Abstract
Olivine LiFePO4/C nanocomposite cathode materials with small-sized particles and a unique electrochemical performance were successfully prepared by a simple solid-state reaction using oxalic acid and citric acid as the chelating reagent and carbon source. The structure and electrochemical properties of the samples were investigated. The results show that LiFePO4/C nanocomposite with oxalic acid (oxalic acid: Fe2+= 0.75:1) and a small quantity of citric acid are single phase and deliver initial discharge capacity of 122.1 mAh/g at 1 C with little capacity loss up to 500 cycles at room temperature. The rate capability and cyclability are also outstanding at elevated temperature. When charged/discharged at 60 °C, this materials present excellent initial discharge capacity of 148.8 mAh/g at 1 C, 128.6 mAh/g at 5 C, and 115.0 mAh/g at 10 C, respectively. The extraordinarily high performance of LiFePO4/C cathode materials can be exploited suitably for practical lithium-ion batteries.
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Acknowledgements
This work was supported by the Nature Science Foundation of Xinjiang Province (Grant Nos. 200821121 and 200821122), the National Natural Science Foundation of China (Grant Nos. 20866009 and 20861008), Technological People Service Corporation (2009GJG40028), and the Science and technology Foundation of Urumqi (y08231006).
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Wang, X., Huang, Y., Jia, D. et al. Preparation and characterization of high-rate and long-cycle LiFePO4/C nanocomposite as cathode material for lithium-ion battery. J Solid State Electrochem 16, 17–24 (2012). https://doi.org/10.1007/s10008-010-1269-4
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DOI: https://doi.org/10.1007/s10008-010-1269-4