Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 780, Issue -, Pages 19-25Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2016.08.040
Keywords
Lithium sulfur battery; Cathode; Reduced graphene oxide; Graphene scroll; Porous carbon structure
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2015R1D1A1A01060398]
- Ministry of Science, ICT and Future Planning, Republic of Korea, as Global Frontier Project [CISS-012M3A6A6054186]
- [NRF2015K2A2A2002209]
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For large scale batteries, sulfur is an attractive cathode active material for lithium batteries because of high theoretical capacity of 1675 mA hg(-1). However, severe capacity fading and low conductivity of sulfur are significant challenges for its practical application. Here, we report a facile approach to prepare reduced graphene oxide nanoscroll embedded with well-dispersed sulfur (S/GNSC) through a one-pot oxidation of sulfide and reduction of graphene oxide followed by freeze-casting process to generate graphene nanoscroll. The S/GNSC takes the novel shape of reduced graphene oxide sheet spirally wrapped into one-dimensional tubular structure, which enhances electrochemical performance by acting as physical barrier to prevent polysulfide from dissolving and an effective network to promote electron and Li+ transport during reaction. Therefore, the S/GNSC composite with high sulfur loading of 76 wt% exhibits high initial capacity of 1295 mA h g(-1) and reversible capacity of 744 mA h g(-1) after the 100th cycle at 0.2 degrees C when it is used as a cathode material for lithium-sulfur battery, while the capacity of sulfur loaded on reduced graphene oxide sheet (S/rGO) is continuously fading to 510 mA h g(-1) after the 100th cycle due to the irreversible loss of polysulfide. (C) 2016 Elsevier B.V. All rights reserved.
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