本文主要研究内容
作者（2019）在《Strongly coupled N-doped carbon/Fe3O4/N-doped carbon hierarchical micro/nanostructures for enhanced lithium storage performance》一文中研究指出：A strong interface coupling is of vital importance to develop metal oxide/carbon nanocomposite anodes for next-generation lithium ion batteries.Herein,a rational N-doped carbon riveting strategy is designed to boost the lithium storage performance of Fe3O4/N-doped carbon tubular structures.Polypyrrole（PPy）has been used as the precursor for N-doped carbon.N-doped carbon-riveted Fe3O4/N-doped carbon（N–C@Fe3O4@N–C）nanocomposites were obtained by pyrolysis of PPy-coated FeOOH@PPy nanotubes in Ar atmosphere.When tested as an anode for LIBs,the N–C@Fe3O4@N–C displays a high reversible discharge capacity of 675.8 m A h g-1after 100 cycles at a current density of 100 m A g-1and very good rate capability(470 mA h g-1at 2 A g-1),which significantly surpasses the performance of Fe3O4@N–C.TEM analysis reveals that after battery cycling the FeOxparticles detached from the carbon fibers for Fe3O4@N–C,while for N–C@Fe3O4@N–C the FeOxparticles were still trapped in the carbon matrix,thus preserving good electrical contact.Consequently,the superior performance of N–C@Fe3O4@N–C is attributed to the synergistic effect between Fe3O4and N-doped carbon combined with the unique structure properties of the nanocomposites.The strategy reported in this work is expected to be applicable for designing other electrode materials for LIBs.
Abstract
A strong interface coupling is of vital importance to develop metal oxide/carbon nanocomposite anodes for next-generation lithium ion batteries.Herein,a rational N-doped carbon riveting strategy is designed to boost the lithium storage performance of Fe3O4/N-doped carbon tubular structures.Polypyrrole（PPy）has been used as the precursor for N-doped carbon.N-doped carbon-riveted Fe3O4/N-doped carbon（N–C@Fe3O4@N–C）nanocomposites were obtained by pyrolysis of PPy-coated FeOOH@PPy nanotubes in Ar atmosphere.When tested as an anode for LIBs,the N–C@Fe3O4@N–C displays a high reversible discharge capacity of 675.8 m A h g-1after 100 cycles at a current density of 100 m A g-1and very good rate capability(470 mA h g-1at 2 A g-1),which significantly surpasses the performance of Fe3O4@N–C.TEM analysis reveals that after battery cycling the FeOxparticles detached from the carbon fibers for Fe3O4@N–C,while for N–C@Fe3O4@N–C the FeOxparticles were still trapped in the carbon matrix,thus preserving good electrical contact.Consequently,the superior performance of N–C@Fe3O4@N–C is attributed to the synergistic effect between Fe3O4and N-doped carbon combined with the unique structure properties of the nanocomposites.The strategy reported in this work is expected to be applicable for designing other electrode materials for LIBs.
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