Please use this identifier to cite or link to this item: https://doi.org/10.1039/c2jm30422h
Title: Nitrogen-doped carbon-encapsulation of Fe 3O 4 for increased reversibility in Li + storage by the conversion reaction
Authors: Ma, Y.
Zhang, C.
Ji, G.
Lee, J.Y. 
Issue Date: 28-Apr-2012
Citation: Ma, Y., Zhang, C., Ji, G., Lee, J.Y. (2012-04-28). Nitrogen-doped carbon-encapsulation of Fe 3O 4 for increased reversibility in Li + storage by the conversion reaction. Journal of Materials Chemistry 22 (16) : 7845-7850. ScholarBank@NUS Repository. https://doi.org/10.1039/c2jm30422h
Abstract: One great challenge in designing anode materials for lithium-ion batteries is to satisfy the concurrent requirements for good capacity retention, high rate performance and low first cycle losses. We report here the design and synthesis of a nitrogen-doped carbon encapsulated Fe 3O 4 composite which performed very well in all these areas. The composite with the optimized carbon content not only showed a high reversible capacity of ∼850 mA h g -1 for 50 cycles at 100 mA g -1, but was also able to maintain a stable cycling performance at a twenty-fold increase in current density to 2000 mA g -1. More importantly, the composite significantly lowered the irreversible capacity loss in the first cycle compared with other iron oxide anodes reported in the literature. Characterization of the electrode/electrolyte interface indicated the presence of a protective solid electrolyte interface (SEI) layer in which chemically stable LiF and FeF 3 were the major constituents. Thus, it is believed that the N-doped carbon coating had effectively modified the surface chemistry at the anode/electrolyte interface to increase the columbic efficiency of cycling and to reduce the secondary reactions in the first cycle of use. © 2012 The Royal Society of Chemistry.
Source Title: Journal of Materials Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/89586
ISSN: 09599428
DOI: 10.1039/c2jm30422h
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