The recycling of spent LiFePO₄ batteries has received extensive attention due to its environmental impact and economic benefit. In the pretreatment process of spent LiFePO₄ batteries, the separation of active materials and current collectors determines the difficulty of the recovery process and product quality. In this work, a facile and efficient pretreatment process is first proposed. After only freezing the electrode pieces and immersing them in boiling water, LiFePO₄ materials were peeled from the Al foil. Then, after roasting under an inert atmosphere and sieving, all the cathode and anode active materials were easily and efficiently separated from the Al and Cu foils. The active materials were subjected to acid leaching, and the leaching solution was further used to prepare FePO₄ and Li₂CO₃. Finally, the battery-grade FePO₄ and Li₂CO₃ were used to re-synthesize LiFePO₄/C via the carbon thermal reduction method. The discharge capacities of re-synthesized LiFePO₄/C cathode were 144.2, 139.0, 133.2, 125.5, and 110.5 mA·h·g⁻¹ at rates of 0.1, 0.5, 1, 2, and 5 C, which satisfies the requirement for middle-end LiFePO₄ batteries. The whole process is environmental and has great potential for industrial-scale recycling of spent lithium-ion batteries.

废LiFePO ₄电池的回收利用因其对环境的影响和经济效益而受到广泛关注。在废LiFePO ₄电池的预处理过程中，活性材料与集流体的分离决定了回收过程的难易程度和产品质量。在这项工作中，首先提出了一种简便有效的预处理工艺。在将电极片冷冻并浸入沸水中后，LiFePO ₄材料从铝箔上剥离。然后，在惰性气氛下焙烧和筛分后，所有正极和负极活性材料都可以轻松有效地与铝箔和铜箔分离。对活性物质进行酸浸，浸出液进一步用于制备FePO ₄和Li ₂ CO ₃。最后，使用电池级FePO ₄和Li ₂ CO ₃通过碳热还原法重新合成LiFePO ₄ /C。再合成LiFePO ₄ /C正极的放电容量分别为144.2、139.0、133.2、125.5和110.5 mA·h·g ^-1倍率分别为0.1、0.5、1、2和5 C，满足中端LiFePO ₄电池的要求。整个过程是环保的，对于废旧锂离子电池的工业规模回收具有巨大潜力。