Preparation of graphene based on liquid phase exfoliation and its application on LiFePO<sub>4</sub> electrode for lithium ion battery
High-crystallinity and low-defect graphene nanosheets with nano pores were prepared from natural flake graphite <i>via</i> high-pressure homogenization liquid phase exfoliation method.The morphology and structure of as-prepared samples were investigated with scanning electron microscopy,...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2020-11-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.001162 |
| Summary: | High-crystallinity and low-defect graphene nanosheets with nano pores were prepared from natural flake graphite <i>via</i> high-pressure homogenization liquid phase exfoliation method.The morphology and structure of as-prepared samples were investigated with scanning electron microscopy,transmission electron microscopy, atomic force microscope, X-ray diffraction and Raman spectroscopy.The electrochemical performance was performed using coin cells assembled in an argon-filled glovebox.It was found that the wrinkled graphene sheets with nanoholes consisted of 5 layers,which had high crystallinity.As conductive additives for LiFePO<sub>4</sub> cathode,graphene constructed fast pathway for electron and ion transport in the bulk electrode,resulting in superior rate performance.Electrochemical tests showed that the electrode achieved a high reversible capacity of 90 mAh/g at 10 C rate;in addition,the discharge capacity achieved 90 mAh/g when charging and discharging at 5 C rate for 200 cycles,maintaining 100% capacity retention.The approach preparing graphene is facile,which can be suitable for industrial scale production of graphene materials. |
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| ISSN: | 1001-4381 1001-4381 |