期刊
SMALL
卷 14, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201702816
关键词
carbon shells; colloidal nanocrystals; one-pot synthesis; pyrrhotite; sodium-ion batteries
类别
资金
- Climate Change Research Hub of KAIST [N11170059]
- KIST Institutional Program [2E27301]
- National Research Foundation of Korea (NRF) - Ministry of Science ICT [2017M2A2A6A01070834]
- National Research Foundation of Korea [2017M2A2A6A01070834] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 (approximate to 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) (approximate to 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 approximate to 447 mA h g(-1) after 1000 cycles (approximate to 71% retention of the initial charge capacity).
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