WO3/rGO纳米复合材料的制备及其储锂性能研究

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李芬芬，  郭金学*

(青岛科技大学 化学与分子工程学院，山东 青岛266042)

摘要： 采用水热法合成了WO3/rGO纳米复合材料，并将其用作锂离子电池负极材料。水热处理过程中将氧化石墨烯（GO）还原转变成了还原型氧化石墨烯（rGO），氧化石墨烯经还原后会产生不饱和的、共轭的碳原子，表面缺陷增加从而活性位点增加，使电导率显著增加。结果显示：所制备的WO3/rGO纳米复合材料中,WO3均匀地负载到了rGO纳米片上。电化学测试表明：所获得的WO3/rGO纳米复合材料首次放电比容量达到1 1357 mA·h·g-1;200圈以后依然能够保持较高的放电比容量(780 mA·h·g-1)。

关键词： 锂离子电池； 负极材料；WO3； 还原氧化石墨烯

中图分类号：TM 912；O 611.62；O 613.71文献标志码：A

 Synthesis of WO3/rGO Nanocomposites and Its Lithium Storage Performance

LI Fenfen, GUO Jinxue

(College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: WO3/rGO nanocomposite has been synthesized via a simple hydrothermal approach as anode materials for lithium ion batteries (LIBs). The GO has been reduced into rGO during the hydrothermal process. After the hydrothermal treatment, the rGO possesses more unsaturated, conjugated carbon atoms and surface defects, which will increase the number of catalytic active sites and the electrical conductivity. TEM images showed that WO3 nanoparticles were well dispersed onto the surface of rGO nanosheets. Electrochemical tests revealed that, the high initial capacity of 1 1357 mA·h·g-1 was observed, which could be maintained as high as 780 mA·h·g-1 after 200 cycles.

Key words:  lithium ion batteries; anode material; WO3; reduced graphene oxide

 收稿日期：20150101

基金项目： 山东省优秀中青年科学家科研奖励基金项目（BS2011CL020）.

作者简介： 李芬芬(1989—)，女，硕士研究生.*通信联系人.

文章编号：16726987（2016）04042306； DOI： 10.16351/j.16726987.2016.04.014