Submicron-Sized Clusters of LiFePO4-C Nanoparticles for Lithium-Ion Battery Cathodes
Authors: Xu, Yunlong; Tao, Lili; Du, Guodong; Guo, Zaiping; Xu, Yonggang; Zhang, Shucheng
Source: Advanced Science Letters, Volume 4, Numbers 11-12, November 2011 , pp. 3523-3527(5)
Publisher: American Scientific Publishers
Abstract:Submicron-sized clusters of LiFePO4-C nanoparticles were synthesized using a rheological phase reaction method. X-ray diffraction (XRD), scanning electron microscope (SEM), and high resolution transmission electron microscope (HRTEM) observations show that the as-prepared LiFePO4-C composite has good crystallinity consisting of submicron-sized clusters of carbon-coated LiFePO4 nanoparticles with size of around 50 nm. Both the graphite and disordered carbon are observed in the LiFePO4-C from the Raman spectroscopy and a low intensity ratio of the D band to that of the G band (ID/IG = 0.687) is obtained, confirming the high electronic conductivity of this material. The second cycle discharge capacities are 169.6, 131.4, and 95.6 mAh · g-1 at 0.1, 1.0, and 5.0 C, respectively. Excellent cycling performance with a discharge capacity of 80.9 mAh · g-1 is still maintained even at a high current density of 10 °C. Our results suggest that this material is a promising cathode material for lithium ion batteries.
Document Type: Research article
Publication date: 2011-11-01
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