Understanding the extensional rheological properties of Li-ion anode slurries using stop-flow/dripping-onto-substrate capillary break-up rheometry (SF-DoS/CaBER)
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Li-ion batteries have attracted much attention due to their high energy density and power. Coating process of electrode slurries on metal foils is a key process for the mass production of the lithium-ion batteries. During the coating process, the electrode slurries experience both shear and elongational flow fields. The elongational flow fields are frequently encountered in the contraction geometry in a slot-die coater or patch-coating process. However, it is not well understood how the components of the electrode slurries affect the elongational rheological properties of the electrode slurry. In this work, we introduce a novel approach that combines a stop-flow (SF) method with DoS-CaBER for measuring the extensional rheological properties of Li-ion battery anode slurries. We show that the SF-DoS/CaBER method can successfully characterize the pinch-off dynamics of Li-ion anode slurries. We also demonstrate that the extensional rheological properties of the anode electrode slurries are significantly affected by the binder amount and the species of graphite (natural or synthetic).