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Electrochemical behaviors of nitrogen-doped carbon nanofibers derived from polyacrylonitrile precursor at different pyrolysis temperatures in lithium sulfur batteries

YAO Shan-shan HE Yan-ping ARSLAN Majeed ZHANG Cui-juan SHEN Xiang-qian LI Tian-bao QIN Shi-biao

姚山山, 何燕苹, ArslanMajeed, 张翠娟, 沈湘黔, 黎天保, 覃事彪. 基于PAN前驱体不同热聚合温度制备NCFs在锂硫电池中的电化学行为[J]. 新型炭材料. doi: 10.1016/S1872-5805(21)60023-28
引用本文: 姚山山, 何燕苹, ArslanMajeed, 张翠娟, 沈湘黔, 黎天保, 覃事彪. 基于PAN前驱体不同热聚合温度制备NCFs在锂硫电池中的电化学行为[J]. 新型炭材料. doi: 10.1016/S1872-5805(21)60023-28
YAO Shan-shan, HE Yan-ping, ARSLAN Majeed, ZHANG Cui-juan, SHEN Xiang-qian, LI Tian-bao, QIN Shi-biao. Electrochemical behaviors of nitrogen-doped carbon nanofibers derived from polyacrylonitrile precursor at different pyrolysis temperatures in lithium sulfur batteries[J]. NEW CARBOM MATERIALS. doi: 10.1016/S1872-5805(21)60023-28
Citation: YAO Shan-shan, HE Yan-ping, ARSLAN Majeed, ZHANG Cui-juan, SHEN Xiang-qian, LI Tian-bao, QIN Shi-biao. Electrochemical behaviors of nitrogen-doped carbon nanofibers derived from polyacrylonitrile precursor at different pyrolysis temperatures in lithium sulfur batteries[J]. NEW CARBOM MATERIALS. doi: 10.1016/S1872-5805(21)60023-28

基于PAN前驱体不同热聚合温度制备NCFs在锂硫电池中的电化学行为

doi: 10.1016/S1872-5805(21)60023-28
详细信息
  • 中图分类号: TQ127.11

Electrochemical behaviors of nitrogen-doped carbon nanofibers derived from polyacrylonitrile precursor at different pyrolysis temperatures in lithium sulfur batteries

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  • 摘要: 基于电纺聚丙烯腈(PAN)前驱体,不同热聚合温度制备三维氮掺杂碳纳米纤维(NCFs)作为自支撑集流体,基于Li2S6溶液为活性物质。研究了不同聚合温度下制备的NCFs理化性能及其在锂硫电池中的电化学行为。研究结果表明,热聚合温度为900 ℃时制备的NCFs(NCFs-900)表现优异的电化学性能。当载硫量为4.19 mg·cm−2时,NCFs-900@Li2S6电极在0.2C下,初始放电容量为875 mAh·g−1,经250周循环后仍有707 mAh·g−1,库伦效率为98.55%。同时在高倍率1C下循环150周,容量保持率为81.53%。
  • Figure  1.  Schematic illustration of NCFs

    Figure  2.  (a) XRD patterns, (b) Raman spectra of NCFs; (c) N1s XPS spectra of (d) NCFs-800; (e) NCFs-900 and (f) NCFs-1000; HRTEM images of (g) NCFs-800; (h) NCFs-900 and (i) NCFs-1000

    Figure  3.  SEM images of (a) PAN nanofibers; (b) NCFs-800; (c) NCFs-900 and (d) NCFs-1000; (e) Cross section of NCFs-900

    Figure  4.  Electrochemical performances of NCFs@Li2S6 composite electrodes. (a) CV profiles at a scan rate of 0.1 mV s−1 and voltage range of 1.7−2.8 V; (b) Discharge profiles at 0.2 C; (c) Rate performances of NCFs@Li2S6 composite electrodes at various current densities from 0.1 C to 2 C; (d) Long cycling performance of NCFs@Li2S6 composite electrodes at 0. 2C; (e) Schematic of Li2S6 adsorption in the NCFs

    Figure  5.  (a) Nyquist plots of Li-S batteries with NCFs@Li2S6 electrode; (b) The relationship between the square root of the frequency (ω−0.5) and Zre in the low-frequency region

    Figure  6.  TEM images of NCFs-900 at different electron irradiation times: (a) 0s; (b) 5s; (c) 10s and (d) 15s; (e) The corresponding elemental mapping images of NCFs-900@Li2S6 electrode at charge state after 250 cycles

    Table  1.   Microstructure parameters of NCFs

    SamplesSurface
    area
    (m2· g−1)
    Pore
    volume
    (cm3· g−1)
    IG/IDElectronic conductivity
    (s·cm−1)
    D(002)
    (nm)
    NCFs-80083.670.070.930.260.358
    NCFs-900142.820.180.9912.190.357
    NCFs-1000130.600.271.132.780.355
    下载: 导出CSV

    Table  2.   The nitrogen functional groups distribution of NCFs obtained from XPS peak analysis

    SamplesNitrogen
    (at %)
    Pyridinc N
    (at %)
    Pyrrolic N
    (at %)
    Graphitic N
    (at %)
    NCFs-8009.024.013.341.67
    NCFs-9008.894.332.751.81
    NCFs-10007.963.532.671.78
    下载: 导出CSV
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  • 收稿日期:  2020-05-25
  • 修回日期:  2020-09-01
  • 网络出版日期:  2021-04-02

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