废旧锂离子电池中Li, Fe和V的回收及xLiFePO4-yLi3V2(PO4)3的制备

由于LiFePO_4和Li_3V_2(PO_4)_3材料的特征相近,制备方法类似,提供了一种从废旧LiFePO_4和Li_3V_2(PO_4)_3混合电池中回收Li、Fe和V,再制备xLiFePO_4-yLi_3V_2(PO_4)_3的方法。在空气气氛中600℃热处理1h后,去除粘结剂PVDF使活性物质与集流体分离。调节Li、Fe、V和P摩尔比,球磨、锻烧,配制不同比例的xLiFePO_4-yLi_3V_2(PO_4)_3(x:y=5:1,7:1,9:1)复合电极材料。表征了其形貌、结构和电化学性能,结果表明,回收制备的复合材料将同时具备LiFePO_4和Li_3V_2(PO_4)_3两种材料的电化学性能,能显著改善LiFePO_4的倍率性能。

Recovery of Li, Fe and V From Spent Lithium Ion Batteries andPreparation of xLiFePO4 -yLi3V2(PO4)3

Li, Fe and V were reclaimed together and preparedSto xLiFePO₄-yLi₃V₂(PO₄)₃ materials from spent LiFePO₄ and Li₃V₂(PO₄)₃ LIBs, for the reason that they have similar characteristics and preparation method. The spent battery materials were roasted under 600 _oC for 1 hour in air atmosphere to remove the PVDF binder, then the active materials and aluminum foil collector can be separated effectively. The different proportion of xLiFePO₄-yLi₃V₂(PO₄)₃(x:y=5:1,7:1,9:1) materials were prepared by roasted products through adjusting the mole ratio of Li, Fe, V and P , ball milling and calcining. The morphology, structure and electrochemical of composite material were performed. The results show that the composite material have the electrochemical properties of LiFePO₄ and Li₃V₂(PO₄)₃ simultaneously, which can significantly improve the LiFePO₄ ratio performance. This dissertation explores a new way for the recycling of spent LIBs. The study is of good application foreground. It is very important for environmental protection, and is believed to bring both economic and social benefits to us.