Investigation of charge transfer kinetics of Li-Intercalation in LiFePO4
Investigation of charge transfer kinetics of Li-Intercalation in LiFePO4
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DOI：
10.1016/j.jpowsour.2015.04.103
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发表时间：
2015-08-15
影响因子：
9.2
通讯作者：
Michaelis, A.
中科院分区：
文献类型：
--
作者：
Heubner, C.;Schneider, M.;Michaelis, A.
最近的研究指出了经典Butler-Volmer动力学和嵌锂在主体材料中的电荷转移动力学之间的矛盾。在这项工作中，锂嵌入LiFePO 4的电荷转移动力学研究，使用电流控制的电化学阻抗谱与变化的振幅。结果指出，欧姆和扩散对总过电位有显着影响，该总过电位通常从恒流充电放电实验中提取，以确定塔菲尔图、交换电流和电荷转移系数。通过精确分离活化过电位和总过电位，证明了LiFePO_4的嵌锂电荷转移动力学完全符合Butler-Volmer方程。(c)2015爱思唯尔B. V.保留所有权利。
Recent studies point out contradictions between classical Butler-Volmer kinetics and the charge transfer kinetics of lithium intercalation in host materials. In this work the charge transfer kinetics of lithium intercalation in LiFePO4 are investigated using current controlled electrochemical impedance spectroscopy with varying amplitudes. The results point out a significant impact of ohmic and diffusion contributions to the total overpotential which is normally extracted from constant current charging discharging experiments to determine Tafel-plots, exchange currents and charge transfer coefficients. By the accurate separation of the activation overpotential from the total overpotential the authors are able to show that the charge transfer kinetics of lithium intercalation in LiFePO4 perfectly obey the Butler-Volmer equation. (c) 2015 Elsevier B.V. All rights reserved.