期刊
CHEMICAL ENGINEERING JOURNAL
卷 417, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129279
关键词
Heterostructure; Fe3Se4/FeSe; Carbon nanofibers; Sodium storage; Density Functional Theory
资金
- Fundamental Research Funds for the Central Universities, China [ZYGX2019J030]
- National Natural Science Foundation of China [11974004]
Researchers developed a Fe3Se4/FeSe heterostructure with improved capacity and cycling life for sodium-ion batteries, and Density Functional Theory calculations confirmed its enhancement on electronic conductivity and Na+ diffusion rate.
Looking for high-performance anode materials for the emerging sodium-ion batteries is an important topic for the research community. Even though iron selenides are promising candidates owning to their high theoretical capacities, they suffer from poor cycle life and inferior high-rate performance because of the conversion reaction during cycling and sluggish Na diffusion kinetics. In this work, we construct a Fe3Se4/FeSe heterostructure wrapped inside carbon nanofibers. When served as the anode material for sodium-ion batteries, the as-prepared sample presents a high capacity of 417.4 mAh g(-1) at 0.5 A g(-1) and a superior capacity retention of 89.1% after 1000 cycles at 5 A g(-1), outperforming the heterostructure-free counterpart of Fe3Se4@NCNF and many other FeSe-based anodes. Density Functional Theory calculation suggests that the Fe3Se4/FeSe interface would significantly improve the electronic conductivity, Na+ diffusion as well as structural stability of the electrode material.
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