<p>The single particle
model was extended to include electrode and particle volume expansion effects
observed in high capacity alloying electrodes. The model was used to predict
voltage profiles in sodium ion batteries with tin and tin-phosphide negative
electrodes. It was seen that the profiles predicted by the modified model were
significantly better than the classical model. A parametric study was done to
understand the impact of properties such as particle radius, diffusivity,
reaction rate etc on the performance of the electrode. The model was also
modified for incorporating particles having a cylindrical morphology. For the
same material properties, it was seen that cylindrical particles outperform
spherical particles for large L/R values in the cylinder due to the diffusion
limitations at low L/R ratios. A lattice spring-based degradation model was
used to observe crack formation and creep relaxation within the particle. It
was observed that the fraction of broken bonds increases with an increase in
strain rate. At low strain rates, it was seen that there was a significant
expansion in particle volumes due to creep deformation. This expansion helped
release particle stresses subsequently reducing the amount of fracture.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/11337179 |
| Date | 11 December 2019 |
| Creators | Akshay Parag Biniwale (8098121) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/Mechanistic_Analysis_of_Sodiation_in_Electrodes/11337179 |
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