Continuous-Flow Synthesis of Carbon-Coated Silicon/Iron Silicide Secondary Particles for Li-Ion Batteries.
Authors
Groombridge, Alexander S
De La Verpilliere, Jean
Lee, Jung Tae
Son, Yeonguk
Liang, Hsin-Ling
Publication Date
2020-01Journal Title
ACS nano
ISSN
1936-0851
Publisher
American Chemical Society
Volume
14
Issue
1
Pages
698-707
Language
eng
Type
Article
This Version
AM
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Jo, C., Groombridge, A. S., De La Verpilliere, J., Lee, J. T., Son, Y., Liang, H., Boies, A., & et al. (2020). Continuous-Flow Synthesis of Carbon-Coated Silicon/Iron Silicide Secondary Particles for Li-Ion Batteries.. ACS nano, 14 (1), 698-707. https://doi.org/10.1021/acsnano.9b07473
Abstract
The development of better Li-ion battery (LIB) electrodes requires an orchestrated effort to improve the active materials, as well as the electron and ion transport in the electrode. In this paper, iron-silicide is studied as an anode material for LIBs because of its higher conductivity and lower volume expansion compared to pure Si particles. In addition, carbon nanotubes (CNTs) can be synthesized from the surface of iron-silicides using a continuous flow coating process where precursors are first spray dried into micrometer scale secondary particles and are then flown through a chemical vapor deposition (CVD) reactor. The CNTs inside the secondary particles are important for short-range electrical transport and good utilization of the active material. Surface-bound CNTs on the secondary particles may help establishing a long-range conductivity. We also observed that these spherical secondary particles allow for better electrode coating quality, cyclability, and rate performance than unstructured materials with the same composition. The developed electrodes retain a gravimetric capacity of 1150 mAh/g over 300 cycles at 1A/g, as well as a 43% capacity retention at a rate of 5 C. Further, blended electrodes with graphite delivered a 539 mAh/g with high electrode density (~1.6 g/cc) and areal capacity (~3.5 mAh/cm2) with stable cycle performance.
Sponsorship
EPSRC ANAM grant (EP/M015211/1), ERC starting grant (HIENA – 337739) and MSCA-IF 796648 – URCHIN.
Funder references
EPSRC (EP/M015211/1)
European Commission Horizon 2020 (H2020) Marie Sklodowska-Curie actions (796648)
European Research Council (337739)
EPSRC (EP/M015211/1)
Identifiers
External DOI: https://doi.org/10.1021/acsnano.9b07473
This record's URL: https://www.repository.cam.ac.uk/handle/1810/299996
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