Lithium-ion batteries (LIBs) dominate the industry of rechargeable batteries in recent years due to their advantages, including high energy and power density and relatively long lifespan. Despite these advantages, the disposal of spent LIBs into the ground is harmful to the environment, which needs to be addressed by recycling spent LIBs. The available recycling methods for spent LIBs such as pyrometallurgy and hydrometallurgy focus only on collecting valuable elements from the spent LIBs. The direct physical recycling method may be more economical than the other two methods if the mixed cathode and anode active materials are separated, directly regenerated, and then used to make new LIBs. The first obstacle in this method is the separation of different types of spent active materials that came in the form of micro-sized powder (filter cake). This study aims to separate the mixture of cathode and anode active materials by adopting Stokes' law. The focus is on the physical separation rather than the thermal or chemical separation methods to avoid damaging the morphology and composition of electrode active materials. The proposed mathematical model shows how fast and effectively different electrode materials can be separated by adjusting the heavy liquid density. For validation, several experiments are conducted to separate the cathode active materials (LiCoO₂, LiFePO_4, LiNi_0.8Co_0.15Al_0.05O_2, LiNi_1/3Co_1/3Mn_1/3O₂, and LiMn₂O₄) and the anode active material (Graphite) from each other. Overall, this study shows how rapidly and effectively (high purity) electrode active materials can be separated without damaging the morphology and the composition of electrode active materials.

近年来，锂离子电池（LIB）因其能量和功率密度高以及相对较长的寿命等优势在可充电电池行业中占据主导地位。尽管有这些优点，但将废 LIB 处理到地下对环境有害，这需要通过回收废 LIB 来解决。可用的废 LIB 回收方法，如火法冶金和湿法冶金，仅侧重于从废 LIB 中收集有价值的元素。如果将混合正极和负极活性材料分离、直接再生，然后用于制造新的 LIB，直接物理回收方法可能比其他两种方法更经济。该方法的第一个障碍是分离以微粉（滤饼）形式出现的不同类型的废活性材料。本研究旨在采用斯托克斯定律分离正极和负极活性材料的混合物。重点是物理分离而不是热或化学分离方法，以避免破坏电极活性材料的形态和组成。所提出的数学模型显示了通过调整重液密度可以如何快速有效地分离不同的电极材料。为了验证，进行了几个实验来分离正极活性材料（LiCoO 所提出的数学模型显示了通过调整重液密度可以如何快速有效地分离不同的电极材料。为了验证，进行了几个实验来分离正极活性材料（LiCoO 所提出的数学模型显示了通过调整重液密度可以如何快速有效地分离不同的电极材料。为了验证，进行了几个实验来分离正极活性材料（LiCoO_{如图2所示}，LiFePO _{4 、} LiNi _0.8 Co _0.15 Al _0.05 O _{2 、} LiNi _1/3 Co _1/3 Mn _1/3 O ₂和LiMn ₂ O ₄）和负极活性材料（石墨）彼此分离。总体而言，这项研究表明，在不破坏电极活性材料的形态和组成的情况下，可以如何快速有效地分离（高纯度）电极活性材料。