Microporous novolac-derived carbon beads/sulfur hybrid cathode for lithium-sulfur batteries
Research output: Contribution to journal › Article › Research › peer-review
Standard
In: Journal of power sources, Vol. 357.2017, No. 31. July, 09.05.2017, p. 198-208.
Research output: Contribution to journal › Article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex - Download
}
RIS (suitable for import to EndNote) - Download
TY - JOUR
T1 - Microporous novolac-derived carbon beads/sulfur hybrid cathode for lithium-sulfur batteries
AU - Chourdhury, Soumyadip
AU - Krüner, Benjamin
AU - Massuti-Ballester, Pau
AU - Tolosa, Aura
AU - Prehal, Christian
AU - Grobelsek, Ingrid
AU - Paris, Oskar
AU - Borchardt, Lars
AU - Presser, Volker
PY - 2017/5/9
Y1 - 2017/5/9
N2 - Novolac-derived nanoporous carbon beads were used as conductive matrix for lithium-sulfur battery cathodes. We employed a facile self-emulsifying synthesis to obtain sub-micrometer novolac-derived carbon beads with nanopores. After pyrolysis, the carbon beads showed already a specific surface area of 640 m2 g-1 which was increased to 2080 m2 g-1 after physical activation. The non-activated and the activated carbon beads represent nanoporous carbon with a medium and a high surface area, respectively. This allows us to assess the influence of the porosity on the electrochemical performance of lithium-sulfur battery cathodes. The carbon/sulfur hybrids were obtained from two different approaches of sulfur infiltration: melt-infusion of sulfur (annealing) and in situ formation of sulfur from sodium thiosulfate. The best performance (∼880 mAh gsulfur-1 at low charge rate; 5th cycle) and high performance stability (>600 mAh gsulfur-1 after 100 cycles) were found for the activated carbon beads when using melt infusion of sulfur.
AB - Novolac-derived nanoporous carbon beads were used as conductive matrix for lithium-sulfur battery cathodes. We employed a facile self-emulsifying synthesis to obtain sub-micrometer novolac-derived carbon beads with nanopores. After pyrolysis, the carbon beads showed already a specific surface area of 640 m2 g-1 which was increased to 2080 m2 g-1 after physical activation. The non-activated and the activated carbon beads represent nanoporous carbon with a medium and a high surface area, respectively. This allows us to assess the influence of the porosity on the electrochemical performance of lithium-sulfur battery cathodes. The carbon/sulfur hybrids were obtained from two different approaches of sulfur infiltration: melt-infusion of sulfur (annealing) and in situ formation of sulfur from sodium thiosulfate. The best performance (∼880 mAh gsulfur-1 at low charge rate; 5th cycle) and high performance stability (>600 mAh gsulfur-1 after 100 cycles) were found for the activated carbon beads when using melt infusion of sulfur.
U2 - 10.1016/j.jpowsour.2017.05.005
DO - 10.1016/j.jpowsour.2017.05.005
M3 - Article
VL - 357.2017
SP - 198
EP - 208
JO - Journal of power sources
JF - Journal of power sources
SN - 0378-7753
IS - 31. July
ER -
