Preparation and Investigation on Lattice Distortion and Electrochemical Performances of Li0.95Na0.05FePO4/C

Autor:	Qinqin Chang, Wen-lou Wang, Xiaodong Xin, Hongju Li
Rok vydání:	2012
Předmět:	Matrix (chemical analysis) Diffraction Materials science Scanning electron microscope Rietveld refinement Doping Lattice distortion Analytical chemistry Particle size Physical and Theoretical Chemistry Electrochemistry
Zdroj:	Chinese Journal of Chemical Physics. 25:429-433
ISSN:	2327-2244 1674-0068
DOI:	10.1088/1674-0068/25/04/429-433
Popis:	Na+ doped sample Li0.95Na0.05FePO4 was prepared through solid state method. Structure characterization shows Na+ is successfully introduced into the LiFePO4 matrix. Scanning electron microscopy shows the particle size mainly ranges in 1–3 μm. X-ray diffraction Rietveld refinement demonstrates lattice distortion with an increased cell volume. As one cathode material, it has a discharge capacity of 150 mAh/g at 0.1 C rate. The material exhibits a capacity of 109 and 107 mAh/g at 5 and 7.5 C respectively. When cycled at 1 and 5 C, the material retains 84% (after 1000 cycles) and 86% (after 350 cycles) of the initial discharge capacity respectively indicating excellent structure stability and cycling performance. Na+ doping enhances the electrochemical activity especially the cycle performance effectively.
Databáze:	OpenAIRE
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