Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 33, Pages 17215-17221Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm33615d
Keywords
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Funding
- Research Grants Council [614010, 613811]
- Innovation and Technology Fund of Hong Kong SAR [GHP/028/08SZ]
- NanoTechnology Program of the School of Engineering, HKUST
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A facile, low temperature polyol method is developed to synthesize graphene-wrapped, rod-shaped LiFePO4 (LFP) cathode materials. The effects of reaction temperature and reduced graphene oxide (RGO) on the morphology and electrochemical performance of RGO/LFP composites are studied. The RGO/LFP containing 10 wt% precursor GO and synthesized at 220 degrees C presents the best electrochemical properties, namely discharge specific capacities of 164.1, 156.7 and 121.5 mA h g(-1) after 100 cycles with capacity retention ratios of 99.0, 97.9 and 98.6% at 0.1 C, 1 C and 10 C, respectively. These values are considered among the highest reported in the literature for LFP cathodes with similar carbon additives. The improved electronic conduction and reduced charge transfer resistance arising from the RGO sheets are responsible for the excellent electrochemical properties.
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