盐酸浸出NMC 811（LiNiMnCoO）用于回收锂离子电池正极的浸出机理研究。
Investigation of the leaching mechanism of NMC 811 (LiNiMnCoO) by hydrochloric acid for recycling lithium ion battery cathodes.
作者信息
Xuan Wen, Otsuki Akira, Chagnes Alexandre
机构信息
Université de Lorraine, CNRS, GeoRessources F-54000 Nancy France
出版信息
RSC Adv. 2019 Nov 26;9(66):38612-38618. doi: 10.1039/c9ra06686a. eCollection 2019 Nov 25.
This paper investigates the reactions involved when LiNiMnCoO (NMC 811), which is one of the most promising positive electrodes for the next generation of lithium-ion batteries, is leached by hydrochloric acid. This study shows that the leaching behaviour of lithium is quite different than those observed for nickel, cobalt and manganese contained in NMC 811 since lithium dissolution is faster than those observed for nickel, cobalt and manganese. Analysis of leaching kinetic data evidenced that NMC 811 dissolution occurs in two steps. In the first step, NMC is transformed into a new phase which contains less lithium (2.8 < < 3.6): 1 step: where M = Ni, Mn, Co. In the second step, the new phase is dissolved (limiting step): 2 step: . Finally, the overall reaction of NMC 811 leaching by hydrochloric acid can be written as: 2LiMO + 8HCl ⇌ 2LiCl + 2MCl + 4HO + Cl.
本文研究了盐酸浸出LiNiMnCoO（NMC 811）时所涉及的反应，NMC 811是下一代锂离子电池最具前景的正极材料之一。本研究表明，锂的浸出行为与NMC 811中所含镍、钴和锰的浸出行为有很大不同，因为锂的溶解速度比镍、钴和锰的溶解速度快。浸出动力学数据分析表明，NMC 811的溶解分两步进行。第一步，NMC转变为一个含锂量较少的新相（2.8＜ ＜3.6）：第一步：其中M = Ni、Mn、Co。第二步，新相溶解（限速步骤）：第二步： 。最后，盐酸浸出NMC 811的总反应可写为：2LiMO + 8HCl ⇌ 2LiCl + 2MCl + 4H₂O + Cl₂ 。
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