Effect of Carboxymethyl Cellulose (CMC) and Graphite on the Rheological Properties of Anode Slurries for Lithium-ion Battery
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The particle dispersion quality of Lithium-ion electrode slurries is considered a key factor related to various problems encountered in manufacturing processes. Anode slurry consists of conductive additives, active materials, binders, and a solvent. These materials affect the particle dispersion and microstructure of slurries. In this study, the effects of binders and active materials were investigated on particle dispersion and microstructure. We prepared anode slurries using three carboxymethyl celluloses with different molecular weights (90, 250, and 700 kDa) as binders, two graphites with different shapes (flake and spherical) as active materials, carbon black as a conductive additive, and water as a solvent. To analyze the microstructure of anode slurries, rheological properties were measured by dynamic oscillatory shear tests. Furthermore, the morphologies of slurries and dried films were investigated by optical microscope and field emission scanning electron microscope images.