Performance and morphology of centrifugally spun Co3O4/C composite fibers for anode materials in lithium-ion batteries
Performance and morphology of centrifugally spun Co3O4/C composite fibers for anode materials in lithium-ion batteries
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DOI：
10.1007/s10853-021-06285-3
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发表时间：
2021-07-09
影响因子：
4.5
通讯作者：
Alcoutlabi, Mataz
中科院分区：
文献类型：
--
作者：
Ayala, Jonathan;Ramirez, Daniel;Alcoutlabi, Mataz
制备了表面包覆纳米Co3O4的聚丙烯腈(PAN)超细纤维，制备了锂离子电池负极涂层Co3O4碳纤维(CCF)复合材料。将表面涂覆的Co3O4/PAN纤维在200℃下稳定4小时，然后在600℃下炭化6小时，得到了Co3O4/C复合纤维阳极。通过恒电流充放电、倍率、循环伏安、交流阻抗谱等测试手段，对不同活性物质含量的Co3O4/C复合纤维阳极的电化学性能进行了评价。CCF负极在100 mAg(-1)和200 mAg(-1)条件下分别循环100次，充电比容量分别为632和420mAHg(-1)，表现出良好的倍率性能。与碳纤维(CF)阳极(300mAHg(-1))相比，CCF的电化学性能有所提高，这归因于CFS与纳米Co3O4之间的相互作用。本文提出的合成方法可以为制备表面涂层纤维材料提供一条有效的途径，包括锂离子电池的独立负极材料，与碳纤维电极相比，具有更高的比容量和更好的电化学性能。
Centrifugally spun polyacrylonitrile (PAN) microfibers surface-coated with Co3O4 nanoparticles were prepared as precursors to produce coated Co3O4 carbon-fiber (CCF) composites for lithium-ion battery anodes. The Co3O4/C composite-fiber anodes were obtained after the stabilization of surface-coated Co3O4/PAN fibers at 200 degrees C for four hours, and subsequent carbonization at 600 degrees C for 6 hours. The electrochemical performance of the Co3O4/C composite-fiber anode with different active material loading was evaluated by using galvanostatic charge/discharge, rate performance, cyclic voltammetry, and electrochemical impedance spectroscopy experiments. The CCF anode delivered a specific charge capacity of 632 and 420 mAh g(-1) after 100 cycles at 100 and 200 mA g(-1), respectively, and exhibited good rate capability. An improved electrochemical performance of the CCF was observed compared to the carbon-fiber (CF) anode (300 mAh g(-1)), which was attributed to the interaction between CFs and Co3O4 nanoparticles. The synthesis method presented in this work can provide an effective avenue for the fabrication of surface coated-fiber materials, including free-standing anode materials for lithium-ion batteries with increased specific capacity and improved electrochemical performance compared to carbon-fiber electrodes.