S-Doped Carbon-Coated FeS₂/C@C Nanorods for Potassium Storage

Xin Li¹，Huaping Wang¹，Wenchao Zhang²，Yuezhan Feng³，Jianmin Ma¹

1. School of Physics and Electronics,Hunan University2. Institute for Superconducting and Electronic Materials (ISEM), School of Mechanical, Materials, Mechatronics and Biomedical Engineering, Faculty of Engineering and Information Sciences,University of Wollongong3. Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education,Zhengzhou University

摘 要：Potassium-ion batteries（PIBs） are promising scalable energy storage system;however,one of the challenges for its potential application is the huge volume variations during cycling due to the insertion/extraction of large size potassium ions.Here,we fabricated the S-doped carbon-coated rod-like FeS₂/C@C,which not only effectively alleviate the volume variations upon cycling but also can improve electrical conductivity and maintain the structural integrity.As an anode material for PIBs,the rod-like FeS₂/C@C electrodes delivered excellent rate performance(175 mA h g^-1 at 0.5 A g^-1) and stable cycle performance(262 mA h g^-1 after 100 cycles at 0.1 A g^-1).The superior excellent performance is associated with the unique structure of FeS₂/C@C.The as-synthesized FeS₂/C@C is demonstrated to be a potential anode for PIBs.

关键词：