Experimental Calibration of a Cahn-Hilliard Phase-Field Model for Phase Transformations in Li-Sn Electrodes. Issue 13 (29th September 2016)

• Record Type: Journal Article
• Authors: Hulikal, Srivatsan; Chen, Chun-Hao; Chason, Eric; Bower, Allan
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 13(2016)
• Page Start: A2647
• Page End: A2659
• Publication Date: 2016-09-29
• Subjects: Cahn-Hilliard -- energy dissipation -- interface -- Li-ion battery -- phase boundary -- phase transformation -- Sn anode; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0701613jes
• Languages: English
• ISSNs: 0013-4651

Abstract

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 Li2 Sn5 . 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 Li2 Sn5, the exchange current density for the surface reaction, and the mobility of the Sn/Li2 Sn5 interface are extracted. The implications of finite interface mobility for practical battery electrodes are discussed.