min. Leaching efficiencies of Li, Co and Ni were found to increase with increasing reaction temperature and time. The leaching efficiency of Mn was more than 90% under mild conditions of 110°C for 5 min, but it decreased as the reaction temperature increased, and a white solid precipitated. However, when the temperature was further increased, the leaching efficiency increased again. When the effect of reaction temperature on leaching efficiency was investigated with spent lithium-ion batteries, the positive electrode elements Li, Co, Ni and Mn were all leached. Furthermore, it was suggested that in the leaching of spent lithium-ion batteries, the crystal struc-ture of the positive electrode elements was changed by the pretreatment, which affected the leaching mechanism.
AB - To construct a recycling process for spent lithium-ion batteries, the hydrothermal leaching by organic acid of lith-ium-ion battery positive electrode materials and spent lithium-ion batteries was examined by treatment with citric acid (0.4‒2.0 mol/dm3) at 80‒200°C for 5‒60 min. Leaching efficiencies of Li, Co and Ni were found to increase with increasing reaction temperature and time. The leaching efficiency of Mn was more than 90% under mild conditions of 110°C for 5 min, but it decreased as the reaction temperature increased, and a white solid precipitated. However, when the temperature was further increased, the leaching efficiency increased again. When the effect of reaction temperature on leaching efficiency was investigated with spent lithium-ion batteries, the positive electrode elements Li, Co, Ni and Mn were all leached. Furthermore, it was suggested that in the leaching of spent lithium-ion batteries, the crystal struc-ture of the positive electrode elements was changed by the pretreatment, which affected the leaching mechanism.
KW - Acid Leaching
KW - Citric Acid
KW - Hydrothermal
KW - Lithium-Ion Battery
KW - Spent Lithium-Ion Battery
UR - http://www.scopus.com/inward/record.url?scp=85091111819&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85091111819&partnerID=8YFLogxK
U2 - 10.1252/kakoronbunshu.46.167
DO - 10.1252/kakoronbunshu.46.167
M3 - Article
AN - SCOPUS:85091111819
VL - 46
SP - 167
EP - 175
JO - Kagaku Kogaku Ronbunshu
JF - Kagaku Kogaku Ronbunshu
SN - 0386-216X
IS - 5
ER -