Supercritical CO2 fluid assisted synthesis of Si-Fe-Fe3O4-C composites and lithium storage performance

LU Zhihang; MA Junkai; YANG Gangfeng; XIA Yang; GAN Yongping; ZHANG Jun; ZHANG Wenkui; HUANG Hui

doi:10.13801/j.cnki.fhclxb.20220126.003

Volume 40 Issue 1

Jan. 2023

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LU Zhihang, MA Junkai, YANG Gangfeng, et al. Supercritical CO2 fluid assisted synthesis of Si-Fe-Fe3O4-C composites and lithium storage performance[J]. Acta Materiae Compositae Sinica, 2023, 40(1): 171-179. doi: 10.13801/j.cnki.fhclxb.20220126.003

Citation:

LU Zhihang, MA Junkai, YANG Gangfeng, et al. Supercritical CO₂ fluid assisted synthesis of Si-Fe-Fe₃O₄-C composites and lithium storage performance[J]. Acta Materiae Compositae Sinica, 2023, 40(1): 171-179. doi: 10.13801/j.cnki.fhclxb.20220126.003

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Supercritical CO₂ fluid assisted synthesis of Si-Fe-Fe₃O₄-C composites and lithium storage performance

doi: 10.13801/j.cnki.fhclxb.20220126.003

College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Funds: National Natural Science Foundation of China-Joint Key Program(U20A20253)

Received Date: 2021-12-07
Accepted Date: 2022-01-15
Rev Recd Date: 2022-01-03

Available Online: 2022-01-28

Publish Date: 2023-01-15

Abstract

Abstract

Silicon-carbon anode is an important issue for the development of lithium-ion battery materials. Aiming at the problems of uneven combination and poor interfacial contact of silicon-carbon anode prepared by traditional ball milling, this paper proposes a new strategy to synthesize Si-Fe-Fe₃O₄-C composite by ball milling in supercritical carbon dioxide (scCO₂) fluid medium. It is found that during the process of ball milling mixture of nano-silicon and mesophase carbon microspheres (MCMB) in the scCO₂ medium, CO₂ and Fe reacts firstly to form a uniformly dispersed Si-FeCO₃-C precursor, and then in situ high temperature decomposition of FeCO₃ solid phase results in final Si-Fe-Fe₃O₄-C product. Under the infiltration of scCO₂ fluid, MCMB microspheres exfoliate into graphite flakes, and achieve ideal combination with nano-silicon and Fe-Fe₃O₄. The introduction of Fe-Fe₃O₄ in the composite has significantly improved the lithium storage capacity, cycle stability and rate performance of silicon-carbon anode, the synthesized Si-Fe-Fe₃O₄-C composite material maintains a reversible capacity of 1065 mA·h·g⁻¹ after 100 cycles at 0.2 A·g⁻¹. The method shows the merits of facile operation procedure, easy industrial production and potential commercial application basing on the supercritical fluid permeability and strong diffusion ability.
- silicon-carbon anode,
- supercritical fluid,
- CO₂,
- Si-Fe-Fe₃O₄-C composite material,
- lithium storage performance
Long Abstrsct
Innovation Points

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References(26)

References

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