کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
188226 459656 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical properties of nanocrystalline LiFexMn2−xO4 (x = 0.2–1.0) cathode particles prepared by ultrasonic spray pyrolysis method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemical properties of nanocrystalline LiFexMn2−xO4 (x = 0.2–1.0) cathode particles prepared by ultrasonic spray pyrolysis method
چکیده انگلیسی

The nanocrystalline LiFexMn2−xO4 (x = 0.2–1.0) particles were prepared by ultrasonic spray pyrolysis method using nitrate salts of ingredients at 800 °C in air atmosphere. Particle properties were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy. Besides, cyclic voltammetry and galvanostatic tests were performed to investigate the effects of the iron substituent amount on electrochemical behavior. Particle characterization studies show that nanocrystalline particles have spinel structure and they are in submicron size range with spherical morphology. The lowest iron doped sample (LiFe0.2Mn1.8O4) exhibits 117 mAh g−1 cumulative discharge capacity at 0.5 C and 88% capacity retention for 4 V plateau after 50 cycles. At higher iron concentrations, substituent tends to occupy the 8a tetrahedral sites, which prevent the lithium transport in the lattice during charge–discharge process. Increasing of the iron amount in the spinel structure causes the deterioration of the electrochemical performance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 76, 1 August 2012, Pages 368–374
نویسندگان
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