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Co–MOFs纳米片/碳布复合材料的制备及在锂离子电池中的应用
作者:曹娜 杜慧玲 王金磊 马武祥 马万里 田超 
单位:西安科技大学材料科学与工程学院 西安 710054 
关键词:钴基金属有机骨架 碳布 负极材料 锂离子电池 黏结剂 
分类号:TM911
出版年,卷(期):页码:2018,46(12):0-0
DOI:10.14062/j.issn.0454-5648.2018.12.14
摘要:

 采用液相沉积法在导电碳布表面原位生长Co–MOFs纳米片,制得了Co–MOFs/CF复合材料。通过红外光谱、X射线衍射、扫描电子显微镜、恒流充放电、循环伏安、电化学阻抗等手段对材料的组成、结构形貌和电化学性能进行了表征。结果表明:当用作无黏结剂型锂离子电池电极时,在50 mA/g电流密度下,Co–MOFs/CF的首次放电比容量为1 621.3 mA•h/g,100次循环后,其放电比容量仍可达445.1 mA•h/g。相比于纯Co–MOFs,Co–MOFs/CF的首次Coulomb效率和循环性能均有明显改善,主要归因于Co–MOFs的二维片状结构与碳布良好导电性之间的协同作用,Co–MOFs/CF优异的电化学性能使其成为很好的锂离子电池电极候选材料。

 Co–MOFs nanosheets were in situ grown on the surface of the pretreated carbon cloth (Co–MOFs/CF) by a facile liquid–phase deposition method. The compositions, structures, morphologies and electrochemical properties of the composite were investigated and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, galvanostatic charge–discharge test, cyclic voltammetry and electrochemical impedance spectroscopy, respectively. As binder-free anodes for lithium ion batteries, the Co–MOFs/CF composite shows a higher initial coulombic efficiency and a better cycling performance, compared with pure Co–MOFs. At a current density of 50 mA/g, Co–MOFs/CF has an initial discharge capacity of   1621.3 mA•h/g, and becomes 445.1 mA•h/g after 100 charge/discharge cycles. The improved electrochemical performance could be attributed to the synergetic effect betheen the conductive carbon cloth and the two-dimensional nanosheets of Co–MOFs. Co–MOFs/CF could be used as a promising candidate for anode material of lithium ion batteries due to its superior electrochemical performance.

基金项目:
国家自然科学基金(51372197);陕西省重点科技创新团队 (2014KCT–04);陕西省国际科技合作重点项目(2012KW–10) 资助。
作者简介:
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