期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 240, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2019.122139
关键词
Electrospun; Na-ion batteries; Carbon nanofiber; Antimony sulfide; Multichannel mesopores
资金
- National Natural Science Foundation of China [51502135]
- Primary Research & Developement Plan of Jiangsu Province [BE2016183]
Sodium-ion batteries with potentially low cost is an alternative to lithium-ion batteries for large-scale energy storage. However, developing high energy density and ultralong cycle life electrodes for sodium-ion batteries is a key issue due to the larger radius of Na+ than Li+ and the sluggish sodium intercalation kinetics. One-step electrospinning process has been applied to synthesis Sb2S3 nanocrystals hosted in multichannel porous N-doped carbon nanofiber (CNF). Sb2S3 nanoparticles with diameter of 10-50 nm were uniformly embedded in CNF, while the multichannel pores of CNF act as a buffer to restrict the volume expansion of Sb(2)S(3)during cycling. Sb2S3@N-doped carbon nanofiber (Sb2S3@CNF) delivered a specific capacity of 311 mAh g(-1) at 100 mA g(-1) with a capacity retention of 87% after 1000 cycles at 1A g(-1), corresponding to a capacity decay rate of only 0.013% per cycle. Benefited from the unique multichannel mesoporous structure, charge storage of Sb2S3@CNF is mainly contributed by a surface capacitive process indicating significantly enhanced mass diffusion properties. The as-developed nanofibers with a cylindrical porous structure by a one-step electrospinning method can be an excellent host for electroactive materials to achieve ultralong cycle life.
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