Microporous novolac-derived carbon beads/sulfur hybrid cathode for lithium-sulfur batteries
Research output: Contribution to journal › Article › Research › peer-review
Authors
Organisational units
External Organisational units
- INM-Leibniz Institute for New Materials
- Saarbrücken
- TU Dresden
Abstract
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.
Details
Original language | English |
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Pages (from-to) | 198-208 |
Number of pages | 11 |
Journal | Journal of power sources |
Volume | 357.2017 |
Issue number | 31. July |
DOIs | |
Publication status | E-pub ahead of print - 9 May 2017 |