ScholarWorks@성균관대학교

초록

Dry electrode fabrication offers significant advantages over conventional slurry-based methods by eliminating solvent usage and significantly reducing energy consumption during manufacturing. However, the fibrillation of polytetrafluoroethylene (PTFE), commonly used as a binder in dry processing, often leads to particle agglomeration. This results in poor thickness control, compromised adhesion, and limited scalability. We present a sieve-assisted deposition strategy to suppress particle agglomeration during the fabrication of LiNi0.Co-6(0).Mn-2(0).O-2(2) (NCM622) dry electrodes. This simple yet effective method enabled the formation of electrodes with uniform thickness in the range of 70 similar to 80 mu m, which is critical for achieving high-energy and high-power densities. We further investigated the influence of thermal compression conditions on; interfacial adhesion and electrochemical performance. Applying a compaction load of 200 kg at temperature above 150 degrees C significantly enhanced adhesion between the PTFE binder and the aluminum current collector, surpassing the internal cohesion of the electrode layer. This led to improved structural stability, reduced internal resistance, and enhanced capacity retention at high C-rates. Our finding provide practical insights into the fabrication of solvent-free dry electrodes, offering clear process guideline for mitigating agglomeration, controlling electrode thickness, and optimizing interfacial bonding. This work contributes to the advancement of environmentally sustainable and high-performance lithium-ion battery manufacturing.

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