高性能氮掺杂石墨烯的制备及其储锂性能

doi:10.19799/j.cnki.2095-4239.2019.0172

储能科学与技术 ›› 2019, Vol. 8 ›› Issue (6): 1137-1144.doi: 10.19799/j.cnki.2095-4239.2019.0172

高性能氮掺杂石墨烯的制备及其储锂性能

沈进冉¹, 郭翠静¹, 陈赫², 周淑琴¹, 徐斌², 官亦标³

1 中国电力科学研究院有限公司, 北京 100192;
2 北京化工大学材料科学与工程学院, 北京 100029;
3 中国电力科学研究院有限公司新能源与储能运行控制国家重点实验室, 北京 100192

收稿日期:2019-07-26 修回日期:2019-08-12 出版日期:2019-11-01 发布日期:2019-08-23
通讯作者: 官亦标,高工,研究方向为储能电池技术与评价研究,E-mail:guanyb@epri.sgcc.com.cn。
作者简介:沈进冉(1989-),女,硕士,主要从事储能电池检测与评价,E-mail:shenjinran@epri.sgcc.com.cn
基金资助:
国家电网公司科技项目“石墨烯在储能用电容型锂离子电池中的应用探索研究”（DG71-16-024）。

Synthesis and lithium storage property of high-performance N-doped reduced graphene oxide

SHEN Jinran¹, GUO Cuijing¹, CHEN He², ZHOU Shuqin¹, XU Bin², GUAN Yibiao³

1 China Electric Power Research Institute, Beijing 100192, China;
2 College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
3 State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems, China Electric Power Research Institute, Beijing 100192, China

Received:2019-07-26 Revised:2019-08-12 Online:2019-11-01 Published:2019-08-23

摘要/Abstract

摘要： 石墨烯是一种具有高比表面积、高导电性和良好化学稳定性的新型二维碳材料，在电化学储能领域具有广阔的应用前景。氮原子掺杂可以制造结构缺陷并改变电荷分布，有利于增强其电化学储能性能。本工作以尿素为氮源，与氧化石墨烯混合冻干，经过高温热还原制备出氮掺杂石墨烯材料，研究了热还原温度对其化学组成、形貌结构以及电化学储锂性能的影响。研究结果表明，随着热还原温度的升高，材料的氮含量下降，石墨化程度升高，电导率提高。将其作为负极材料组装成锂离子半电池进行测试，样品N-rGO-800在0.05 A/g的电流密度下表现出高达876 mA·h/g的稳定比容量，优于目前文献报道的比容量。在1 A/g的大电流密度下，其依然具有584 mA·h/g的比容量，经过850圈的长循环，容量保持稳定，显示出该材料优异的循环和倍率性能。

关键词: 氮掺杂, 还原氧化石墨烯, 负极材料, 锂离子电池

Abstract: Graphene is a two-dimensional carbon material with high conductivity, good chemical stability and excellent electrochemical performance, which has promising prospects in energy storage field. Nitrogen doping can not only create structural defects, but also change the electronic distribution for graphene, which is beneficial for the electrochemical energy storage properties. In our work, the nitrogendoped graphene (N-rGO) was prepared using low cost nitrogen source (urea) and graphene oxide solution by freeze-drying and the subsequent high-temperature thermal reduction. The effects of thermal reduction temperature on the chemical composition, structure and electrochemical properties of the N-rGO were also studied. The results show that with the increase of thermal reduction temperature, the nitrogen content decreases, while the graphitization degree and the conductivity increases (72.3 S·cm^-1), indicating the improved lithium storage performance. Tested in half-cell as anode material, the N-rGO-800 exhibits a high reversible capacity of 876 mA·h·g^-1 at 0.05 A·g^-1, superior to the values reported previously. Meanwhile, the specific capacity can retain 584 mA·h·g^-1 at 1 A·g^-1 and remains stable after 850 cycles, indicating excellent cyclic stability and good rate performance.

Key words: nitrogen doped, reduced graphene oxide, anode materials, lithium ion battery

中图分类号:

TM911

沈进冉, 郭翠静, 陈赫, 周淑琴, 徐斌, 官亦标. 高性能氮掺杂石墨烯的制备及其储锂性能[J]. 储能科学与技术, 2019, 8(6): 1137-1144.

SHEN Jinran, GUO Cuijing, CHEN He, ZHOU Shuqin, XU Bin, GUAN Yibiao. Synthesis and lithium storage property of high-performance N-doped reduced graphene oxide[J]. Energy Storage Science and Technology, 2019, 8(6): 1137-1144.

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高性能氮掺杂石墨烯的制备及其储锂性能

Synthesis and lithium storage property of high-performance N-doped reduced graphene oxide

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