Shape and size analysis of non-spherical graphite utilizing planar elongational flow in a cross-slot microchannel with viscoelastic particle focusing.
발표자
()
초록
내용
Graphite is a conventional anode active material where lithiation takes place through its edge planes, which has been widely used due to its high theoretical capacity and low cost. It is apparent that the size and shape of the graphite significantly affect both battery performance and the rheological properties of electrode slurry, which play key roles in battery production. However, there are few methods to determine the shape and size of the graphite. In this work, we demonstrate the novel microfluidics-based shape analysis method for the non-spherical graphite particles utilizing planar elongational flow field combined with viscoelastic particle focusing in the cross-slot microchannel. We prepared as-received natural and ball-milled graphite samples. We demonstrate the shape and size of the graphite can be quantified by the circularity, aspect ratio, convexity, and area using our method. We also compared the rheological properties of the anode slurries and the battery pereformance, depending on the shape and size of the graphite.