4.6 Article

Performance and morphology of centrifugally spun Co3O4/C composite fibers for anode materials in lithium-ion batteries

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JOURNAL OF MATERIALS SCIENCE
卷 56, 期 28, 页码 16010-16027

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SPRINGER
DOI: 10.1007/s10853-021-06285-3

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资金

  1. NSF PREM award [DMR-1523577]
  2. Robert A. Welch Foundation [BX-0048]
  3. NSF through the UMN MRSEC program [DMR-2011401]

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Centrifugally spun polyacrylonitrile (PAN) microfibers surface-coated with Co3O4 nanoparticles were used to produce coated Co3O4 carbon-fiber (CCF) composites for lithium-ion battery anodes. The resulting CCF anode exhibited improved electrochemical performance compared to carbon-fiber (CF) anodes, with higher specific charge capacity and good rate capability. This synthesis method provides an effective approach for fabricating surface coated-fiber materials with enhanced specific capacity and electrochemical performance for lithium-ion battery applications.
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.

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