Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 15, Pages 8186-8197Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.01.151
Keywords
DC arc plasma; Ferric oxide; Carbon shell; Pseudo-capacitive; Anode; Lithium-ion batteries (LIBs)
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Funding
- National Natural Science Foundation of China of China [51331006, 51271044]
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A facile strategy of arc plasma followed by an annealing treatment was developed to fabricate the carbon-coated ferric oxide nanoparticles (Fe2O3@C) as the anode materials for LIBs. In the arc-discharge process, higher enthalpy of the plasma was realized by existence of active hydrogen atoms, which can greatly promote the evaporation of raw Fe2O3/solid graphite powers and give rise to the highly graphitized carbon shells. It is indicated that the core/shell nanostructure effectively preserves the structural/electrical integrity leading to the excellent cycling stability. Unlike the carbon coatings formed by wet chemical routes, such carbon layers feature dominant pseudo-capacitive behavior, stronger electric conductivity and better charge transfer ability, thus harvesting the superior rate capability. Benefiting from the structural advantages, the Fe2O3@C electrode delivers a reversible capacity higher than 500 mA h g(-1) at the current density of 5 A g(-1) after 500 cycles. The mechanisms of structural formation and the electrochemical activities have been revealed in details. The facile synthesis route and good electrochemical performances endow the Fe2O3@C nanoparticles with great potential to meet the requirements on high energy/ power and long lifespan for LIBs. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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