Journal
RSC ADVANCES
Volume 7, Issue 86, Pages 54453-54459Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ra09332b
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Funding
- Fundamental Research Funds for the Central Universities (HUST) [2016YXMS205]
- Creative Technology Project of Hubei Province [2016AAA048]
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Due to their unique and promising microstructures, sulfur/graphene aerogel composites have become more appealing for research interests than pristine carbon materials to improve the electrochemical performances of cathodes in lithium-sulfur batteries. Herein, we presented a facile no-slurry method to synthesize a three-dimensional polyvinylpyrrolidone-sulfur/graphene aerogel composite, which can be pressed into flexible sheets and directly used as a cathode without any additives. With a superior microstructure and high electrical conductivity, the as prepared cathode enables a high areal sulfur loading of 2.8 mg cm(-2), which delivers an initial gravimetric specific capacity of 1192.6 mA h g(-1) and an areal specific capacity of 3.34 mA h cm(-2) at 0.1C. After the first few cycles and stabilization, the cathode exhibits an excellent capacity retention of 94.6% from the 10th to 50th cycle, together with a great rate capability and cycling stability for 200 cycles at 0.5C. Moreover, this no-slurry method is convenient to be integrated with other composites, which has the potential to further improve the performances of lithium-sulfur batteries and simplify the preparation process.
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