Abstract
The shear stress induced breaking behavior of carbon black (CB) aggregates during the manufacturing process of Li‐ion batteries is investigated via microscale discrete element method (DEM) simulations. The relevant range of shear stress is chosen according to a planetary mixer and cathode slurries with high solid content. Aggregates of different sizes and shapes are modeled using a self‐written algorithm based on the tunable dimension method. Then, suitable models are chosen for representing the solid bridges between the primary particles of the CB aggregates and relevant fluid forces. The results show a correlation between aggregate size and critical shear stress which is required to initiate aggregate fracturing. Furthermore, a change in aggregate shape is linked to applied stress and initial aggregate size and shape. Hence, a recommendation for an efficient disintegration of CB aggregates during the mixing process is made.
Highlights
One of the biggest challenges in the transition from fossil fuels to due to experienced shear stress during the manufacturing process and its impact on overall battery capacity and performance.[11]
~Fc 1⁄4 ðknδn À γn~vnrelÞ þ ðktδt À γt~vtrelÞ. Even though this contact model is broadly used in DEM simulations, many linear and nonlinear models for the calculation of the elastic and viscoelastic damping constants have been proposed by several research groups
The same applies to the carbon black (CB) aggregates
Summary
One of the biggest challenges in the transition from fossil fuels to due to experienced shear stress during the manufacturing process and its impact on overall battery capacity and performance.[11]. Li-ion batteries have proven to be process and the final electrode structure.[12,13] For these reasons, a reliable solution for many applications. Since their introduction the presented work will mainly focus on the positive. Since numerous studies the dispersion process are a promising alternative These do were performed all with the goal of improving the battery perfor- not require the use of expensive materials or sophisticated anamance, capacity, and life span. The authors try to provide meaningful insight into aggregate behavior under shear stress of a viscous fluid
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