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arXiv · 1610.00592

Experimental calibration of a Cahn-Hilliard phase-field model for phase transformations in Li-Sn electrodes

Srivatsan Hulikal·Chun-Hao Chen·Eric Chason·Allan Bower
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Abstract

Experiments, numerical simulations, and analytical calculations are used to calibrate a diffuse-interface Cahn-Hilliard model of Li-Sn thin film electrodes that experience a transformation from Sn to Li2Sn5. It is shown that a concentration-gradient dependent mobility can be used in the Cahn-Hilliard equation to give the interface a finite mobility and capture its nonequilibrium behavior. Comparing experiments and simulations, the free-energy of Li-Sn, diffusivity of Li in Sn and Li2Sn5, the exchange current density for the surface reaction, and the mobility of the Sn/Li2Sn5 interface are extracted. The implications of finite interface mobility for practical battery electrodes are discussed.

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Srivatsan Hulikal, Chun-Hao Chen, Eric Chason, Allan Bower. 2016-09-29. Experimental calibration of a Cahn-Hilliard phase-field model for phase transformations in Li-Sn electrodes. https://doi.org/10.1149/2.0701613jes

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