کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8002766 | 1516314 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A monodispersed nano-hexahedral LiFePO4 with improved power capability by carbon-coatings
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
A monodispersed nano-sized hexahedral LiFePO4 of regular angularity was prepared through hydrothermal process. Different carbon precursors were employed to create carbon-coating layers onto the nano-particles to improve the electrochemical performances of the material. Structure and morphology of the LiFePO4 material without and with carbon-coating layer were studied using a combination of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. It confirms that carbon-coating plays an important role inhibiting the agglomeration of the nanoparticles. A uniform carbon-coating layer of higher graphitization degree was developed on the LiFePO4 particles with sucrose precursor. The electrode exhibits discharge capacities of 148.3 mA h gâ1, 138.7 mA h gâ1, 117.8 mA h gâ1 at 0.1 C, 1 C and 10 C, respectively. Very close Li ion diffusion coefficient of around 8 Ã 10â14 cm2 sâ1 for all the LiFePO4/C composites with different carbon sources implies that the improved power capability is mainly attributed to the small particle size and low contact resistance between the LiFePO4 nanoparticles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 579, 5 December 2013, Pages 377-383
Journal: Journal of Alloys and Compounds - Volume 579, 5 December 2013, Pages 377-383
نویسندگان
Jing Li, Qunting Qu, Longfei Zhang, Li Zhang, Honghe Zheng,