کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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180124 | 459371 | 2011 | 4 صفحه PDF | دانلود رایگان |
Carbon-coated Na2FePO4F is synthesized by a simple solid-state method with ascorbic acid as carbon source. Structural characterization of Na2FePO4F by synchrotron X-ray diffraction, scanning/transmission electron microscopy, and Raman spectroscopy reveals that ascorbic acid effectively suppresses the particle growth of Na2FePO4F, forming the nano-sized carbon coated materials. Electrode performance of Na2FePO4F for rechargeable sodium batteries is also examined. The carbon-coated Na2FePO4F sample (1.3 wt% carbon) delivers initial discharge capacity of 110 mAh g-1 at a rate of 1/20 C (6.2 mA g-1) with well-defined voltage plateaus at 3.06 and 2.91 V vs. Na metal. The sample also shows acceptable capacity retention and rate capability as the positive electrode materials for rechargeable Na batteries, which is operable at room temperature.
► Synthesis of carbon coated Na2FePO4F by conventional solid-state method with ascorbic acid.
► Structural characterizations of the carbon coated Na2FePO4F by Rietveld method, Raman spectroscopy, and scanning/transmission electron microscopy.
► Electrode performance of the carbon coated Na2FePO4F as positive electrodes for reversible sodium batteries.
Journal: Electrochemistry Communications - Volume 13, Issue 11, November 2011, Pages 1225–1228