Abstract
This paper reports unique highly porous carbon-coated Si nanoparticles with canyon-like surfaces (cpSi@C) prepared by pseudomorphic transformation of wrinkled silica nanoparticles (WSNs) via magnesiothermic reduction and subsequent pyrolytic deposition of carbon. The pseudomorphic transformation of soft-template-based WSNs with large pore dimensions provides Si nanoparticles with additional porosity owing to their unique canyon-like surface structure. This degree of porosity is not achievable using conventional soft-template-derived porous SiO2 materials owing to their smaller pore dimensions. The free volume space in the cpSi@C particles is 419% of their Si volume, which is sufficient to fully accommodate Si volume expansion during cycling. Furthermore, the conformal carbon coating allows cpSi@C to enhance its electrical conductivity. cpSi@C exhibits a high specific charge capacity of 822 mA h g-1 after 200 cycles at a current density of 0.5 A g-1, which is 59.1% of the initial charge capacity. A comparative study with respect to other porous Si-based materials clearly revealed that the unique canyon-like structure synthesized in this study, with its additional pore volume and smaller Si dimensions, exhibits enhanced electrochemical performance.
| Original language | English |
|---|---|
| Pages (from-to) | 3028-3037 |
| Number of pages | 10 |
| Journal | Journal of Materials Chemistry A |
| Volume | 6 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 2018 Jan 1 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
Cite this
}
Highly porous carbon-coated silicon nanoparticles with canyon-like surfaces as a high-performance anode material for Li-ion batteries. / Kim, Bokyung; Ahn, Jihoon; Oh, Yunjung; Tan, Jeiwan; Lee, Daehee; Lee, Jin Kyu; Moon, Joo Ho.
In: Journal of Materials Chemistry A, Vol. 6, No. 7, 01.01.2018, p. 3028-3037.Research output: Contribution to journal › Article
TY - JOUR
T1 - Highly porous carbon-coated silicon nanoparticles with canyon-like surfaces as a high-performance anode material for Li-ion batteries
AU - Kim, Bokyung
AU - Ahn, Jihoon
AU - Oh, Yunjung
AU - Tan, Jeiwan
AU - Lee, Daehee
AU - Lee, Jin Kyu
AU - Moon, Joo Ho
PY - 2018/1/1
Y1 - 2018/1/1
N2 - This paper reports unique highly porous carbon-coated Si nanoparticles with canyon-like surfaces (cpSi@C) prepared by pseudomorphic transformation of wrinkled silica nanoparticles (WSNs) via magnesiothermic reduction and subsequent pyrolytic deposition of carbon. The pseudomorphic transformation of soft-template-based WSNs with large pore dimensions provides Si nanoparticles with additional porosity owing to their unique canyon-like surface structure. This degree of porosity is not achievable using conventional soft-template-derived porous SiO2 materials owing to their smaller pore dimensions. The free volume space in the cpSi@C particles is 419% of their Si volume, which is sufficient to fully accommodate Si volume expansion during cycling. Furthermore, the conformal carbon coating allows cpSi@C to enhance its electrical conductivity. cpSi@C exhibits a high specific charge capacity of 822 mA h g-1 after 200 cycles at a current density of 0.5 A g-1, which is 59.1% of the initial charge capacity. A comparative study with respect to other porous Si-based materials clearly revealed that the unique canyon-like structure synthesized in this study, with its additional pore volume and smaller Si dimensions, exhibits enhanced electrochemical performance.
AB - This paper reports unique highly porous carbon-coated Si nanoparticles with canyon-like surfaces (cpSi@C) prepared by pseudomorphic transformation of wrinkled silica nanoparticles (WSNs) via magnesiothermic reduction and subsequent pyrolytic deposition of carbon. The pseudomorphic transformation of soft-template-based WSNs with large pore dimensions provides Si nanoparticles with additional porosity owing to their unique canyon-like surface structure. This degree of porosity is not achievable using conventional soft-template-derived porous SiO2 materials owing to their smaller pore dimensions. The free volume space in the cpSi@C particles is 419% of their Si volume, which is sufficient to fully accommodate Si volume expansion during cycling. Furthermore, the conformal carbon coating allows cpSi@C to enhance its electrical conductivity. cpSi@C exhibits a high specific charge capacity of 822 mA h g-1 after 200 cycles at a current density of 0.5 A g-1, which is 59.1% of the initial charge capacity. A comparative study with respect to other porous Si-based materials clearly revealed that the unique canyon-like structure synthesized in this study, with its additional pore volume and smaller Si dimensions, exhibits enhanced electrochemical performance.
UR - http://www.scopus.com/inward/record.url?scp=85042148471&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85042148471&partnerID=8YFLogxK
U2 - 10.1039/c7ta10093k
DO - 10.1039/c7ta10093k
M3 - Article
VL - 6
SP - 3028
EP - 3037
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
SN - 2050-7488
IS - 7
ER -