Semi-empirical approach to diffusion kinetics in biphasic materials
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- 作者：So-Yeon Kwon ; Heon-Cheol Shin
- 关键词：Phase transition ; Diffusion coefficient ; Activation energy ; Lithium titanate
- 刊名：Journal of Solid State Electrochemistry
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：20
- 期：3
- 页码：829-835
- 全文大小：1,006 KB
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Heon-Cheol Shin (1)
1. School of Materials Science and Engineering, Pusan National University, Busan, 609-735, Republic of Korea - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Physical Chemistry
Analytical Chemistry
Industrial Chemistry and Chemical Engineering
Characterization and Evaluation Materials
Condensed Matter
Electronic and Computer Engineering - 出版者：Springer Berlin / Heidelberg
- ISSN：1433-0768
文摘
In this study, a novel semi-empirical approach was proposed to analyze the diffusion behaviors of lithium in electrode materials in which phase transitions accompany the intercalation and deintercalation of lithium. The existing methods obtain diffusion coefficients by mechanically fitting electrochemical results to equations that are based on the assumption of single-phase diffusion. In contrast, the method proposed herein quantifies the amount of lithium that participates in a real reaction and numerically obtains the diffusion coefficient value relative to that extent of lithium reaction, thereby achieving practical diffusion behavior quantification. This method was applied to the analysis of lithium diffusion behavior in a Li1+δ [Ti5/3Li1/3]O4 electrode that has a wide voltage plateau (two-phase coexistence region). The apparent diffusion coefficient was estimated as 10−15–10−14 cm2 s−1, and the apparent activation energy was determined as ca. 40 kJ mol−1, which was a similar value as previously reported theoretical values.