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Facile fabrication of Si-embedded amorphous carbon@graphitic carbon composite microspheres via spray drying as high-performance lithium-ion battery anodes

Authors
Yang, Su HyunKim, Jin KooJung, Dae-SooKang, Yun Chan
Issue Date
30-12월-2022
Publisher
ELSEVIER
Keywords
Silicon anode; Lithium-ion batteries; 3D microsphere structure; Graphitic carbon; Spray drying
Citation
APPLIED SURFACE SCIENCE, v.606
Indexed
SCIE
SCOPUS
Journal Title
APPLIED SURFACE SCIENCE
Volume
606
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/145611
DOI
10.1016/j.apsusc.2022.154799
ISSN
0169-4332
Abstract
Silicon-nanoparticle-embedded amorphous carbon-graphitic carbon composite microspheres (denoted as Si/ AC@GC) with numerous empty voids are synthesized using a spray drying process. Spray dried composite microspheres consisting of Si nanopowders, dextrin, and iron salt are transformed to uniquely structured Si/ AC@GC microspheres via one-step carbonization followed by acid etching. The in situ formation of graphitic carbon with high electrical conductivity within the Si-C composite at a low carbonization temperature (700 degrees C) is achieved by applying a metallic Fe nanocatalyst. The Si/AC@GC microspheres exhibit higher electrochemical properties than bare Si nanopowders and Si/amorphous carbon composite microspheres (denoted as Si/AC) with filled structures. The synergistic effects of structural merits owing to the spherical morphology with empty nanovoids for liquid electrolyte penetration and a graphitic carbon layer with high electrical conductivity result in the superior lithium-ion storage performances of Si/AC@GC microsphere. The composite-based electrode delivers a high reversible capacity of 803 mA h g-1 after 200 cycles at 1.0 A g-1, indicating long-term cycling stability. Even at 5.0 A g-1, the electrode exhibits stable reversible discharge capacity of 589 mA h g-1 without significant capacity loss.
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