Abstract
To overcome the low electrical conductivity and large volume expansion of a sulfur cathode during electrochemical reactions, a composite of SnO2 nanoparticles with 5–10 nm size dispersed on reduced graphene oxide (rGO) sheets and sulfur (rGO/SnO2/S) was prepared by a one-pot hydrothermal process. This cathode shows 1.2-fold higher interfacial Li ion diffusivity (1.8 × 10−12 cm2 s−1) than that of an rGO/S cathode (1.5 × 10−12 cm2 s−1). This improvement is attributed to the synergistic effect of the hybrid matrix comprising rGO sheets and SnO2. The rGO sheets provide a fast electron pathway and accommodate a large amount of sulfur. Moreover, the dispersed SnO2 nanoparticle acts as an immobilizer to prevent the dissolution of polysulfide during the electrochemical reaction. The synthesized rGO/SnO2/S cathode also exhibits an electrical resistivity of 4.4 × 10−1 Ω cm due to interfacial modification. Further, it exhibits improved electrochemical performance with an initial discharge capacity of 1591.57 mA h g−1 at 0.1 C, which stabilizes to 606.98 mA h g−1 at 0.2 C after 100 cycles. In addition, it shows a discharge capacity of 575.45 mA h g−1 even at a high current density of 5 C.
| Original language | English |
|---|---|
| Journal | Applied Surface Science |
| DOIs | |
| Publication status | Accepted/In press - 2018 Jan 1 |
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Keywords
- Immobilizer of polysulfide
- One-pot hydrothermal process
- Reduced graphene oxide (rGO)
- Surface diffusion
- Tin oxide (SnO) nano particles
ASJC Scopus subject areas
- Surfaces, Coatings and Films
Cite this
Design and synthesis of an interfacial layer of the polysulfide immobilizer for lithium-sulfur batteries by the one-pot hydrothermal method. / Yu, Hyunjin; Byun, Dong Jin; Lee, Joong Kee.
In: Applied Surface Science, 01.01.2018.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Design and synthesis of an interfacial layer of the polysulfide immobilizer for lithium-sulfur batteries by the one-pot hydrothermal method
AU - Yu, Hyunjin
AU - Byun, Dong Jin
AU - Lee, Joong Kee
PY - 2018/1/1
Y1 - 2018/1/1
N2 - To overcome the low electrical conductivity and large volume expansion of a sulfur cathode during electrochemical reactions, a composite of SnO2 nanoparticles with 5–10 nm size dispersed on reduced graphene oxide (rGO) sheets and sulfur (rGO/SnO2/S) was prepared by a one-pot hydrothermal process. This cathode shows 1.2-fold higher interfacial Li ion diffusivity (1.8 × 10−12 cm2 s−1) than that of an rGO/S cathode (1.5 × 10−12 cm2 s−1). This improvement is attributed to the synergistic effect of the hybrid matrix comprising rGO sheets and SnO2. The rGO sheets provide a fast electron pathway and accommodate a large amount of sulfur. Moreover, the dispersed SnO2 nanoparticle acts as an immobilizer to prevent the dissolution of polysulfide during the electrochemical reaction. The synthesized rGO/SnO2/S cathode also exhibits an electrical resistivity of 4.4 × 10−1 Ω cm due to interfacial modification. Further, it exhibits improved electrochemical performance with an initial discharge capacity of 1591.57 mA h g−1 at 0.1 C, which stabilizes to 606.98 mA h g−1 at 0.2 C after 100 cycles. In addition, it shows a discharge capacity of 575.45 mA h g−1 even at a high current density of 5 C.
AB - To overcome the low electrical conductivity and large volume expansion of a sulfur cathode during electrochemical reactions, a composite of SnO2 nanoparticles with 5–10 nm size dispersed on reduced graphene oxide (rGO) sheets and sulfur (rGO/SnO2/S) was prepared by a one-pot hydrothermal process. This cathode shows 1.2-fold higher interfacial Li ion diffusivity (1.8 × 10−12 cm2 s−1) than that of an rGO/S cathode (1.5 × 10−12 cm2 s−1). This improvement is attributed to the synergistic effect of the hybrid matrix comprising rGO sheets and SnO2. The rGO sheets provide a fast electron pathway and accommodate a large amount of sulfur. Moreover, the dispersed SnO2 nanoparticle acts as an immobilizer to prevent the dissolution of polysulfide during the electrochemical reaction. The synthesized rGO/SnO2/S cathode also exhibits an electrical resistivity of 4.4 × 10−1 Ω cm due to interfacial modification. Further, it exhibits improved electrochemical performance with an initial discharge capacity of 1591.57 mA h g−1 at 0.1 C, which stabilizes to 606.98 mA h g−1 at 0.2 C after 100 cycles. In addition, it shows a discharge capacity of 575.45 mA h g−1 even at a high current density of 5 C.
KW - Immobilizer of polysulfide
KW - One-pot hydrothermal process
KW - Reduced graphene oxide (rGO)
KW - Surface diffusion
KW - Tin oxide (SnO) nano particles
UR - http://www.scopus.com/inward/record.url?scp=85048459398&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85048459398&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2018.05.212
DO - 10.1016/j.apsusc.2018.05.212
M3 - Article
AN - SCOPUS:85048459398
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
ER -