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Characteristics of Electrochemical Insertion Lithium of Carbon Nanotubes
Chen Weixianga1, Wu Guotaob2, Wang Chunshengc3, Yang Hangshenga1, He Peimob2, Zhang Xiaobinc3, Xu Zhudea1, Li Wenzhub2, Yang Yong4
1.Department of Chemistry Zhejiang University, Hangzhou 310027;2.Department ofPhysics Zhejiang University, Hangzhou 310027;3.Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027;4.State Key Laboratory ofPhysical Chemistry of Solid Surface,Department of Chemistry, Xiamen University, Xiamen 361005
Abstract:
The microstructure of the carbon nanotubes were characterized by means of transmis-sion electron microscope, high-resolution transmission electron microscope, X-ray diffraction and Raman spectra. The effects of the microstructure on their properties of electrochemical insertion were investigated. The carbon nanotube, which preparaed by catalytic decomposition of acetylene using iron nanoparticles as catalyst, showed a low degree of graphitization. There were large amount of the defects such as wrinkled graphite sheets, interstitial carbon atoms, unorga-nized graphitic structure and microcavities in this nanotube and lead to a higher specific capacity, which is 640mAh/g at first cycle. But the defect structure resulted in a low cycling stability. After 40 cycles, its capacity was degraded to 58% of the original one. The carbon nanotube, which prepared by the pyrolysis of ethylene catalyzed by iron oxide nanoparticales, showed a high degree of graphitization and a rule microstructure. The well-graphitized carbon nanotube exhibited a low electrochemical storage lithium capacity, which is 282mAh/g at first cycle. But it showed a good cycling stability. After 40 cycles, the capacity maintained 86% of the original capacity. The influences of the temperature and charge/discharge current densities on their electrochemical storage lithium capacities were also discussed.
Key words:  Carbon nanotubes, Lithium ion rechargeable battery, Negative materials, Electrochemical storage lithium
FundProject:浙江省自然科学基金(No.200053)和厦门大学固体表面物理化学国家重点实验室开放基金资助项目
纳米碳管的电化学贮锂性能
陈卫祥1, 吴国涛2, 王春生3, 杨杭生1, 何丕膜2, 张孝彬3, 徐铸德1, 李文铸2, 杨勇4
1.浙江大学化学系,杭州 310027;2.浙江大学物理系,杭州 310027;3.浙江大学材料科学与工程系,杭州 310027;4.厦门大学化学系固体表面物理化学国家重点实验室,厦门 361005
摘要:
用透射电镜、高分辩透射电镜、X射线衍射和拉曼光谱表征了用催化热解法制备的纳米碳管的结构,研究了纳米碳管的电化学嵌脱锂性能.以纳米级铁粉为催化剂热解乙炔气得到的纳米碳管石墨化程度较低,结构中存在褶皱的石墨层、乱层石墨和微孔等缺陷,具有较高的贮锂容量,初始容量为640mAh/g,但循环稳定性较差.而以纳米级氧化铁粉为催化剂热解乙烯得到的纳米碳管结构比较规则,循环稳定性较好,但贮锂容量较低,初始容量为282mAh/g.讨论了纳米碳管的结构对其温度特性和不同电流密度下的充放电容量的影响.
关键词:  纳米碳管  锂离子电池  负极材料  电化学贮锂
DOI:10.1088/1674-0068/14/1/88-94
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