| 库仑法和电化学阻抗法测量LiFePO4锂离子扩散系数 |
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| 引用本文： | 王连亮,马培华,张琨,高成花,阎春燕.库仑法和电化学阻抗法测量LiFePO4锂离子扩散系数[J].盐湖研究,2009,17(3):52-55. |
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| 作者姓名： | 王连亮 马培华 张琨 高成花 阎春燕 |
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| 作者单位： | 1. 中国科学院青海盐湖研究所,青海,西宁,810008;中国科学院研究生院,北京,100039
2. 中国科学院青海盐湖研究所,青海,西宁,810008 |
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| 基金项目： | 青海省重点科技攻关项目 |
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| 摘 要： | 库仑法和电化学阻抗法是测量锂离子扩散系数有效的测量手段。以实验室自制的LiFePO4为实验电池正极材料,介绍如何用库仑法和阻抗法测试并计算电极材料的锂离子扩散系数。库仑法计算得到锂离子扩散系数由Li1-xFePO4(x=0)的9.6×10-9cm2.s-1变化为Li1-xFePO4(x=0.7)的1.1×10-11cm2.s-1。用阻抗法的两种模型,分别计算了Li1-xFePO4(x=0.65)的电池材料的锂离子扩散系数,结果分别是8.5×10-11cm2.s-1和3.1×10-12cm2.s-1。三种方法的计算结果接近。
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| 关 键 词： | 库仑滴定 电化学阻抗 锂离子扩散系数 正极材料 锂离子电池 |
Determination of Li-ion Diffusion Coefficient via Coulometric Titration and Electrochemical Impendence Method |
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| WANG Lian-liang,MA Pei-hu,ZHANG Kun,GAO Cheng-hu,YAN Chun-yan.Determination of Li-ion Diffusion Coefficient via Coulometric Titration and Electrochemical Impendence Method[J].Journal of Salt Lake Research,2009,17(3):52-55. |
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| Authors: | WANG Lian-liang MA Pei-hu ZHANG Kun GAO Cheng-hu YAN Chun-yan |
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| Institution: | WANG Lian-liang, MA Pei-hua, ZHANG Kun, GAO Cheng-hua, YAN Chun-yan ( 1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China, 2. The Graduate University of Chinese Academy of Sciences, Beijing 100039, China) |
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| Abstract: | Li-ion diffusion coefficient can be effectively obtained from coulometric titration and electrochemical impendance method. The paper takes self-made LiFePO4 as an example to calculate the Li-ion diffusion coefficient by using coulometric titration and electrochemical impendence method. The results of coulometric titration shows that it varies from 9.6 x 10-gcm2·s-1 to 1.1 × 10-11 cm2 ·s-1 as a function of x in Li1-xFePO4 when xequals 0 to 0. 7. Based on two different models of electrochemical impendance spectroscopy, the paper calculates the Li-ion diffusion coefficient of Li1-xFePO4 （x = 0. 65 ） and the results are 8.5 x 10-11 cm2·s-1 and 3.1×l0-12cm2·s-1 respectively. Three results are in good agreement. |
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| Keywords: | Coulometric titration Electrochemical impendence Li-ion diffusion coefficient Cathode material Lithium ion battery |
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