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Continuous hydrothermal leaching of LiCoO2 cathode materials by using citric acid
Reaction Chemistry & Engineering ( IF 3.9 ) Pub Date : 2020-08-03 , DOI: 10.1039/d0re00286k
Qingxin Zheng 1, 2, 3, 4, 5 , Kensuke Shibazaki 4, 5, 6, 7 , Tetsufumi Ogawa 4, 5, 6, 7 , Atsushi Kishita 1, 2, 3, 4, 5 , Yuya Hiraga 1, 2, 3, 4, 5 , Yuta Nakayasu 4, 8, 9, 10 , Masaru Watanabe 1, 2, 3, 4, 5
Affiliation  

The first run of continuous hydrothermal leaching of lithium-ion battery cathode materials, LiCoO2, was performed using citric acid as the leachant at 200 °C. The flow system was specially designed and customized. Prior to the hydrothermal leaching experiments, a three-layer model was used to predict the flow state in this flow system, and a cold flow test using two kinds of flow lines was performed to determine the conditions in the preliminary experiments. Finally, the pulp density of the slurry and the flow rate were set to 10 g L−1 and 30 ml min−1, respectively, for the continuous hydrothermal leaching experiments. At 60 min after the start of slurry feeding, the leaching efficiency of Li and Co reached 81.3% and 92.7%, respectively, and can continue to increase with the extension of time. The successful run indicated that the process of hydrothermal leaching is feasible and promising to be applied in practice. Meanwhile, a problem of acid corrosion caused by the use of citric acid during this process was revealed and is expected to be resolved using inner coating materials with high acid corrosion resistance or organic acids with low or no acid corrosion as the leachant.

中文翻译:

柠檬酸对LiCoO2正极材料的连续水热浸出

锂离子电池正极材料LiCoO 2的首次连续水热浸出是在200°C下使用柠檬酸作为浸出剂进行的。流量系统是专门设计和定制的。在进行水热浸出实验之前,使用三层模型预测该流动系统中的流动状态,并使用两种流动管线进行冷流试验以确定初步实验中的条件。最后,将浆料的纸浆密度和流速设置为10 g L -1和30 ml min -1分别用于连续的热液浸出实验。在开始进料后60分钟,Li和Co的浸出效率分别达到81.3%和92.7%,并且可以随着时间的延长而继续增加。成功的运行表明,热液浸出工艺是可行的,有望在实践中得到应用。同时,揭示了在该过程中由于使用柠檬酸引起的酸腐蚀问题,并有望通过使用具有高抗酸腐蚀性的内涂层材料或具有低酸腐蚀或无酸腐蚀的有机酸作为浸出剂来解决。
更新日期:2020-08-03
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