Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (2): 603-608.doi: 10.1007/s40242-021-1157-8

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N-Doped Carbon Nanofibers Encapsulating CoO@Co9S8 Nanoparticles: Preparation from S-Rich Co32 Coordination Cluster Precursors by Electrospinning and Application for Superior Li-ion Storage

YANG Siran, AI Feixue, LI Ziping, ZHAO Guiyan, BI Yanfeng   

  1. School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, P. R. China
  • Received:2021-04-05 Revised:2021-05-07 Online:2022-04-01 Published:2021-05-08
  • Contact: BI Yanfeng, ZHAO Guiyan E-mail:biyanfeng@lnpu.edu.cn;gyzhao@lnpu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No.91961110), the Liaoning Revitalization Talents Program, China (No.XLYC1807059), and the Talent Scientific Research/Scientific Research Cultivation Fund of Liaoning Petrochemical University, China(Nos.2016XJJ-001/ 2016PY-014).

Abstract: Thiacalixarene-supported Co32nanoclusters encapsulated in polyacrylonitrile nanofibers(Co32@PAN-NFs) by electrospinning have been utilized as precursors to fabricate N-doped CoO@Co9S8 carbon nanofibers(CoO@Co9S8@CNFs) for superior Li-ion storage. The S-rich Co32 clusters capped by organic sheets afforded the well dispersed cobalt oxide/sulfide nanoparticles embedded in carbon nanofiber composites by direct calcination. The N-doped CoO@Co9S8@CNFs nanocomposites have been utilized as anode materials for lithium ion battery with the reversible capabilities being of 1051.8, 967.6, 894.7, 782.7, 669.5 and 525.4 mA·h/g at 0.1, 0.2, 0.5, 1, 2 and 3 A/g, respectively. The CoO@Co9S8@CNFs also showed a relatively high stable capacity of 551.7 mA·h/g at the current density of 1 A/g after 200 cycles of rate experiments. The as-obtained N-doped CoO@Co9S8@CNFs nanocomposites exhibited superior reversible capacity, rate performance, Coulomb efficiency(74.5% vs. 63.9%) and cyclic stability comparing with the CoO@Co9S8@C derived from simple annealing of Co32 templates.

Key words: Metal cluster precursor, Carbon nanofiber, Electrospinning, Li-ion storage