LiFeSO4F/石墨烯复合材料的制备与电化学性能

doi:10.61558/2993-074X.2891

电化学（中英文） ›› 2012, Vol. 18 ›› Issue (2): 125-130. doi: 10.61558/2993-074X.2891

• 化学电源近期研究专辑（武汉大学杨汉西教授主编） • 上一篇下一篇

LiFeSO4F/石墨烯复合材料的制备与电化学性能

郭维, 殷雅侠, 万立骏, 郭玉国*

中国科学院化学研究所，分子纳米结构与纳米技术院重点实验室，北京 100190

收稿日期:2011-11-24 修回日期:2011-12-29 出版日期:2012-04-28 发布日期:2012-01-15
通讯作者: 郭玉国 E-mail:ygguo@iccas.ac.cn
基金资助:
国家自然科学基金项目(No. 91127044，No. 20821003)；国家重大科学研究计划项目(No. 2011CB935700，No. 2009CB930400)资助

Synthesis and Electrochemical Properties of LiFeSO4F/graphene Composite as Cathode Material for Lithium-ion Batteries

GUO Wei, YIN Ya-Xia, WAN Li-Jun, GUO Yu-Guo*

CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, China

Received:2011-11-24 Revised:2011-12-29 Published:2012-04-28 Online:2012-01-15
Contact: GUO Yu-Guo E-mail:ygguo@iccas.ac.cn

摘要/Abstract

摘要： 分别以FeSO4?H2O、FeSO4?4H2O和FeSO4?7H2O为原料与LiF在四甘醇介质中反应制得LiFeSO4F，用X射线衍射（XRD）、扫描电镜（SEM）和透射电镜（TEM）表征LiFeSO4F的结构和形貌．热重分析表明LiFeSO4F在400 °C开始分解．XRD结果表明，以FeSO4?4H2O和FeSO4?7H2O为原料，多个结晶水的存在可以延缓原料的脱水过程，有利于消除产物中FeSO4杂相的生成．利用循环伏安（CV）、电化学交流阻抗（EIS）和充放电实验测试了材料的电化学性能，发现加入石墨烯后可以促进LiFeSO4F的电化学活性，提高材料的比容量、倍率性能和循环性能．

关键词: 锂离子电池, LiFeSO4F, 石墨烯, 电化学性能, 正极材料

Abstract: The LiFeSO4F was successfully synthesized from the reactions of FeSO4?xH2O (x=1, 4, 7) with LiF in tetraethylene glycol media through a facile low temperature method. The structures and microscopic features of the products were characterized by XRD, SEM and TEM. TGA result shows the good thermal stability of the as-prepared LiFeSO4F. No diffraction peaks of the FeSO4 are observed in the as-prepared products with the starting material of either FeSO4?4H2O or FeSO4?7H2O, which should be ascribed to delaying the release of H2O from the hydrated compounds. Cyclic voltammetry (CV) curves and electrochemical impedance spectroscopy (EIS) results prove that the LiFeSO4F/graphene composite exhibit less electrochemical polarization and smaller impedance than those of pure LiFeSO4F, in which the graphene serves as the electronic conductivity support to enhance the lithium storage properties. The LiFeSO4F/graphene composite shows a high specific capacity, good rate capability and cycling stability compared with the pure LiFeSO4F.

Key words: Lithium-ion batteries, LiFeSO4F, graphene, electrochemical performances, cathode

中图分类号:

TM911

郭维, 殷雅侠, 万立骏, 郭玉国. LiFeSO4F/石墨烯复合材料的制备与电化学性能[J]. 电化学（中英文）, 2012, 18(2): 125-130.

GUO Wei, YIN Ya-Xia, WAN Li-Jun, GUO Yu-Guo. Synthesis and Electrochemical Properties of LiFeSO4F/graphene Composite as Cathode Material for Lithium-ion Batteries[J]. Journal of Electrochemistry, 2012, 18(2): 125-130.

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https://electrochem.xmu.edu.cn/CN/Y2012/V18/I2/125

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LiFeSO4F/石墨烯复合材料的制备与电化学性能

Synthesis and Electrochemical Properties of LiFeSO4F/graphene Composite as Cathode Material for Lithium-ion Batteries

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