Biomass-Derived Heteroatom-Doped Carbon Aerogels from a Salt Melt Sol-Gel Synthesis and their Performance in Li-S Batteries

Florian Schipper, Alen Vizintin, Jiawen Ren, Robert Dominko, Tim Patrick Fellinger

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

An ionothermal sol-gel strategy to synthesize hierarchically porous carbon aerogels doped with different heteroatoms is presented by using biomass precursors in a scalable process. Morphologically similar but chemically different materials are used to study the influence of heteroatoms in Li-S batteries. The materials show capacities as high as 1290mAh g-1 in the first cycle using 50wt % S loading. Heteroatom doping reduces the capacity fading and the polarization throughout cycling. Zeta potential measurements reveal positive surface charges for heteroatom-doped carbons and indicate attractive interactions with polysulfides causing reduced fading. A polysulfide-selective sorption study reveals strongly different adsorption behavior depending on the carbon's chemical composition. Interestingly, the polysulfide fraction is also crucial. The results indicate that improved adsorption of long-chain polysulfides to doped carbons is related to improved capacity retention.

Original languageEnglish
Pages (from-to)3077-3083
Number of pages7
JournalChemSusChem
Volume8
Issue number18
DOIs
StatePublished - 21 Sep 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords

  • adsorption
  • batteries
  • carbon aerogels
  • doping
  • sulfides

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