Study on the AC impedance spectroscopy for the Li insertion reaction of LixLa1/3NbO3 at the electrode-electrolyte interface
Study on the AC impedance spectroscopy for the Li insertion reaction of LixLa1/3NbO3 at the electrode-electrolyte interface
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DOI：
10.1021/jp036059k
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发表时间：
2003-09-25
影响因子：
3.3
通讯作者：
Wakihara, M
中科院分区：
文献类型：
--
作者：
Nakayama, M;Ikuta, H;Wakihara, M
下面介绍的是锂插入材料LixLa 1/3 NbO 3的交流阻抗谱研究。根据室温下0.5至5000 Hz频率范围内的复阻抗图，注意到两个半圆，这两个半圆随着成分x而变化。研究了阻抗谱对锂盐浓度和温度的依赖关系，并解释了这两个参数与Butler-Volmer型动力学有关。各种条件下的阻抗谱的演变表明，电化学插入过程中所描述的吸附原子模型，在较高的频率区域观察到的电阻包括吸附和去溶剂化过程伴随着电子转移反应。此外，分配为晶格掺入，或插入过程中的电极表面，与另一个观察在较低的频率区域。
Hereunder presented is an AC impedance spectroscopic study of the lithium-inserted material LixLa1/3NbO3. Two semicircles were noted in accordance with the plots given as the complex impedance in the frequency region of 0.5 to 5000 Hz at room temperature, and these two semicircles made variation accompanied with the composition x. The dependence of the impedance spectra on the lithium salt concentration and temperature was examined, and it is explained that these two semicircles were in relation to the Butler-Volmer type kinetics. The evolution of impedance spectra for various conditions reveals that the electrochemical insertion process is described in terms of an adatom model; the resistance observed at a higher frequency region includes the adsorption and desolvation process accompanied with electron-transfer reaction. Furthermore, assignment as lattice incorporation, or insertion process at the electrode surface, is made with the other one observed in the lower frequency region.