能源化学(英文版)

能源化学(英文) ›› 2019, Vol. 28 ›› Issue (7): 43-51.DOI: 10.1016/j.jechem.2018.09.017

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Strongly coupled N-doped carbon/Fe3O4/N-doped carbon hierarchical micro/nanostructures for enhanced lithium storage performance

Tiantian Maa, Xianghong Liua,b, Li Suna, Yongshan Xua, Lingli Zhenga, Jun Zhanga,b   

  1. a College of Physics, Qingdao University, Qingdao 266071, Shandong, China;
    b Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education), Nankai University, Tianjin 300071, China
  • 收稿日期:2018-08-14 修回日期:2018-09-12 出版日期:2019-07-15 发布日期:2019-07-15
  • 通讯作者: Xianghong Liu, Jun Zhang
  • 基金资助:
    This work is financially supported by the National Natural Science Foundation of China (Nos. 21601098 and 51602167), Shandong Provincial Science Foundation (ZR2016EMB07 and ZR2017JL021) and Key Research and Development Program (2018GGX102033), and Qingdao Applied Fundamental Research Project (16-5-1-92-jch and 17-1-1-81-jch).

Strongly coupled N-doped carbon/Fe3O4/N-doped carbon hierarchical micro/nanostructures for enhanced lithium storage performance

Tiantian Maa, Xianghong Liua,b, Li Suna, Yongshan Xua, Lingli Zhenga, Jun Zhanga,b   

  1. a College of Physics, Qingdao University, Qingdao 266071, Shandong, China;
    b Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education), Nankai University, Tianjin 300071, China
  • Received:2018-08-14 Revised:2018-09-12 Online:2019-07-15 Published:2019-07-15
  • Contact: Xianghong Liu, Jun Zhang
  • Supported by:
    This work is financially supported by the National Natural Science Foundation of China (Nos. 21601098 and 51602167), Shandong Provincial Science Foundation (ZR2016EMB07 and ZR2017JL021) and Key Research and Development Program (2018GGX102033), and Qingdao Applied Fundamental Research Project (16-5-1-92-jch and 17-1-1-81-jch).

摘要： 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 mA h g-1 after 100 cycles at a current density of 100 mA g-1 and very good rate capability (470 mA h g-1 at 2 A g-1), which significantly surpasses the performance of Fe3O4@N-C. TEM analysis reveals that after battery cycling the FeOx particles detached from the carbon fibers for Fe3O4@N-C, while for N-C@Fe3O4@N-C the FeOx particles 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 Fe3O4 and 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.

关键词: Iron oxide, Micro/nanostructures, Carbon tubes, Anode, Coupling

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 mA h g-1 after 100 cycles at a current density of 100 mA g-1 and very good rate capability (470 mA h g-1 at 2 A g-1), which significantly surpasses the performance of Fe3O4@N-C. TEM analysis reveals that after battery cycling the FeOx particles detached from the carbon fibers for Fe3O4@N-C, while for N-C@Fe3O4@N-C the FeOx particles 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 Fe3O4 and 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.

Key words: Iron oxide, Micro/nanostructures, Carbon tubes, Anode, Coupling