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Effect of Li Concentration-Dependent Material Properties on Diffusion Induced Stresses of Sn Anode

Abstract

Sn is one of the promising Li ion battery anode with high theoretical capacity and mechanical properties that allow for effective relaxation of Li diffusion-induced stresses. Sn is a low melting point metal with low modulus, strength and has the ability to relax stresses via plasticity and creep deformations. In this study, 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. In addition, by incorporating these maximum tensile DIS results, critical size for failure of Sn micropillar was determined to be 5.3 μm for C/10 charging rate. This was then correlated to experimental observations, where fracture occurred in Sn micropillars with sizes larger than 6 μm while 4.4 μm sized Sn micropillar survived the lithiation cycle.

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Publication details

The article was received on 29 Jan 2019, accepted on 11 Apr 2019 and first published on 12 Apr 2019


Article type: Paper
DOI: 10.1039/C9CP00559E
Citation: Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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    Effect of Li Concentration-Dependent Material Properties on Diffusion Induced Stresses of Sn Anode

    C. S. Hong, N. Qaiser, H. G. Nam and S. M. Han, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP00559E

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