Abstract
A lithium sulfide-reduced graphene oxide nanocomposite (Li 2S-rGO) was synthesized and evaluated as the cathode material and Li source for the assembly of Li-S batteries. The composite, with a unique 3-D pocket structure, was synthesized by a combination of facile solution chemistry and thermal treatment. The as-prepared Li2S-rGO nanocomposites were characterized by X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy, which showed 20-40 nm Li2S particles homogeneously dispersed between reduced graphene oxide sheets. Li2S contents as high as ∼66% could be obtained. When used with an electrolyte containing LiNO3 and polysulfide, the Li2S-rGO nanocomposites exhibited a high initial capacity of 982 mAh g-1 Li2S. However, there was noticeable capacity fade in subsequent cycles, probably due to polysulfide dissolution and the shuttle mechanism, but a capacity of 315 mAh g-1 could still be obtained after 100 cycles, with 90-95% coulomb efficiency. The effect of polysulfide additive in the electrolyte on the activation of Li2S in the first delithiation step was discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 331-337 |
| Number of pages | 7 |
| Journal | Journal of Power Sources |
| Volume | 251 |
| DOIs | |
| Publication status | Published - Apr 1 2014 |
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Keywords
- Battery
- Cathode
- Lithium
- Polysulfide
- Sulfide
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Energy Engineering and Power Technology
- Renewable Energy, Sustainability and the Environment
- Physical and Theoretical Chemistry
Cite this
Li2S-reduced graphene oxide nanocomposites as cathode material for lithium sulfur batteries. / Han, Kai; Shen, Jingmei; Hayner, Cary M.; Ye, Hongqi; Kung, Mayfair C.; Kung, Harold H.
In: Journal of Power Sources, Vol. 251, 01.04.2014, p. 331-337.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Li2S-reduced graphene oxide nanocomposites as cathode material for lithium sulfur batteries
AU - Han, Kai
AU - Shen, Jingmei
AU - Hayner, Cary M.
AU - Ye, Hongqi
AU - Kung, Mayfair C.
AU - Kung, Harold H
PY - 2014/4/1
Y1 - 2014/4/1
N2 - A lithium sulfide-reduced graphene oxide nanocomposite (Li 2S-rGO) was synthesized and evaluated as the cathode material and Li source for the assembly of Li-S batteries. The composite, with a unique 3-D pocket structure, was synthesized by a combination of facile solution chemistry and thermal treatment. The as-prepared Li2S-rGO nanocomposites were characterized by X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy, which showed 20-40 nm Li2S particles homogeneously dispersed between reduced graphene oxide sheets. Li2S contents as high as ∼66% could be obtained. When used with an electrolyte containing LiNO3 and polysulfide, the Li2S-rGO nanocomposites exhibited a high initial capacity of 982 mAh g-1 Li2S. However, there was noticeable capacity fade in subsequent cycles, probably due to polysulfide dissolution and the shuttle mechanism, but a capacity of 315 mAh g-1 could still be obtained after 100 cycles, with 90-95% coulomb efficiency. The effect of polysulfide additive in the electrolyte on the activation of Li2S in the first delithiation step was discussed.
AB - A lithium sulfide-reduced graphene oxide nanocomposite (Li 2S-rGO) was synthesized and evaluated as the cathode material and Li source for the assembly of Li-S batteries. The composite, with a unique 3-D pocket structure, was synthesized by a combination of facile solution chemistry and thermal treatment. The as-prepared Li2S-rGO nanocomposites were characterized by X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy, which showed 20-40 nm Li2S particles homogeneously dispersed between reduced graphene oxide sheets. Li2S contents as high as ∼66% could be obtained. When used with an electrolyte containing LiNO3 and polysulfide, the Li2S-rGO nanocomposites exhibited a high initial capacity of 982 mAh g-1 Li2S. However, there was noticeable capacity fade in subsequent cycles, probably due to polysulfide dissolution and the shuttle mechanism, but a capacity of 315 mAh g-1 could still be obtained after 100 cycles, with 90-95% coulomb efficiency. The effect of polysulfide additive in the electrolyte on the activation of Li2S in the first delithiation step was discussed.
KW - Battery
KW - Cathode
KW - Lithium
KW - Polysulfide
KW - Sulfide
UR - http://www.scopus.com/inward/record.url?scp=84890820013&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84890820013&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2013.11.062
DO - 10.1016/j.jpowsour.2013.11.062
M3 - Article
VL - 251
SP - 331
EP - 337
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -