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A novel method to synthesize LiVPO4F/C composite materials and its electrochemical Li-intercalation performances |
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| Authors: | Qian Zhang Letong Liu Jiqiong Jiang Jian Wang |
| Institution: | a Department of Biological and Chemical Engineering, Guangxi University of Technology, Liuzhou 545006, PR China b Department of Material and Chemical Engineering, Guilin University of Technology, Guilin 541004, PR China c Guangxi Key Laboratory of Environmental Engineering, Protection and Assessment, Guilin University of Technology, Guilin 541004, PR China |
| Abstract: | Triclinic LiVPO4F/C composite materials were prepared from a sucrose-containing precursor by one-step heat treatment. As-prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical measurements. XRD studies showed that Li3PO4 impurity phase appeared in the sample synthesized at 600 °C and pure LiVPO4F samples could be obtained when the sintered temperature was higher than 650 °C. The sample synthesized at 650 °C presents the highest initial discharge capacity of 132 mAh g−1 at 0.2 C rate, and exhibited better cycling stability (124 mAh g−1 at 50th cycle at 0.2 C rate) and better rate capability (100 mAh g−1 at 50th cycle under 1 C rate) in the voltage range 3.0-4.4 V. |
| Keywords: | Inorganic compounds Chemical synthesis X-ray diffraction |
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