石墨烯负载团簇结构CoFe2O4及其电化学储锂性

doi:10.15541/jim20160624

无机材料学报 ›› 2017, Vol. 32 ›› Issue (9): 904-908.DOI: 10.15541/jim20160624

石墨烯负载团簇结构CoFe₂O₄及其电化学储锂性

刘双宇, 徐丽, 陈新, 韩钰, 刘海镇, 盛鹏, 王博, 赵广耀

(全球能源互联网研究院, 先进输电技术国家重点实验室, 电工新材料技术联合实验室, 北京 102211)

收稿日期:2016-11-15 修回日期:2016-12-22 出版日期:2017-09-30 网络出版日期:2017-08-29
作者简介:刘双宇(1986–), 男, 博士. E-mail: liu123@zju.edu.cn
基金资助:
国网公司科技项目(SGRI-WD-71-14-017)

Graphene Loaded with Cluster Structural CoFe₂O₄ Particles and Its Li-Storage Performanc

LIU Shuang-Yu, XU Li, CHEN Xin, HAN Yu, LIU Hai-Zhen, SHENG Peng, WANG Bo, ZHAO Guang-Yao

(Materials Laboratory of State Grid Corporation of China, State Key Laboratory of Advanced Transmission Technology, Global Energy Interconnection Research Institute, Beijing 102211, China)

Received:2016-11-15 Revised:2016-12-22 Published:2017-09-30 Online:2017-08-29
About author:LIU Shuang-Yu. E-mail: liu123@zju.edu.cn

摘要/Abstract

摘要：

以氧化石墨为碳前驱体, 利用含氧官能团与金属离子的价键结合, 一步水热工艺同时实现石墨烯的制备及均匀负载团簇结构CoFe₂O₄。微观形貌显示CoFe₂O₄为一次颗粒组成的团簇结构。复合材料独特的结构有助于充分发挥石墨烯高导电性、大比表面积的优势, 相比单纯的CoFe₂O₄, 该复合材料具有优异的倍率特性和循环稳定性。石墨烯的高导电性提升了复合材料的整体导电和导锂特性。同时, 独特的团簇结构及石墨烯的限制作用抑制了活性纳米颗粒在充放电过程中的体积变化, 提高了活性材料的稳定性。

关键词: 石墨烯, 团簇结构, 电化学性能, 倍率性能, 循环稳定性

Abstract:

Oxidized graphite was used as carbon precursor, the preparations of graphene and cluster structural CoFe₂O₄ particles which homogeneously loaded on the grasphene were realized on the same time by one-step hydrothermal process combined with the bonding of oxygen-containing functional groups and metal ions. The microstructure observation shows that CoFe₂O₄ particles are composed of many primary particles. The unique structure of the composites helps graphene to develop its advantages of high conductivity and large specific surface area. Compared with pure CoFe₂O₄, the composites have excellent cycle stability and high rate performance. High-rate characteristics arise from high conductivity of graphene which enhances the overall conductivity and the diffusion of lithium in the composites. At the same time, the unique cluster structure and the confine of graphene inhibit the volume change of active nanoparticles in the charging and discharging process, and ensure the stability of active materials.

Key words: graphene, cluster structure, electrochemical performance, sandwich structrue

中图分类号:

TQ174

刘双宇, 徐丽, 陈新, 韩钰, 刘海镇, 盛鹏, 王博, 赵广耀. 石墨烯负载团簇结构CoFe₂O₄及其电化学储锂性[J]. 无机材料学报, 2017, 32(9): 904-908.

LIU Shuang-Yu, XU Li, CHEN Xin, HAN Yu, LIU Hai-Zhen, SHENG Peng, WANG Bo, ZHAO Guang-Yao. Graphene Loaded with Cluster Structural CoFe₂O₄ Particles and Its Li-Storage Performanc[J]. Journal of Inorganic Materials, 2017, 32(9): 904-908.

图/表 5

图1 团簇结构CoFe2O4与Graphene复合材料的生长流程

Fig. 1 Schematic illustration of the growth process of hollow structural CoFe2O4/GNs hybrid

图2 CoFe2O4/GNs复合材料的SEM和TEM照片

Fig. 2 SEM and TEM images of CoFe2O4/GNs composites (a) Low and (b) high magnification SEM images; (c) low and (d) high magnification TEM images

图3 CoFe2O4/GNs复合材料的XRD图谱

Fig. 3 XRD pattern of CoFe2O4/GNsc omposite

图4 GO、GNs和CoFe2O4/GNs复合材料的拉曼光谱和XPS C1s图谱

Fig. 4 Raman and XPS C1s spectra of GO, GNs and CoFe2O4/GNs composite (a) Raman and (b) XPS C1s spectra of GO, GNs and CoFe2O4/GNs

图5 CoFe2O4/GNs复合材料电化学性能

Fig. 5 Electrochemical performances of CoFe2O4/GNs composites (a) First three cycle of CoFe2O4/GNs composites; (b) Discharge/charge curves of CoFe2O4/GNs at different current density; (c) Rate performance of CoFe2O4/GNs compared with bare CoFe2O4; (d) Cycle stability of CoFe2O4/GNs at 400 and 800 mA/g

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石墨烯负载团簇结构CoFe₂O₄及其电化学储锂性

Graphene Loaded with Cluster Structural CoFe₂O₄ Particles and Its Li-Storage Performanc

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