Morphology control and electrochemical properties of nanosize LiFePO<inf>4</inf>cathode material synthesized by co-precipitation combined with in situ polymerization
- Publication Type:
- Journal Article
- Journal of Alloys and Compounds, 2011, 509 (3), pp. 1040 - 1044
- Issue Date:
Nanosize carbon coated LiFePO4cathode material was synthesized by in situ polymerization. The as-prepared LiFePO4cathode 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 LiFePO4consists of primary particles (40-50 nm) and agglomerated secondary particles (100-110 nm). Each particle is evenly coated with an amorphous carbon layer, which has a thickness around 3-5 nm. The electrochemical properties were examined by cyclic voltammetry and charge-discharge testing. The as-prepared LiFePO4can deliver an initial discharge capacity of 145 mAh/g, 150 mAh/g, and 134 mAh/g at 0.2 C, 1 C, and 2 C rates, respectively, and exhibits excellent cycling stability. At a higher C-rate (5 C) a slight capacity loss could be found. However after being charge-discharge at lower C-rates, LiFePO4can be regenerated and deliver the discharge capacity of 145 mAh/g at 0.2 C. © 2010 Elsevier B.V. All rights reserved.
Please use this identifier to cite or link to this item: