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材料工程  2018, Vol. 46 Issue (2): 9-15    DOI: 10.11868/j.issn.1001-4381.2017.000752
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
高温还原GO制备LiFePO4/石墨烯复合正极材料及表征
邓凌峰, 覃昱焜, 彭辉艳, 连晓辉, 吴义强
中南林业科技大学 材料科学与工程学院, 长沙 410004
Preparation and Characterization of LiFePO4/Graphene Composite Cathode Materials by High Temperature Reduction GO
DENG Ling-feng, QIN Yu-kun, PENG Hui-yan, LIAN Xiao-hui, WU Yi-qiang
School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
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摘要 通过对氧化石墨烯(GO)进行微观调控处理得到少层GO。采用喷雾干燥再高温改性的方法制备LiFePO4/石墨烯锂离子电池复合正极材料;GO还原后即可得到石墨烯,其优良的导电性可以提高LiFePO4的电子传输能力。通过X射线衍射(XRD)、红外光谱(FTIR)、扫描电镜(SEM)、透射电镜(TEM)和电化学测试技术等方法对复合材料的结构、形貌及电化学性能进行表征。石墨烯的复合使材料颗粒间构建空间三维导电网络,提高了电解质/电极材料界面的电荷转移速率,改善了LiFePO4的电化学性能。电化学测试结果表明,在0.1C时LiFePO4的放电比容量为155mAh/g,LiFePO4/石墨烯复合材料的放电比容量为164mAh/g;1C和2C倍率时,LiFePO4/石墨烯复合材料的放电比容量分别为140,119mAh/g。
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邓凌峰
覃昱焜
彭辉艳
连晓辉
吴义强
关键词 氧化石墨烯石墨烯喷雾干燥导电网络电化学性能    
Abstract:Micro layer of GO was obtained by micro adjustment and control. LiFePO4/graphene composite cathode materials were synthesized using a spray drying followed by high temperature reduction modification method, to improve conductivity of LiFePO4 with excellent conductivity of graphene. The structure, morphology and electrochemical performance of the composite materials were characterized by XRD, FTIR, SEM, TEM and electrochemical measurement technologies. The three-dimensional conductive network was constructed by graphene composite in material particles, which can improve the charge transfer rate of the interface of electrolyte/electrode materials and the electrochemical performance of LiFePO4. The results show that the discharge specific capacity of LiFePO4 without graphene is only 155mAh/g, while the discharge specific capacity of LiFePO4/graphene is 164mAh/g at 0.1C.The discharge specific capacity of LiFePO4/graphene is 140,119mAh/g at 1,2C,respectively.
Key wordsgraphene oxide(GO)    graphene    spray drying    conductive network    electrochemical performance
收稿日期: 2017-06-13      出版日期: 2018-02-01
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材料学院(410004),denglingfeng168@126.com     E-mail: denglingfeng168@126.com
引用本文:   
邓凌峰, 覃昱焜, 彭辉艳, 连晓辉, 吴义强. 高温还原GO制备LiFePO4/石墨烯复合正极材料及表征[J]. 材料工程, 2018, 46(2): 9-15.
DENG Ling-feng, QIN Yu-kun, PENG Hui-yan, LIAN Xiao-hui, WU Yi-qiang. Preparation and Characterization of LiFePO4/Graphene Composite Cathode Materials by High Temperature Reduction GO. Journal of Materials Engineering, 2018, 46(2): 9-15.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2017.000752      或      http://jme.biam.ac.cn/CN/Y2018/V46/I2/9
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