Journal
APPLIED SURFACE SCIENCE
Volume 324, Issue -, Pages 399-404Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2014.10.176
Keywords
Lithium-sulfur batteries; Graphene-sulfur composites; Nanospheres; Electrochemical performance
Categories
Funding
- National Natural Science Foundation of China [21203168]
- Department of Science and Technology of Zhejiang Province [2013C31070]
- Open Fund of the Key laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province [2013001]
- Zhejiang Provincial Xinmiao Talent Project [2014R404068]
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Lithium-sulfur (Li-S) battery with high theoretical energy density is one of the most promising energy storage systems for electric vehicles and intermittent renewable energy. However, due to the poor conductivity of the active material, considerable weight of the electrode is occupied by the conductive additives. Here we report a graphene-wrapped sulfur nanospheres composite (S-nanosphere@G) with sulfur content up to 91 wt% as the high energy density cathode material for Li-S battery. The sulfur nanospheres with diameter of 400-500 nm are synthesized through a solution-based approach with the existence of polyvinylpyrrolidone (PVP). Then the sulfur nanospheres are uniformly wrapped by conductive graphene sheets through the electrostatic interaction between graphene oxide and PVP, followed by reducing of graphene oxide with hydrazine. The design of graphene wrapped sulfur nanoarchitecture provides flexible conductive graphene coating with void space to accommodate the volume expansion of sulfur and to minimize polysulfide dissolution. As a result, the S-nanosphere@G nanocomposite with 91 wt% sulfur shows a reversible initial capacity of 970 mA h g(-1) and an average columbic efficiency >96% over 100 cycles at a rate of 0.2 C. Taking the total mass of electrode into account, the S-nanosphere@G composite is a promising cathode material for high energy density Li-S batteries. (C) 2014 Elsevier B.V. All rights reserved.
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