Synthesis and Performance of LiFePO<sub>4</sub>-C/Graphene Composite
LiFePO<sub>4</sub>-C/graphene composite was successfully prepared by a facile approach of grinding, ultrasonic dispersion, stirring and drying and used as the cathode material for lithium-ion batteries.The structure and morpholgy of as-prepared LiFePO<sub>4</sub>-C/graphene c...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2018-04-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jam.biam.ac.cn/CN/Y2018/V46/I4/43 |
| Summary: | LiFePO<sub>4</sub>-C/graphene composite was successfully prepared by a facile approach of grinding, ultrasonic dispersion, stirring and drying and used as the cathode material for lithium-ion batteries.The structure and morpholgy of as-prepared LiFePO<sub>4</sub>-C/graphene composite material was characterized with transmission electron microscopy,scanning electron microscopy, X-ray diffraction and Raman spectroscopy,and the electrochemical performance was tested using coin cells assembled in an argon-filled glovebox. SEM images show that in the as-prepared material, graphene nanoflakes are adhered on the surface of LiFePO<sub>4</sub>-C particles, and uniformly dispersed in the composite material forming an effective 3D conducting network. Electrochemical tests show that after adding 2% of graphene, rate and cycling performances of the LiFePO<sub>4</sub>-C/graphene composite material are obviously improved. For the rate performance, a high reversible capacity of 94.2mAh·g<sup>-1</sup> is achieved at 5C rate,which is more than 2.53 times higher than that of pristine LiFePO<sub>4</sub>-C; For cycling performance, the composite material shows a low capacity decay rate of 9.6% when cycles under 1C rate for 100 times,which is lower than pure LiFePO<sub>4</sub>-C (43.5%). The electrochemical performance enhancement can be mainly ascribed to the effective 3D conducting network formed by graphene nanoflakes with superior conductivity. |
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| ISSN: | 1001-4381 1001-4381 |