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Enhanced electrochemical properties of LiFePO4/C synthesized with two kinds of carbon sources, PEG-4000 (organic) and Super p (inorganic).
- Source :
-
Ceramics International . Jul2014, Vol. 40 Issue 6, p8439-8444. 6p. - Publication Year :
- 2014
-
Abstract
- Abstract: Olivine structured LiFePO4/C cathode was synthesized via a freeze-drying route and followed by microwave heating with two kinds of carbon sources: PEG-4000 (organic) and Super p (inorganic). XRD patterns indicate that the as-prepared sample has an olivine structure and carbon modification does not affect the structure of the sample. Image of SEM shows a uniform and optimized particles size, which greatly improves the electrochemical properties. TEM result reveals the amorphous carbon around the surface of the particles. At a low rate of 0.1C, the LiFePO4/C sample presents a high discharge capacity of 157.8mAhg−1 which is near the theoretical capacity (170mAhg−1), and it still attains to 149.1mAhg−1 after 200 cycles. It also exhibits an excellent rate capacity with high discharge capacities of 143.2mAhg−1, 137.5mAhg−1, 123.7mAhg−1 and 101.6mAhg−1 at 0.5C, 1.0C, 2.0C and 5.0C, respectively. EIS results indicate that the charge transfer resistance of LiFePO4 decreases greatly after carbon coating. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 40
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 95127095
- Full Text :
- https://doi.org/10.1016/j.ceramint.2014.01.054