锂硫电池石墨烯/纳米硫复合正极材料的制备及电化学性能

doi:10.11949/j.issn.0438-1157.20160584

化工学报 ›› 2016, Vol. 67 ›› Issue (10): 4363-4369.DOI: 10.11949/j.issn.0438-1157.20160584

锂硫电池石墨烯/纳米硫复合正极材料的制备及电化学性能

杨蓉¹, 王黎晴¹, 吕梦妮¹, 邓坤发¹, 燕映霖², 任冰², 李兰¹

1 西安理工大学理学院, 陕西西安 710048;
2 西安理工大学材料科学与工程学院, 陕西西安 710048

收稿日期:2016-05-03 修回日期:2016-06-21 出版日期:2016-10-05 发布日期:2016-10-05
通讯作者: 杨蓉
基金资助:
国家国际科技合作专项资助项目（2015DFR50350）；陕西省教育厅自然科学专项（15JK1538）。

Preparation and electrochemical properties of graphene/nano-sulfur composite as cathode materials for lithium-sulfur batteries

YANG Rong¹, WANG Liqing¹, LÜ Mengni¹, DENG Kunfa¹, YAN Yinglin², REN Bing², LI Lan¹

1 School of Science, Xi'an University of Technology, Xi'an 710048, Shaanxi, China;
2 School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China

Received:2016-05-03 Revised:2016-06-21 Online:2016-10-05 Published:2016-10-05
Supported by:
supported by the International Science Technology Cooperation Program of China (2015DFR50350) and the Scientific Research Program Funded by Shaanxi Provincial Education Department (15JK1538).

摘要/Abstract

摘要：

利用热解还原将Hummers法制得的氧化石墨烯还原为石墨烯，并采用化学沉淀法将纳米硫成功负载到石墨烯片层上，获得石墨烯/纳米硫（RGO/nano-S）正极复合材料。利用FT-IR、XRD、SEM、TEM和Raman对所制备复合材料的微观结构、形貌等进行表征，采用恒流充放电、循环伏安法和交流阻抗法对复合材料的电化学性能进行研究。研究结果表明，热还原所得石墨烯褶皱的表面形成容纳硫及多硫离子的空间，有助于缓解活性物质溶解和抑制多硫离子迁移；同时，均匀分布的纳米硫能更好地与电解液接触，在石墨烯的导电网络上增大了电化学反应面积，进而改善了该材料作为锂硫电池的实际放比电容量和倍率循环性能。

关键词: 锂硫电池, 石墨烯, 纳米硫, 复合材料, 电化学性能

Abstract:

A graphene/nano-sulfur (RGO/nano-S) cathode composites was prepared by chemical precipitation of nano-sulfur onto graphene sheets, which were synthesized by pyrolyzing reduction of graphene oxide from Hummers method. The microscopic structure and morphology of the composites were characterized by FT-IR, XRD, SEM, TEM and Raman, while the electrochemical properties were studied by galvanostatic charge-discharge measurements, cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that wrinkled surface on the thermally reduced graphene created a space to accommodate sulfur and polysulfur ions, which helped to hinder dissolving of active cathode materials and suppress migration of polysulfide ions. A homogeneous distribution of nano-sulfur in the graphene conductive network significantly enhanced the effective contact with electrolyte and increased electrochemical reaction area, so that improved discharge capacity and cycle-life performance of the lithium-sulfur batteries.

Key words: lithium-sulfur batteries, graphene, nano-sulfur, composites, electrochemical performance

中图分类号:

O46
TB34

杨蓉, 王黎晴, 吕梦妮, 邓坤发, 燕映霖, 任冰, 李兰. 锂硫电池石墨烯/纳米硫复合正极材料的制备及电化学性能[J]. 化工学报, 2016, 67(10): 4363-4369.

YANG Rong, WANG Liqing, LÜ Mengni, DENG Kunfa, YAN Yinglin, REN Bing, LI Lan. Preparation and electrochemical properties of graphene/nano-sulfur composite as cathode materials for lithium-sulfur batteries[J]. CIESC Journal, 2016, 67(10): 4363-4369.

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锂硫电池石墨烯/纳米硫复合正极材料的制备及电化学性能

Preparation and electrochemical properties of graphene/nano-sulfur composite as cathode materials for lithium-sulfur batteries

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