The growing demand for energy storage devices due to the skyrocketing production/consumption of portable electrical and electronic equipment as well as electric vehicles has promoted battery technologies, resulting in the piling of a large number of waste lithium-ion batteries (LIBs). Organic binders wrapped on electrode particles are usually the main reason that causes the difficulty of liberation and extraction of electrode materials. Pyrolysis or incineration is the general approach to separate the organic binder, leading to fluorinated exhaust gas emissions. In this study, the supercritical carbon dioxide (SC CO₂) combined with a cosolvent dimethyl sulfoxide was innovatively adapted to enable the extraction of organic binders from spent LIBs to facilitate the liberation of the cathode material from aluminum foil. Pure polyvinylidene fluoride was preferentially used to study the SC CO₂ dissolution mechanism. The results indicate that 98.5 wt% polyvinylidene fluoride (PVDF) dissolves in SC CO₂ dimethyl sulfoxide system under the optimum conditions; 70°C process temperature, 80 bar pressure, and 13 min duration. After removing PVDF, the recovered sample was characterized by Fourier Transform Infrared Spectrometer (FTIR) and thermogravimetric analyzer (TGA) to observe its possible re-utilization. It is clear that the surficial chemical groups and content remained the same after treatment. SC CO₂ processing effectively liberates the active cathode material from the aluminum substrate due to removal of the binder. The suggested innovative approach is promising as an alternative pretreatment method due to its high efficiency, relatively low energy consumption, and environmentally friendly features.

由于便携式电气和电子设备以及电动汽车的生产/消费量激增，对能量存储设备的需求不断增长，促进了电池技术的发展，导致大量废旧锂离子电池（LIB）的堆积。包裹在电极颗粒上的有机粘合剂通常是导致电极材料释放和提取困难的主要原因。热解或焚烧是分离有机粘合剂的一般方法，从而导致氟化废气的排放。在这项研究中，超临界二氧化碳（SC CO ₂）与助溶剂二甲亚砜的混合物经过创新改造，能够从废LIB中提取有机粘合剂，从而促进阴极材料从铝箔中释放出来。优选使用纯聚偏二氟乙烯研究SC CO _2的溶解机理。结果表明，在最佳条件下，98.5 wt％的聚偏二氟乙烯（PVDF）可溶于SC CO ₂二甲基亚砜体系。70°C的过程温度，80 bar的压力和13分钟的持续时间。去除PVDF后，通过傅立叶变换红外光谱仪（FTIR）和热重分析仪（TGA）对回收的样品进行表征，以观察其可能的再利用。显然，处理后表面化学基团和含量保持不变。资深大律师通过去除粘合剂，图_2的处理有效地将活性阴极材料从铝基底释放。所建议的创新方法因其高效，相对较低的能耗以及环保功能而有望作为一种替代的预处理方法。