Low temperature synthesis of graphene-wrapped LiFePO4 nanorod cathodes by the polyol method

• Published in: Journal of materials chemistry 2012-01, Vol.22 (33), p.17215-17221
• Main Authors: Oh, Sei Woon, Huang, Zhen-Dong, Zhang, Biao, Yu, Yang, He, Yan-Bing, Kim, Jang-Kyo
• Format: Article
• Language: English
• ISSN: 0959-9428; 1364-5501
• DOI: 10.1039/c2jm33615d

A facile, low temperature polyol method is developed to synthesize graphene-wrapped, rod-shaped LiFePO 4 (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 °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. A facile, low temperature polyol method is developed to synthesize graphene-wrapped, rod-shaped LiFePO 4 (LFP) cathode materials. The as-prepared graphene-wrapped LFP rods exhibit excellent rate capability and cyclic stability due to its short Li-ion diffusion path and significantly improved electrical conductivity.