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Dual yolk-shell structure of carbon and silica-coated silicon for high-performance lithium-ion batteries

Journal Article


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Abstract


  • Silicon batteries have attracted much attention in recent years due to their high theoretical capacity, although a rapid capacity fade is normally observed, attributed mainly to volume expansion during lithiation. Here, we report for the first time successful synthesis of Si/void/SiO 2 /void/C nanostructures. The synthesis strategy only involves selective etching of SiO 2 in Si/SiO 2 /C structures with hydrofluoric acid solution. Compared with reported results, such novel structures include a hard SiO 2 -coated layer, a conductive carbon-coated layer, and two internal void spaces. In the structures, the carbon can enhance conductivity, the SiO 2 layer has mechanically strong qualities, and the two internal void spaces can confine and accommodate volume expansion of silicon during lithiation. Therefore, these specially designed dual yolk-shell structures exhibit a stable and high capacity of 956mA hg -1 after 430 cycles with capacity retention of 83%, while the capacity of Si/C core-shell structures rapidly decreases in the first ten cycles under the same experimental conditions. The novel dual yolk-shell structures developed for Si can also be extended to other battery materials that undergo large volume changes.

Authors


  •   Yang, L Y. (external author)
  •   Lei, M (external author)
  •   Tang, S S. (external author)
  •   Liu, Jun (external author)
  •   Li, H Z. (external author)
  •   Sun, Ziqi

Publication Date


  • 2015

Citation


  • Yang, L. Y., Li, H. Z., Liu, J., Sun, Z. Q., Tang, S. S. & Lei, M. (2015). Dual yolk-shell structure of carbon and silica-coated silicon for high-performance lithium-ion batteries. Scientific Reports, 5 10908-1-10908-9.

Scopus Eid


  • 2-s2.0-84930672969

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2518&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1516

Has Global Citation Frequency


Number Of Pages


  • 0

Start Page


  • 10908-1

End Page


  • 10908-9

Volume


  • 5

Abstract


  • Silicon batteries have attracted much attention in recent years due to their high theoretical capacity, although a rapid capacity fade is normally observed, attributed mainly to volume expansion during lithiation. Here, we report for the first time successful synthesis of Si/void/SiO 2 /void/C nanostructures. The synthesis strategy only involves selective etching of SiO 2 in Si/SiO 2 /C structures with hydrofluoric acid solution. Compared with reported results, such novel structures include a hard SiO 2 -coated layer, a conductive carbon-coated layer, and two internal void spaces. In the structures, the carbon can enhance conductivity, the SiO 2 layer has mechanically strong qualities, and the two internal void spaces can confine and accommodate volume expansion of silicon during lithiation. Therefore, these specially designed dual yolk-shell structures exhibit a stable and high capacity of 956mA hg -1 after 430 cycles with capacity retention of 83%, while the capacity of Si/C core-shell structures rapidly decreases in the first ten cycles under the same experimental conditions. The novel dual yolk-shell structures developed for Si can also be extended to other battery materials that undergo large volume changes.

Authors


  •   Yang, L Y. (external author)
  •   Lei, M (external author)
  •   Tang, S S. (external author)
  •   Liu, Jun (external author)
  •   Li, H Z. (external author)
  •   Sun, Ziqi

Publication Date


  • 2015

Citation


  • Yang, L. Y., Li, H. Z., Liu, J., Sun, Z. Q., Tang, S. S. & Lei, M. (2015). Dual yolk-shell structure of carbon and silica-coated silicon for high-performance lithium-ion batteries. Scientific Reports, 5 10908-1-10908-9.

Scopus Eid


  • 2-s2.0-84930672969

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2518&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1516

Has Global Citation Frequency


Number Of Pages


  • 0

Start Page


  • 10908-1

End Page


  • 10908-9

Volume


  • 5