嵌入化合物电极的电化学阻抗谱: 模型与理论模拟

引用本文: 徐守冬, 庄全超, 史月丽, 朱亚波, 邱祥云, 孙智. 嵌入化合物电极的电化学阻抗谱: 模型与理论模拟[J]. 物理化学学报, 2011, 27(10): 2353-2359. doi: 10.3866/PKU.WHXB20111004 shu

Citation: XU Shou-Dong, ZHUANG Quan-Chao, SHI Yue-Li, ZHU Ya-Bo, QIU Xiang-Yun, SUN Zhi. Electrochemical Impedance Spectra of Intercalation Compound Electrodes: Models and Theoretical Simulations[J]. Acta Physico-Chimica Sinica, 2011, 27(10): 2353-2359. doi: 10.3866/PKU.WHXB20111004 shu

嵌入化合物电极的电化学阻抗谱: 模型与理论模拟

基金项目:
中央高校基本科研业务费专项资金(2010LKHX03, 2010QNB04, 2010QNB05) (2010LKHX03, 2010QNB04, 2010QNB05)

中国矿业大学科技攀登计划(ON090237) (ON090237)

江苏省自然科学研究基金(BK2008129)资助项目 (BK2008129)

摘要: 建立了单个嵌入化合物颗粒、混合颗粒、厚度均匀多孔电极层以及非均匀、多层多孔电极层的理论模型, 模拟得出了上述模型的相对应电化学阻抗谱(EIS)特征. 结果表明, 单个颗粒和混合颗粒表现出相似的阻抗谱特征, 均由高频区域内与锂离子通过固体电解质相界面(SEI)膜过程相关的R_SEI‖C_SEI半圆, 与电荷传递过程相关的R_ct‖C_dl半圆以及与锂离子在固体颗粒内部的扩散相关的斜线三部分组成. 对于非均匀、多层多孔嵌入电极而言, 一个新奇的现象就是在阻抗谱中会出现三个半圆, 影响第三个半圆出现并形成的因素主要为电极中的颗粒尺寸分布以及电极层的厚度分布, 也就是说电极片中出现不同尺寸分布的颗粒以及形成薄厚两种电极层的时候, 容易导致阻抗谱中出现第三个半圆.

关键词:

English

Electrochemical Impedance Spectra of Intercalation Compound Electrodes: Models and Theoretical Simulations

1.
1. Li-ion Batteries Laboratory, School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, P. R. China;
2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, P. R. China
Received Date: 04 May 2011
Available Online: 27 September 2011
Fund Project:
中央高校基本科研业务费专项资金(2010LKHX03, 2010QNB04, 2010QNB05)

中国矿业大学科技攀登计划(ON090237)

江苏省自然科学研究基金(BK2008129)资助项目

Abstract: Single intercalation particles, mixed particles, homogeneous porous electrodes and nonhomogeneous, multilayered porous electrode models are proposed in this paper. Some peculiar features of impedance spectra were simulated using the above-mentioned models. The results reveal that the features of impedance spectra of the single intercalation particle and the mixed particles are the same and the features consist of lithium ion migration through the solid electrolyte interphase (SEI) film (R_SEI‖C_SEI semicircle), an electron and ion transfer process (R_ct‖C_dl semicircle), and a finite-diffusion Warburg element. For the nonhomogeneous, multilayered porous electrodes model, a peculiar feature of impedance spectra is that a new arc appears in the Nyquist plot. A detailed analysis revealed that a different particle size distribution could lead to the appearance of a new arc and a different layer distribution (a thicker layer and a thinner layer), which could lead to a well-developed semicircle.

Key words:

Lithium ion battery
/ Intercalation compound
/ Nonhomogeneous
/ Porous electrode
/ Electrochemical impedance spectroscopy

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沈阳化工大学材料科学与工程学院沈阳 110142

嵌入化合物电极的电化学阻抗谱: 模型与理论模拟

English

Electrochemical Impedance Spectra of Intercalation Compound Electrodes: Models and Theoretical Simulations

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

嵌入化合物电极的电化学阻抗谱: 模型与理论模拟

English

Electrochemical Impedance Spectra of Intercalation Compound Electrodes: Models and Theoretical Simulations

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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