标题: Revealing the phase evolution and lithium diffusion in the liquid Sn-Sb electrode

作者: Li, WM (Li, Wenmiao); Shi, H (Shi, Hao); Du, KF (Du, Kaifa); Liu, W (Liu, Wei); Yin, HY (Yin, Huayi); Jiang, K (Jiang, Kai); Wang, DH (Wang, Dihua)

来源出版物: JOURNAL OF ELECTROANALYTICAL CHEMISTRY 卷: 901 文献号: 115719 DOI: 10.1016/j.jelechem.2021.115719 出版年: NOV 15 2021

摘要: Understanding the phase evolution and mass transfer kinetics at the liquid metal/molten salt interface is of significance for developing liquid metal electrodes, but it is very challenging due to the involving harsh experimental conditions of high temperature and active metals. Herein, an in-situ observation device is set up to monitor the phase evolution of liquid Sn-Sb alloy during its alloying with Li under electrochemical polarization at 550 degrees C, and a thermodynamic model is used to describe the growth process of solid Li3Sb layer in the Sn-Sb alloy and reveal the correlation of the phase evolution with the discharge equilibrium potential. Using the coulombic titration method, the diffusion coefficient of Li in liquid Sn-Sb alloy is calculated. The diffusion coefficient of Li in liquid Sn-Sb alloy at 550 degrees C decreases from 13.9 x 10(-4) to 1.02 x 10(-4) cm(2)/s when the Li concentration ranges from 0.8 to 20.5 mol.% vs. Sb. Overall, this paper reveals the phase evolution of liquid Sb-Sn electrode during the lithiation process and provides a general method to measure metal diffusion coefficients in liquid metal electrodes.

文献类型: Article

作者关键词: Liquid metal battery; Phase evolution; Coulometric titration; Thermodynamics; Diffusion coefficient

地址: [Li, Wenmiao; Shi, Hao; Du, Kaifa; Liu, Wei; Yin, Huayi; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

[Li, Wenmiao; Shi, Hao; Du, Kaifa; Liu, Wei; Yin, Huayi; Wang, Dihua] Wuhan Univ, Int Cooperat Base Sustainable Utilizat Resources, Wuhan 430072, Peoples R China.

[Jiang, Kai] Huazhong Univ Sci & Technol, Coll Mat Sci & Engn, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Hubei, Peoples R China.

通讯作者地址: Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

Wang, DH (通讯作者)，Wuhan Univ, Int Cooperat Base Sustainable Utilizat Resources, Wuhan 430072, Peoples R China.

电子邮件地址: wangdh@whu.edu.cn

影响因子：4.464