کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7993467 | 1516151 | 2018 | 29 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Concentration-controlled morphology of LiFePO4 crystals with an exposed (100) facet and their enhanced performance for use in lithium-ion batteries
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
A study of the morphology-controlled growth of olivine LiFePO4 particles by varying the precursor concentration via a facile solvothermal synthesis was carried out. The influences of the solvent product on the structure, morphology and electrochemical performance were systematically investigated by X-ray diffraction, scanning/transmission electron microscopy and charge-discharge tests. It was found that as the precursor concentration increased from 0.15â¯M to 0.90â¯M, the morphology of the LiFePO4 particles changed from spindle-shape to plate-type and then to a hierarchical club-shaped structure, and the predominantly exposed facet of all LiFePO4 samples was (100). The shape of LiFePO4 particles remained as nanoplates while synthesized at different reaction temperatures and time with a precursor concentration of 0.30â¯M. This in turn confirms that the precursor concentration plays an important role in controlling the morphology of LiFePO4 particles. To illustrate the phenomenon caused by variations in the concentration, a possible morphological transformation mechanism was demonstrated. With the optimal precursor concentration of 0.3â¯M, the obtained LiFePO4 shows square nanoplates with uniform particle size and carbon coating, resulting in excellent electrochemical performance: a discharge capacity of 157.3 mAh/g at 1â¯C with 95% capacity retention after 1000 cycles and a high-rate capacity of 140.8 mAh/g at 10â¯C. This facile and precursor concentration-controlled solvothermal method is anticipated to be a guide for large-scale cathode material manufacturing and can fulfil the requirements for its application to high-power lithium-ion batteries.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 743, 30 April 2018, Pages 763-772
Journal: Journal of Alloys and Compounds - Volume 743, 30 April 2018, Pages 763-772
نویسندگان
Xiaopeng Huang, Yaochun Yao, Feng Liang, Yongnian Dai,