锂氟电池用高倍率氟化多壁碳纳米管正极材料

陈珑; 孙晓刚; 邱治文; 蔡满园

锂氟电池用高倍率氟化多壁碳纳米管正极材料

南昌大学机电工程学院, 江西南昌 330031

基金项目: 江西省教育厅（KJLD13006）；江西省科技厅科研项目（20142BBE50071）.

详细信息

作者简介:
陈珑,硕士研究生.E-mail:1083192075@qq.com

通讯作者:
孙晓刚,教授.E-mail:xiaogangsun@163.com

中图分类号: TQ127.1⁺1
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- 文章访问数: 503
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- 被引次数: 0
出版历程
- 收稿日期: 2018-04-28
- 录用日期: 2018-08-30
- 修回日期: 2018-07-29
- 刊出日期: 2018-08-28

Fluorinated multiwall carbon nanotubes for high rate lithium ion primary batteries

College of Mechantronics Engineering, Nanchang University, Nanchang 330031, China

Funds: Jiangxi Education Fund of China (KJLD13006); Jiangxi Scientific Fund of China (20142BBE50071).

摘要

摘要: 研究了相同氟碳比的氟化石墨（F-graphtie）和氟化多壁碳纳米管（F-MWCNTs）的电化学性能。高纯石墨化多壁碳纳米管经氟化处理后，获得一种核壳结构的F-WMCNTs （氟碳原子比C/F=1∶1）。经TEM、XRD、XPS表征表明，F-WMCNTs外层被氟化，形成氟化碳结构，而内层依然保持原有的石墨结构。以此F-WMCNTs作正极活性材料组装成锂氟（Li/CF_x）一次电池。经电化学测试表明，在相同的放电倍率下，对比F-graphite电极（C/F=1∶1），F-WMCNTs电极能够有效提高Li/CF_x一次电池的放电容量和电压平台。大倍率（≥1 C）放电时，尤其明显。当放电倍率为0.05 C时，F-WMCNTs极和F-graphite电极比容量分别为822 mAh/g和786.1 mAh/g，F-WMCNTs电极放电容量比F-graphite电极提高4.5%。当放电倍率为2 C时，F-WMCNTs电极和F-graphite电极分别达到375.4 mAh/g和283.7 mAh/g，F-WMCNTs电极的放电比容量比F-graphite电极提高了32.2%。F-WMCNTs电极显示出优异的倍率性能。
- 多壁碳纳米管 /
- 石墨化 /
- 氟化多壁碳纳米管 /
- 锂氟一次电池
Abstract: Fluorinated graphite (F-graphite) and multiwall carbon nanotubes (F-MWCNTs) were synthesized by direct fluorination with fluorine gas and used as the cathode materials of lithium primary batteries. Their microstructures were characterized by SEM, TEM, XRD and XPS. Results show that the F-MWCNTs have a core-shell structure with the outer layers fluorinated while the inner ones retain their pristine graphitized structure. A F-MWCNT electrode exhibited a higher discharge capacity and a higher discharge plateau than a F-graphite electrode at the same C rates. The discharge capacities of the F-MWCNT and F-graphite electrodes reached 822 and 786.1 mAh/g at 0.05 C, respectively. The corresponding values reached 375.4 and 283.7 mAh/g at 2 C, indicating an excellent rate performance for the former.
- Multiwall carbon nanotubes /
- Graphitization /
- Fluorinated multiwalled carbon nanotubes /
- Lithium/carbon fluorinated primary batteries

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