Short process for regenerating Mn-rich cathode material with high voltage from mixed-type spent cathode materials via a facile approach
Short process for regenerating Mn-rich cathode material with high voltage from mixed-type spent cathode materials via a facile approach
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DOI：
10.1016/j.jclepro.2018.03.147
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发表时间：
2018-06
影响因子：
11.1
通讯作者：
Yue Yang;Song Shaole;Feng Jiang;Jiahui Zhou;Wei Sun
中科院分区：
文献类型：
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作者：
Yue Yang;Song Shaole;Feng Jiang;Jiahui Zhou;Wei Sun
从废旧锂离子电池中回收金属价值在环境保护和资源可持续发展方面具有重要意义。但混合型正极材料在高含锰量的PHEV和EV上的应用，给废LiBS的回收利用带来了新的挑战。本研究开发了一种从混合型废旧正极材料中直接再生富锰正极材料的简便方法。用X射线衍射仪(X射线衍射仪)和X射线荧光仪(XRF)对废旧正极材料进行了表征，然后在H_2SO_4+H_2O_2体系中进行了浸出。采用简单的共沉淀法直接从浸出液中再生出球形富锰正极材料，然后进行固相烧结。采用X射线衍射仪、扫描电子显微镜、电感耦合等离子体原子发射光谱仪、激光粒度仪和电化学测试等手段对再生正极材料进行了表征。结果表明，纯正极材料具有均匀的粒度分布和层状结构。此外，具有高工作电压(>；4.5 V)的再生正极材料具有良好的放电容量。清洁生产分析表明，整个过程能有效减少废渣和水，有利于固体废物的资源化。同时，与传统方法相比，该工艺可以简化回收工艺，获得高附加值的富锰正极材料，并最大限度地回收混合型废旧正极材料中的锰。
Recovering metal values from spent Lithium ion batteries (LIBs) enjoys a great significance in environmental protection and sustainable development of resources. But the application of mixed-type cathode materials in PHEV and EV with high content of manganese brings new challenges for spent LIBs recycling. In this study, a facile approach for directly regenerating Mn-rich cathode material from mixed-type spent cathode materials was developed. The spent cathode materials were firstly tested by X-Ray Diffraction (XRD) and X-ray fluorescence (XRF) and then leached in H2SO4+H2O2system. The spherical Mn-rich cathode material was directly regenerated from leaching liquor through a facile co-precipitation method followed by solid-phase sintering. The regenerative cathode material was measured by XRD, scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy system (EDXS), inductively coupled plasma atomic emission spectrometry (ICP), laser particle size analyzer and electrochemical tests. According to the results, pure cathode material exhibits a uniform particle size distribution and a layered structure. Furthermore, the regenerative cathode material with high working voltage (>4.5 V) possesses excellent discharge capacity. Cleaner production analysis indicates that whole process can effectively reduce waste residue and water, and helps turn the solid waste into resource. Meanwhile, compared to traditional methods, the proposed process can simplify the recovery process, obtain high value added Mn-rich cathode material and maximize the recovery of manganese in the mixed-type spent cathode materials.