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Open AccessArticle

Biomass-Derived Graphitic Carbon Encapsulated Fe/Fe3C Composite as an Anode Material for High-Performance Lithium Ion Batteries

1
Institute of Chemical Power Sources, School of Science, Xi’an University of Technology, Xi’an 710048, China
2
Department of Chemical Engineering, Gyeongsang National University, 501 Jinju-daero, Jinju 52828, Korea
3
Department of Materials Engineering and Convergence Technology, Gyeongsang National University, 501 Jinju-daero, Jinju 52828, Korea
*
Authors to whom correspondence should be addressed.
Energies 2020, 13(4), 827; https://doi.org/10.3390/en13040827
Received: 31 December 2019 / Revised: 31 January 2020 / Accepted: 9 February 2020 / Published: 14 February 2020
(This article belongs to the Special Issue 2D Energy Materials)
Lithium ion (Li-ion) batteries have been widely applied to portable electronic devices and hybrid vehicles. In order to further enhance performance, the search for advanced anode materials to meet the growing demand for high-performance Li-ion batteries is significant. Fe3C as an anode material can contribute more capacity than its theoretical one due to the pseudocapacity on the interface. However, the traditional synthetic methods need harsh conditions, such as high temperature and hazardous and expensive chemical precursors. In this study, a graphitic carbon encapsulated Fe/Fe3C (denoted as Fe/Fe3[email protected]) composite was synthesized as an anode active material for high-performance lithium ion batteries by a simple and cost-effective approach through co-pyrolysis of biomass and iron precursor. The graphitic carbon shell formed by the carbonization of sawdust can improve the electrical conductivity and accommodate volume expansion during discharging. The porous microstructure of the shell can also provide increased active sites for the redox reactions. The in-situ-formed Fe/Fe3C nanoparticles show pseudocapacitive behavior that increases the capacity. The composite exhibits a high reversible capacity and excellent rate performance. The composite delivered a high initial discharge capacity of 1027 mAh g−1 at 45 mA g−1 and maintained a reversible capacity of 302 mAh g−1 at 200 mA g−1 after 200 cycles. Even at the high current density of 5000 mA g−1, the Fe/Fe3[email protected] cell also shows a stable cycling performance. Therefore, Fe/Fe3[email protected] composite is considered as one of the potential anode materials for lithium ion batteries. View Full-Text
Keywords: sawdust; graphitic carbon; Fe/Fe3C nanoparticle; lithium ion battery sawdust; graphitic carbon; Fe/Fe3C nanoparticle; lithium ion battery
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MDPI and ACS Style

Liu, Y.; Li, X.; Haridas, A.K.; Sun, Y.; Heo, J.; Ahn, J.-H.; Lee, Y. Biomass-Derived Graphitic Carbon Encapsulated Fe/Fe3C Composite as an Anode Material for High-Performance Lithium Ion Batteries. Energies 2020, 13, 827.

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