高温还原GO制备LiFePO<sub>4</sub>/石墨烯复合正极材料及表征

doi:10.11868/j.issn.1001-4381.2017.000752

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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 words： graphene 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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