2014年3月
Tracer diffusion coefficients of lithium ion in LiMn2O4 measured by neutron radiography
SOLID STATE IONICS
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- 巻
- 256
- 号
- 開始ページ
- 93
- 終了ページ
- 96
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.ssi.2014.01.013
- 出版者・発行元
- ELSEVIER SCIENCE BV
Lithium isotope diffusion profiles in the cathode material LiMn2O4 have been measured by using neutron radiography technique to determine the tracer diffusion coefficients D* in the temperature range of 300 C to 800 degrees C. Arrhenius plot of the diffusion coefficient shows a bend around 550 degrees C. At the lower temperature region, the activation energy of the diffusion coefficient is obtained as 0.52 eV, which is essentially consistent with that of the reported NMR study. However, the extrapolated diffusion coefficient down to room temperature is considerably smaller than the chemical diffusion coefficients obtained by electrochemical methods. On the other hand, high-temperature activation energy of 1.11 eV is relatively close to the previously investigated Li4Ti5O12, which also exhibits spinel-type structure and possesses the similar diffusion path via the 16c site. Within the present study, sintering temperature at the LiMn2O4 sample preparation does not affect the tracer diffusion coefficient values. (C) 2014 Published by Elsevier B.V.
- リンク情報
- ID情報
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- DOI : 10.1016/j.ssi.2014.01.013
- ISSN : 0167-2738
- eISSN : 1872-7689
- Web of Science ID : WOS:000332354100014