High power performance of nano-LiFePO4/C cathode material synthesized via lauric acid-assisted solid-state reaction |
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Authors: | Fuquan Cheng Wang Wan Zhuo Tan Youyuan Huang Henghui Zhou Jitao Chen Xinxiang Zhang |
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Affiliation: | aCollege of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China;bCollege of Chemistry, Xiangtan University, Xiangtan, Hunan 411105, PR China |
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Abstract: | A nano-LiFePO4/C composite has been directly synthesized from micrometer-sized Li2CO3, NH4H2PO4, and FeC2O4·2H2O by the lauric acid-assisted solid-state reaction method. The SEM and TEM observations demonstrate that the synthesized nano-LiFePO4/C composite has well-dispersed particles with a size of about 100–200 nm and an in situ carbon layer with thickness of about 2 nm. The prepared nano-LiFePO4/C composite has superior rate capability, delivering a discharge capacity of 141.2 mAh g−1 at 5 °C, 130.9 mAh g−1 at 10 C, 121.7 mAh g−1 at 20 °C, and 112.4 mAh g−1 at 30 °C. At −20 °C, this cathode material still exhibits good rate capability with a discharge capacity of 91.9 mAh g−1 at 1 °C. The nano-LiFePO4/C composite also shows excellent cycling ability with good capacity retention, up to 100 cycles at a high current density of 30 °C. Furthermore, the effect of lauric acid in the preparation of nano-LiFePO4/C composite was investigated by comparing it with that of citric acid. The SEM images reveal that the morphology of the LiFePO4/C composite transformed from the porous structure to fine particles as the molar ratio of lauric acid/citric acid increased. |
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Keywords: | Lithium-ion batteries LiFePO4/C composite Lauric acid Solid-state reaction |
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