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.
N1 - Funding Information:
This research was financed by the U.S. Department of Energy, Basic Energy Sciences , grant DE-AC02-06CH11357 through the Center for Electrical Energy Storage, an Energy Frontier Research Center. This work made use of the J.B. Cohen X-Ray Diffraction Facility at the Materials Research Center, the SEM and XPS in the EPIC and KECK-II facility of NUANCE Center at Northwestern University. Kai Han was supported by China Scholarship Council and Hunan Provincial Innovation Foundation for Postgraduate. Prof. Hongqi Ye was supported by National Natural Science Foundation of China ( 21276284 ).
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
AN - SCOPUS:84890820013
VL - 251
SP - 331
EP - 337
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -