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Electrosprayed porous Fe3O4/carbon microspheres as anode materials for high-performance lithium-ion batteries

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Abstract

Porous Fe3O4/carbon microspheres (PFCMs) were successfully fabricated via a facile electrospray method and subsequent heat treatment, using ferrous acetylacetonate, carbon nanotubes (CNTs), Ketjen black (KB), polyvinylpyrrolidone (PVP), and polystyrene (PS) as raw materials. The porous carbon sphere framework decorated with well-dispersed CNTs and KB exhibits excellent electronic conductivity and acts as a good host to confine the Fe3O4 nanoparticles. The abundant mesopores in the carbon matrix derived from polymer pyrolysis can effectively accommodate the volume changes of Fe3O4 during the charge/discharge process, facilitate electrolyte penetration, and promote fast ion diffusion. Moreover, a thin amorphous carbon layer on the Fe3O4 nanoparticle formed during polymer carbonization can further alleviate the mechanical stress associated with volume changes, and preventing aggregation and exfoliation of Fe3O4 nanoparticles during cycling. Therefore, as anode materials for lithium-ion batteries, the PFCMs exhibited excellent cycling stability with high specific capacities, and outstanding rate performances. After 130 cycles at a small current density of 0.1 A·g–1, the reversible capacity of the PFCM electrode is maintained at almost 1,317 mAh·g–1. High capacities of 746 and 525 mAh·g–1 were still achieved after 300 cycles at the larger currents of 1 and 5 A·g–1, respectively. The optimized structure design and facile fabrication process provide a promising way for the utilization of energy storage materials, which have high capacities but whose performance is hindered by large volume changes and poor electrical conductivity in lithium or sodium ion batteries.

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Acknowledgements

This work was supported by the National Basic Research Program of China (No. 2014CB932400), Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics (Nos. U1330123 and U1401243), the National Natural Science Foundation of China (No. 51232005), and Shenzhen Technical Plan Project (No. JCYJ 20150529164918735).

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Authors and Affiliations

  1. Engineering Laboratory for Next Generation Power and Energy Storage Batteries, and Engineering Laboratory for Functionalized Carbon Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China

    Wenjie Han, Xianying Qin, Qing Li, Ming Liu, Yue Xia, Hongda Du, Baohua Li & Feiyu Kang

  2. School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Wenjie Han, Qing Li, Ming Liu & Feiyu Kang

  3. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

    Xianying Qin & Junxiong Wu

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  1. Wenjie Han
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  4. Qing Li
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Han, W., Qin, X., Wu, J. et al. Electrosprayed porous Fe3O4/carbon microspheres as anode materials for high-performance lithium-ion batteries. Nano Res. 11, 892–904 (2018). https://doi.org/10.1007/s12274-017-1700-6

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