基于共价键作用的四氧化三铁-还原氧化石墨烯复合材料的合成及其储锂性能  

Ferric Oxide-reduced Graphene Oxide Composite Material: Synthesis Based on Covalent Binding and Its Lithium-storage Property

作　　者：秦士林 李继成 李朝晖[1] 胡忠良[2] 丁燕怀[3] 雷钢铁[1] 肖启振[1] QIN Shi-Lin;LI Ji-Cheng;LI Zhao-Hui;HU Zhong-Liang;DING Yan-Huai;LEI Gang-Tie;XIAO Qi-Zhen(College of Chemistry,Xiangtan University,Xiangtan 411105,China;College of Metallurgic Engineering,Hunan Univer-sity of Technology,Zhuzhou 412007,China;College of Civil Engineering ＆ Mechanics,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湘潭大学化学学院,湘潭411105 [2]湖南工业大学冶金工程学院,株洲412007 [3]湘潭大学土木工程与力学学院,湘潭411105

出　　处：《无机材料学报》2018年第7期741-748,共8页Journal of Inorganic Materials

基　　金：国家自然科学基金(21376069;21576075);湖南省教育厅科技项目(17A205)~~

摘　　要：采用溶剂热法制备单分散的Fe_3O_4微球,对其表面进行包覆SiO_2和氨基化处理,再与氧化石墨烯复合,化学还原后得到Fe_3O_4-W-RGO复合材料。SEM和TEM照片显示,SiO_2均匀包覆在Fe_3O_4微球(直径~440 nm)表面形成Fe_3O_4@SiO_2核壳微球,紧密束缚于RGO纳米片表面。XRD测试结果表明Fe_3O_4微球结晶度好、纯度高。电化学性能测试结果表明:在0.01~3.00 V电压范围和0.1C倍率下,Fe_3O_4-W-RGO复合材料的首次放电容量为1246 m Ah/g,100次循环后保持830 m Ah/g;在2C倍率下放电容量达到484 m Ah/g,具有较好的倍率性能和循环性能。Monodispersed ferroferric oxide（Fe3O4） microspheres were prepared by a solvo-thermal method at first. They were coated with a thin layer of silica, and modified with amino groups. These updated microspheres were mixed with graphene oxide（GO） followed by a chemical reduction to yield Fe3O4-W-RGO. The sample was characterized with scanning electron microscopy（SEM） and transition electron microscopy（TEM）. Fe3O4 microspheres（-440 nm in diameter） are proved to be surface-coated by a SiO2 layer homogeneously to afford Fe3O4@SiO2 core-shell microspheres, tightly bound to reduced graphene oxide（RGO） nanosheets. From X-ray diffraction（XRD） patterns, Fe3O4 microspheres display good crystallinity and high purity. Results of electrochemical measurements indicate that Fe3O4-W-RGO sample can deliver an initial capacity of 1246 m Ah/g at 0.1 C rate over 0.01 V-3.00 V（vs. Li＋/Li）, and retain 830 m Ah/g after 100 cycles. Even at 2 C rate, it can still deliver a capacity of 484 m Ah/g. All results suggest that Fe3O4-W-RGO composite material possesses good rate capability and cycling performance when used as anode material for lithium-ion batteries.

关 键 词：四氧化三铁 氧化石墨烯 共价键作用 锂离子电池 

分 类 号：TQ174[化学工程—陶瓷工业]