AI Article Synopsis
- The size and shape of graphite are crucial for the performance of lithium-ion batteries and affect the manufacturing of electrode slurries.
- A novel method was developed to accurately characterize graphite particles' edge size and shape by aligning them through a specific flow field in a microchannel.
- The study reveals that ball-milled graphite has a different shape compared to natural graphite, which impacts the rheological properties of slurries, electrode structures, and ultimately the electrochemical performance of the batteries.
Article Abstract
The size and shape of graphite, which is a popular active anode material for lithium-ion batteries (LIBs), significantly affect the electrochemical performance of LIBs and the rheological properties of the electrode slurries used in battery manufacturing. However, the accurate characterization of its size and shape remains challenging. In this study, the edge plane of graphite in a cross-slot microchannel via viscoelastic particle focusing is characterized. It is reported that the graphite particles are aligned in a direction that shows the edge plane by a planar extensional flow field at the stagnation point of the cross-slot region. Accurate quantification of the edge size and shape for both spheroidized natural and ball-milled graphite is achieved when aligned in this manner. Ball-milled graphite has a smaller circularity and higher aspect ratio than natural graphite, indicating a more plate-like shape. The effects of these differences in graphite shape and size on the rheological properties of the electrode slurry, the structure of the coated electrodes, and electrochemical performance are investigated. This method can contribute to the quality control of graphite for the mass production of LIBs and enhance the electrochemical performance of LIBs.
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| http://dx.doi.org/10.1002/smll.202404456 | DOI Listing |
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