| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
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| Symposium
|
Functional Nanomaterials 2020: Translating Innovation into Pioneering Technologies
|
| Presentation Title |
N-47: Effect of Lithium Concentration-dependent Material Properties on Diffusion Induced Stresses of Sn Anode |
| Author(s) |
Chung Su Hong, Nadeem Qaiser, Hyeon Gyun Nam, Seung Min Han |
| On-Site Speaker (Planned) |
Chung Su Hong |
| Abstract Scope |
Sn is a promising Li ion battery anode with mechanical properties that allow for effective relaxation of Li diffusion-induced stresses. Concentration-dependent material properties are used in numerical simulations to model the Li diffusion-induced stress evolution in Sn micropillars. Simulation results using lower modulus and high diffusivity with increasing Li content resulted in a completely different failure mode in comparison to that of concentration-independent simulation results. Tensile hoop-stress needed for crack propagation was analyzed to be at the core for concentration independent material properties that switched to tensile hoop-stress being at the surface for the case of concentration independent simulation results. Also, by incorporating maximum tensile DIS results, critical size for failure of Sn micropillar was determined to be 5.3μm for C/10 charging rate. This was then correlated to experimental observations, where fracture occurred in Sn micropillars with sizes larger than 6μm while 4.4μm sized Sn micropillar survived the lithiation cycle.
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| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |