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Morphology control and electrochemical properties of nanosize LiFePO 4 cathode material synthesized by co-precipitation combined with in situ polymerization

Morphology control and electrochemical properties of nanosize LiFePO 4 cathode material synthesized by co-precipitation combined with in situ polymeri

Morphology control and electrochemical properties of nanosize LiFePO 4 cathode material synthesized by co-precipitation combined with in situ polymerization  
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Nanosize carbon coated LiFePO4 cathode material was synthesized by in situ polymerization. The as-prepared LiFePO4 cathode material was systematically characterized by X-ray diffraction, thermogravimetric–differential scanning calorimetry, X-ray photo-electron spectroscopy, field-emission scanning electron microscopy, and transmission electron microscopy techniques. Field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) images revealed that the morphology of the LiFePO4 consists of primary particles (40–50nm) and agglomerated secondary particles (100–110nm). Each particle is evenly coated with an amorphous carbon layer, which has a thickness around 3–5nm. The electrochemical properties were examined by cyclic voltammetry and charge–discharge testing. The as-prepared LiFePO4 can deliver an initial discharge capacity of 145mAh/g, 150mAh/g, and 134mAh/g at 0.2C, 1C, and 2C rates, respectively, and exhibits excellent cycling stability. At a higher C-rate (5C) a slight capacity loss could be found. However after being charge–discharge at lower C-rates, LiFePO4 can be regenerated and deliver the discharge capacity of 145mAh/g at 0.2C.
Journal: Journal of Alloys and Compounds - J ALLOYS COMPOUNDS , vol. 509, no. 3, pp. 1040-1044, 2011
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