Promotive effect of multi-walled carbon nanotubes on Co3O4 nanosheets and their application in lithium-ion battery
Promotive effect of multi-walled carbon nanotubes on Co3O4 nanosheets and their application in lithium-ion battery
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多壁碳纳米管对Co3O4纳米片的促进作用及其在锂离子电池中的应用
DOI：
10.1016/j.pnsc.2014.05.001
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发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
Ying Wu
中科院分区：
文献类型：
--
作者：
Xiaogang Zhang;Chengkang Chang;Dongyun Zhang;Ying Wu
以表面活性剂(CTAB)和沉淀剂(尿素)为原料，采用简单的水热法制备了Co3O4/MWCNTs复合材料。用X射线衍射仪、扫描电子显微镜和比表面积法对样品进行了表征。通过交流阻抗谱和恒电流测试，研究了样品作为锂电池负极材料的电化学性能。与Co3O4纳米片相比，Co3O4/MWCNTs复合材料具有更高的容量和更好的循环性能。混杂复合材料中电化学性能的显著改善可能与MWCNTs的加入有关，它具有良好的导电性和较大的比表面积，有助于缓解体积变化的影响，缩短锂离子的扩散距离，促进电子的传递，保持结构的稳定。
Co3O4/MWCNTs composites have been synthesized by a simple hydrothermal method using a surfactant (CTAB) and a precipitation agent (urea). The samples were characterized by XRD, SEM and BET methods. The electrochemical properties of the samples as anode materials for lithium batteries were studied by EIS and Galvanostatic measurements. The Co3O4/MWCNTs composites displayed higher capacity and better cycle performance in comparison with the Co3O4nanosheets. The remarkable improvement of electrochemical performance within the hybrid composites is probably related to the addition of MWCNTs that possesses improved properties such as excellent electric conductivity and large surface area, which helps to alleviate the effect of volume change, shorten the distance of lithium ion diffusion, facilitate the transmission of electron and keep the structure stable.
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