Experimental Calibration of a Cahn-Hilliard Phase-Field Model for Phase Transformations in Li-Sn Electrodes

被引：5

作者：

Hulikal, Srivatsan ^{[1
]}

Chen, Chun-Hao ^{[1
]}

Chason, Eric ^{[1
]}

Bower, Allan ^{[1
]}

机构：

[1] Brown Univ, Sch Engn, Providence, RI 02912 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2016年 / 163卷 / 13期

关键词：

LITHIUM-TIN SYSTEM; IN-SITU MEASUREMENTS; ELECTROCHEMICAL LITHIATION; LIFEPO4; NANOPARTICLES; NEGATIVE ELECTRODES; ION BATTERIES; DIFFUSION; SILICON; SEPARATION; EVOLUTION;

D O I：

10.1149/2.0701613jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

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. (C) 2016 The Electrochemical Society. All rights reserved.

引用

页码：A2647 / A2659

页数：13

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