کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7744462 | 1498223 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Lithium diffusion coefficient in LiMn2O4 thin films measured by secondary ion mass spectrometry with ion-exchange method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this study, the lithium tracer diffusion coefficient (DLiâ) in spinel-type LiMn2O4 thin films is measured by secondary ion mass spectroscopy (SIMS) in the temperature range from 200 to 550â¯Â°C. An ion-exchange method is employed to prepare diffusion couples consisting of the stable isotopes 6Li and 7Li. The isotope profiles were measured by SIMS analysis to determine DLiâ in the LiMn2O4 films. The DLiâ value was 1.4â¯Ãâ¯10â10â¯cm2/s at 300â¯Â°C and the activation energy was 0.52â¯eV, which is consistent with that of bulk LiMn2O4. The extrapolated value of DLiâ at 25â¯Â°C was on the order of 10â14â¯cm2/s, which is smaller than the chemical diffusion coefficient of LixMn2O4 measured by electrochemical methods. The temperature dependence of DLiâ can be explained by the vacancy diffusion model, in which the extrinsic and intrinsic regions of diffusion exist in the low- and high-temperature regions, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 320, July 2018, Pages 266-271
Journal: Solid State Ionics - Volume 320, July 2018, Pages 266-271
نویسندگان
Naoaki Kuwata, Masakatsu Nakane, Takamichi Miyazaki, Kazutaka Mitsuishi, Junichi Kawamura,