Extremely Small Pyrrhotite Fe7S8 Nanocrystals with Simultaneous Carbon-Encapsulation for High-Performance Na-Ion Batteries

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Na/FeSx batteries have remarkable potential applicability due to their high theoretical capacity and cost-effectiveness. However, realization of high power-capability and long-term cyclability remains a major challenge. Herein, ultrafine Fe7S8@C nanocrystals (NCs) as a promising anode material for a Na–ion battery that addresses the above two issues simultaneously is reported. An Fe7S8 core with quantum size (≈10 nm) overcomes the kinetic and thermodynamic constraints of the Na-S conversion reaction. In addition, the high degree of interconnection through carbon shells improves the electronic transport along the structure. As a result, the Fe7S8@C NCs electrode achieves excellent power capability of 550 mA h g−1 (≈79% retention of its theoretical capacity) at a current rate of 2700 mA g−1. Furthermore, a conformal carbon shell acts as a buffer layer to prevent severe volume change, which provides outstanding cyclability of ≈447 mA h g−1 after 1000 cycles (≈71% retention of the initial charge capacity).
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2018-01
Language
English
Article Type
Article
Citation

SMALL, v.14, no.2

ISSN
1613-6810
DOI
10.1002/smll.201702816
URI
http://hdl.handle.net/10203/240167
Appears in Collection
MS-Journal Papers(저널논문)
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