کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7990046 | 1516125 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetic behavior of Fe nanoparticles driven by phase transition of FeF3
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Typical electrodes for Li-ion batteries such as LiCoO2 operate via the insertion/de-insertion of Li ions; innovative electrodes that undergo conversion reactions have been developed to meet the requirement for greater capacities. However, batteries operating via a conversion process suffer from degradation over repeated cycles and from hysteresis in charge/discharge profiles, and their mechanism remains a topic of ongoing debate. We prepare the FeF3/C composite electrode as a model electrode to address the conversion mechanism. Magnetization measurements provide direct evidence of superparamagnetic behaviorâFe nanoparticles (NPs) are magnetized similarly to a paramagnet under an external fieldâafter the discharge process. We quantify the size of the Fe NPs, and find a correlation between an increased Fe particle size and a decrease in discharge capacity. These findings would pave the strategy based on control of the size of Fe NPs for realizing a favorable cycling performance. Indeed, improvement of an electrolyte goes toward higher capacities after 30 cycles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 769, 15 November 2018, Pages 539-544
Journal: Journal of Alloys and Compounds - Volume 769, 15 November 2018, Pages 539-544
نویسندگان
Tsuyoshi Takami, Keitaro Matsui, Hiroshi Senoh, Noboru Taguchi, Masahiro Shikano, Hikari Sakaebe, Toshiharu Fukunaga,