Efficient recovery of valuable metals from cathode materials of spent LiCoO2 batteries via co-pyrolysis with cheap carbonaceous materials
Efficient recovery of valuable metals from cathode materials of spent LiCoO2 batteries via co-pyrolysis with cheap carbonaceous materials
复制标题
通过与廉价碳质材料共热解从废旧 LiCoO2 电池正极材料中有效回收有价金属
DOI：
10.1016/j.wasman.2022.05.017
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发表时间：
2022
期刊：
影响因子：
8.1
通讯作者：
Xun Zhu
中科院分区：
文献类型：
--
作者：
Yiming Lai;Xianqing Zhu;Jun Li;Qin Peng;Shiyang Hu;Ao Xia;Yun Huang;Qiang Liao;Xun Zhu
从废旧锂离子电池中回收有价金属具有显著的经济效益和环境效益。在这项研究中，提出了一种新的方法，通过与三种不同的碳质材料（废聚乙烯，生物质和煤）共热解回收废旧LiCoO2电池中的有价金属，并进行了评估。热力学分析证明，含碳材料（主要是碳）理论上能够促进LiCoO2的分解过程。煤对LiCoO2分解的促进作用大小顺序为：煤>生物质>聚乙烯，煤的加入可使LiCoO2的分解温度显著降低400 °C。在LiCoO2的分解和还原过程中，碳质物质生成的焦炭起了重要作用，而挥发分没有起重要作用。LiCoO2与煤混合物的热解产物具有典型的超顺磁性和磁滞特性，有利于后续的磁选。Co和Li的回收率分别对热解温度和停留时间敏感。高比例的Co在低于800 °C时以CoO的形式存在，并且没有被完全还原，导致Co在低于800 °C时的回收率相对较低。当热解温度为800 °C，停留时间为10 min时，Co和Li的回收率最高，分别为96.8%和88.7%。最终回收的产品为Co和Li_2CO_3，堆积率和纯度较高。该研究为废旧锂离子电池中有价金属的高效回收提供了一条新途径，具有很高的应用前景。
Recovery of valuable metals from spent Li-ion batteries has prominent economic and environmental benefits. In this study, a novel approach for recycling valuable metals from spent LiCoO2batteries via co-pyrolysis with three different carbonaceous materials (waste polyethylene, biomass, and coal)) was proposed and evaluated. The thermodynamic analysis proved that carbonaceous materials (mainly carbon) were theoretically able to facilitate the decomposition process of LiCoO2. The promotion effect on LiCoO2decomposition was in the following order: coal > biomass > polyethylene, and the decomposition temperature of LiCoO2could significantly reduce by 400 °C via adding coal. The char produced from the carbonaceous materials, rather than the volatiles, played an important role in LiCoO2decomposition and reduction. The pyrolysis products of LiCoO2and coal mixture exhibited typical superparamagnetism and hysteresis behaviours, which benefitted the subsequent magnetic separation. The recovery rates of Co and Li were sensitive to the pyrolysis temperature and residence time, respectively. A high proportion of Co was in the form of CoO below 800 °C and had not been completely reduced, leading to the relatively lower recovery rates of Co below 800 °C. The optimal recovery rates of Co (96.8%) and Li (88.7%) were obtained at the pyrolysis temperature of 800 °C and the residence time of 10 min. The final recovery products were Co and Li2CO3with rather high crystallinities and purities. Therefore, this study provided a novel approach for the efficient recycling of valuable metals from spent Li-ion batteries with high application prospects.