Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 43, Pages 18345-18352Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta03366c
Keywords
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Funding
- National Natural Science Foundation of China [51173042]
- Fundamental Research Funds for the Central Universities
- Shanghai Municipal Science and Technology Commission [12nm0504102]
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A novel PEDOT-PSS coated sulfur@activated porous graphene composite (PEDOT/S@aPG) is prepared by the impregnation of sulfur with aPG and encapsulation with PEDOT-PSS as the cathode material for lithium-sulfur batteries. The abundant nanopores and large surface area of aPG can provide an intimate contact and strong interaction with S species. Furthermore, the conductive PEDOT-PSS layer can facilitate the charge transportation and prevent the dissolution of polysulfides. As a result, the as-prepared PEDOT/S@aPG composite cathode with a sulfur content of about 60.1% shows a higher specific discharge capacity (1198 mA h g(-1) at 0.1 C) in the first cycle and good cycling stability, retaining a reversible capacity of 845 mA h g(-1) after 200 cycles. Moreover, the PEDOT/S@aPG cathode also exhibits excellent rate capability, showing a high reversible capacity of 718 mA h g(-1) at 2 C.
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