Hydrothermal Organic Acid Leaching of Positive Electrode Material of Lithium-Ion Batteries

Shibazaki Kensuke, Azuma Daiki, Watanabe Masaru, Kishita Atsushi, Hiraga Yuya, Miyazaki Hideki

doi:10.1252/kakoronbunshu.46.167

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実リチウムイオン電池廃棄物に対する水熱法を用いた構成金属の有機酸浸出
ジツリチウムイオンデンチハイキブツニタイスルスイネツホウオモチイタコウセイキンゾクノユウキサンシンシュツ

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<p>To construct a recycling process for spent lithium-ion batteries, the hydrothermal leaching by organic acid of lithium-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 structure of the positive electrode elements was changed by the pretreatment, which affected the leaching mechanism.</p>

Journal

KAGAKU KOGAKU RONBUNSHU

KAGAKU KOGAKU RONBUNSHU 46 (5), 167-175, 2020-09-20

The Society of Chemical Engineers, Japan

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