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有色金属(冶炼部分):2021,(4):22-27
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废旧混合正极材料还原浸出与沉淀再生研究
(昆明理工大学 冶金与能源工程学院 锂离子电池及材料制备技术国家地方联合工程实验室)
Recycling of Spent Mixture Cathode Materials by Reduction Leaching and Precipitation Regeneration
LIU Lei1,2, FEI Zi-tong, DONG Peng, MENG Qi1,2
(1.Faculty of Metallurgy and Energy Engineering,National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology,Kunming University of Science and Technology,Kunming,650093;2.China)
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投稿时间:2020-11-14    修订日期:2020-11-20
中文摘要: 复杂废旧混合正极材料存在浸出率较低、成本较高、酸浸液金属分离流程较长等问题。采用硫酸为酸浸剂、H2O2为还原剂对废旧混合正极材料进行浸出,采用碳酸盐共沉淀法合成三元NCM622,对其进行结构和形貌分析,以及电化学性能的测试。结果表明,浸出最优条件为:硫酸浓度2.5 mol/L、H2O2添加量0.6 mol/L、搅拌速率400 r/min、时间30 min、温度80 ℃,此条件下,Li、Ni、Co、Mn的浸出率分别为98.79%、97.05%、96.45%和96.31%。XRD测试表明,再生NCM622无杂峰,且呈典型的α-NaFeO2层状结构,SEM显示NMC622颗粒大小均匀、少团聚现象。电化学测试表明,1C倍率下首圈放电比容量为152.87 mAh/g,循环100圈后,容量保持率为91.35%。
Abstract:Complex waste mixed cathode materials have problems of low leaching rate, high cost and long metal separation process from acid leaching solution. These materials were leached by mixed acid precipitation method with sulfuric acid as leaching agent and H2O2 as reductant. NCM622 was synthesized by carbonate coprecipitation method, its microstructure was characterized and its electrochemical performance was measured. The results show that leaching rate of Li, Ni, Co and Mn is 98.79%, 97.05%, 96.45% and 96.31%, respectively under the optimum conditions including sulfuric acid concentration of 2.5 mol/L, H2O2 dosage of 0.6 mol/L, stirring rate of 400 r/min, time of 30 min, and temperature of 80 ℃. XRD analysis shows that regenerated NCM622 has no impurity peak and has typical α-NaFeO2 layered structure. SEM shows NCM622 particles are uniform in size and less agglomerated. Electrochemical test shows that specific discharge capacity of first cycle is 152.87 mAh/g at 1C rate, and capacity retention rate is 91.35% after 100 cycles.
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基金项目:国家自然科学基金资助项目(52004116);国家重点研发计划项目(2019YFC1803501);云南省应用基础研究计划(201901U070053);云南省教育厅科学研究基金项目(2020J0070)
引用文本:
刘磊,费子桐,董鹏,孟奇.废旧混合正极材料还原浸出与沉淀再生研究[J].有色金属(冶炼部分),2021(4):22-27.
LIU Lei,FEI Zi-tong,DONG Peng,MENG Qi.Recycling of Spent Mixture Cathode Materials by Reduction Leaching and Precipitation Regeneration[J].Nonferrous Metals (Extractive Metallurgy),2021(4):22-27.

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