期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 655, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.129721
关键词
Lithium-ion battery; Silicon anode; Carbon nanofiber; Electrospinning
资金
- Fundamental Research Funds for the Central Universities [22D110632]
- Open project of Shanghai Collaborative Innovation Center of High Performance Fibers and Com- posites (Province-Minitry) [X12812101/013]
- Key Support Project of State Key Laboratory for Modification of Chemical Fibers and Polymer Materials [21M1060212]
- Large Aircraft Special Fund of State Key Laboratory for Modification of Chemical Fibers and Polymer Materials [21M1060275]
Silicon/carbon@porous carbon nanofiber composites prepared by coaxial electrospinning exhibit excellent electrochemical performance and have the potential to be used as high-performance anodes in lithium-ion batteries (LIBs).
Silicon-based electrodes hold a great potential application in lithium-ion batteries (LIBs) due to the high-energy -density. However, huge volume expansion and poor electric conductivity hinder the commercial application of silicon-based materials. To alleviate these problems, two different hierarchical core-shell composites, silicon/ carbon@porous carbon nanofibers (Si/C@PCNF) and silicon@hollow porous carbon nanofiber (Si@HPCNF) are designed and prepared through coaxial electrospinning. The shell layer prevents silicon contacting with elec-trolyte directly, and the porous carbon nanofibers shorten Li+ diffusion distance and facilitate ion transport. Compared with Si@HPCNF composites, Si/C@PCNF composites achieve a better electrochemical performance owing to the high surface area (68.05 m2/g) and the fact that silicon nanoparticles are connected to each other by porous carbon in the core. The Si/C@PCNF electrodes deliver a large reversible capacity (842.1 mAh center dot g 1 after 500 cycles at 0.5 A center dot g 1), a good rate capability (1366.6 mAh center dot g 1 at 0.5 A center dot g 1) and an excellent cycle stability (420.3 mAh center dot g-1 at 2.0 A center dot g-1 after 1000 cycles), indicating that it can be served as a promising anode for high-performance LIBs.
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