铁系尖晶石氧化物-石墨烯复合材料的制备及其电化学性能
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- 英文论文题名：Synthesis and electrochemical properties of spinel Ni_xCo_(1-x)Fe_2O_4-graphene nanocomposites
- 论文作者：蔡莉 ; 夏锡锋 ; 刘鹏 ; 郝青丽
- 英文论文作者：Li Cai ; Xifeng Xia ; Peng Liu ; Qingli Hao ; School of Chemical Engineering ; Nanjing University of Science and Technology
- 年：2016
- 作者机构：南京理工大学化工学院;
- 论文关键词：石墨烯 ; 铁系尖晶石 ; 锂离子电池
- 英文论文关键词：graphene ; spinel ferrite ; Lithium ion batteries
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：中文
- 分类号：TB332
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：182k
- 原文格式：D
- 会议级别：全国
摘要
采用水热合成的方法制备了铁系尖晶石结构的纳米材料。通过透射电镜,X射线衍射测试了样品的形貌结构和物相构成,采用循环伏安法、恒流充放电和交流阻抗等技术分别研究了该纳米材料的相关电化学性能。结果表明尖晶石结构的Ni_xCo_(1-x)Fe_2O_4/rGO纳米材料具有较好的形貌,并均匀分散在片层石墨烯载体上。通过测试其锂离子电池性能发现,该复合材料的锂电性能较为优异,在0.1A/g的电流密度下首次放电的比容量高达1296mAh/g,在经过50圈循环测试后比容量的保持率为77%。展现出良好的循环稳定性。材料中Ni_xCo_(1-x)Fe_2O_4微粒的纳米化减小了在充放电过程中材料体积变化带来的影响。同时石墨烯的加入既减小了材料的电阻,增加了材料的比表面积和与电解液的接触面积,从而提高了铁酸钴镍/石墨烯复合材料的电化学性能。
The nanosized spinel material was synthesized by a hydrothermal method.The microstructure and phase formation during the processing were characterized by transmission electron microscopy,X-ray diffraction.The detailed electrochemical performances of the Ni_xCo_(1-x)Fe_2O_4/rGO nanostructures were investigated by cyclic voltammetry and galvanostatic charge-discharge measurements.The results indicate that the Ni_xCo_(1-x)Fe_2O_4 were well dispersed over the rGO layers,and the Ni_xCo_(1-x)Fe_2O_4/rGO displays the maximum capacity of 1296 mAhg~(-1)with the capacity retention rate of 77% after 50 cycles at 0.1 A/g,showing the good stability cycle performance.In addition,the nano size of Ni_xCo_(1-x)Fe_2O_4 particle reduces the volume change in the charge and discharge process.Graphene can reduce the resistance and increase specific surface area and the attach of material and electrolyte,which increase the electrical performance of Ni_xCo_(1-x)Fe_2O_4/rGO.
The nanosized spinel material was synthesized by a hydrothermal method.The microstructure and phase formation during the processing were characterized by transmission electron microscopy,X-ray diffraction.The detailed electrochemical performances of the Ni_xCo_(1-x)Fe_2O_4/rGO nanostructures were investigated by cyclic voltammetry and galvanostatic charge-discharge measurements.The results indicate that the Ni_xCo_(1-x)Fe_2O_4 were well dispersed over the rGO layers,and the Ni_xCo_(1-x)Fe_2O_4/rGO displays the maximum capacity of 1296 mAhg~(-1)with the capacity retention rate of 77% after 50 cycles at 0.1 A/g,showing the good stability cycle performance.In addition,the nano size of Ni_xCo_(1-x)Fe_2O_4 particle reduces the volume change in the charge and discharge process.Graphene can reduce the resistance and increase specific surface area and the attach of material and electrolyte,which increase the electrical performance of Ni_xCo_(1-x)Fe_2O_4/rGO.
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