碳纳米管与石墨烯协同改性天然石墨及其电化学性能

doi:10.11868/j.issn.1001-4381.2016.001044

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摘要以碳纳米管和氧化石墨烯为原料，二者按5 ∶ 3混合超声分散再高温还原制备碳纳米管/石墨烯/天然石墨（CNTs/rGO/NG）锂离子复合负极材料。采用扫描电镜（SEM）、X射线衍射（XRD）、红外光谱（FTIR）和电化学测试等分析技术对复合材料的形貌、结构、电化学进行表征。结果表明：石墨烯和碳纳米管在天然石墨表面形成三维立体网络结构。与纯天然石墨相比，CNTs/rGO/NG复合材料具有良好的倍率性能和循环寿命，在0.1C时首次放电比容量为479mAh/g，可逆容量达473mAh/g，循环100次后容量为439.5mAh/g，容量保持率为92%，在0.5， 1， 5C不同电流倍率时容量依次为457， 433， 394mAh/g。

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	邓凌峰
	彭辉艳
	覃昱焜
	吴义强

关键词 ：碳纳米管, 氧化石墨烯, 负极材料, 电化学性能, 三维网络结构

Abstract：The CNTs/rGO/NG composite lithiumion battery anode material was synthesized by thermal reducing, using graphene oxide (GO) and carbon nanotubes (CNTs) as precursors for a 5 ∶ 3 proportion. The morphology, structure, and electrochemical performance of the composite were characterized by scanning electron microscopy(SEM), X-ray diffractometry(XRD), Fourier transform infrared spectra (FTIR) and electrochemical measurements. The results show that reduced graphene oxide and carbon nanotubes form a perfect three-dimensional network structure on the surface of natural graphite. CNTs/rGO/NG composite has good rate performance and cycle life,compared with pure natural graphite.The initial discharge capacity of designed anode is 479mAh/g at 0.1C, the reversible capacity up to 473mAh/g after 100 cycles,the capacity is still 439.5mAh/g, the capacity retention rate is 92%,and the capacity is 457, 433, 394mAh/g at 0.5, 1, 5C, respectively.

Key words： carbon nanotubes graphene oxide anode material electrochemical performance 3D network structure

收稿日期: 2016-09-03 出版日期: 2017-04-17

中图分类号:

TM912

通讯作者: 邓凌峰(1970-),男,副教授,博士,主要从事能源材料的研究,联系地址:湖南省长沙市天心区韶山南路498号中南林业科技大学研究生院(410004),E-mail:denglingfeng168@126.com E-mail: denglingfeng168@126.com

引用本文:

邓凌峰, 彭辉艳, 覃昱焜, 吴义强. 碳纳米管与石墨烯协同改性天然石墨及其电化学性能[J]. 材料工程, 2017, 45(4): 121-127.
DENG Ling-feng, PENG Hui-yan, QIN Yu-kun, WU Yi-qiang. Combination Carbon Nanotubes with Graphene Modified Natural Graphite and Its Electrochemical Performance. Journal of Materials Engineering, 2017, 45(4): 121-127.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.001044 或 http://jme.biam.ac.cn/CN/Y2017/V45/I4/121

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