Continuous hydrothermal leaching of LiCoO2 cathode materials by using citric acid
Continuous hydrothermal leaching of LiCoO2 cathode materials by using citric acid
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DOI：
10.1039/d0re00286k
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发表时间：
2020-08
影响因子：
3.9
通讯作者：
Qingxin Zheng;Kensuke Shibazaki;Tetsufumi Ogawa;Atsushi Kishita;Yuya Hiraga;Y. Nakayasu;Masaru Watanabe
中科院分区：
文献类型：
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作者：
Qingxin Zheng;Kensuke Shibazaki;Tetsufumi Ogawa;Atsushi Kishita;Yuya Hiraga;Y. Nakayasu;Masaru Watanabe
使用柠檬酸作为澄清剂在200 °C下进行锂离子电池阴极材料LiCoO 2的第一次连续水热浸出。流量系统是专门设计和定制的。在水热浸出实验之前，使用三层模型来预测该流动系统中的流动状态，并且使用两种流线进行冷流测试以确定初步实验中的条件。最后，对于连续水热浸提实验，浆料的浆料密度和流速分别设定为10 g L-1和30 ml min-1。在开始料浆进料后60 min，Li和Co的浸出率分别达到81.3%和92.7%，并可随时间的延长继续提高。试验结果表明，水热浸出工艺是可行的，具有良好的应用前景。同时，揭示了在该过程中由于使用柠檬酸而引起的酸腐蚀问题，并且期望通过使用具有高耐酸腐蚀性的内涂层材料或具有低酸腐蚀性或无酸腐蚀性的有机酸作为澄清剂来解决。
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.