On the mechanistic role of nitrogen-doped carbon cathodes in lithium-sulfur batteries with low electrolyte weight portion
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| Title: | On the mechanistic role of nitrogen-doped carbon cathodes in lithium-sulfur batteries with low electrolyte weight portion |
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| Authors: | Dörfler, Susanne, Strubel, Patrick, Jaumann, Tony, Troschke, Erik, Hippauf, Felix, Kensy, Christian, Schökel, Alexander, Althues, Holger, Giebeler, Lars, Oswald, Steffen, Kaskel, Stefan |
| Publication Year: | 2018 |
| Collection: | Publikationsdatenbank der Fraunhofer-Gesellschaft |
| Subject Terms: | cathode, conversion mechanism, lithium sulfur battery, nitrogen doped carbon, operando diffraction |
| Time: | 621, 531, 671 |
| Description: | S.116-128 ; The lithium-sulfur (Li-S) battery is a promising alternative to overcome capacity and specific energy limitations of common lithium-ion batteries. Highly porous, nitrogen-doped carbons as conductive host structures for sulfur/lithium sulfide deposition are shown herein to play a critical role in reversible cycling at low electrolyte/sulfur ratio. The pore geometry is precisely controlled by an efficient, scalable ZnO hard templating process. By using an electrolyte volume as low as 4 µL mg-1S, the beneficial nitrogen functionality leads to a twofold increased cell lifetime turning our findings highly favorable for real applications. Stable cycling of up to 156 cycles (59 cycles with undoped carbon) with high sulfur loadings of 3 mg cm-2 is achieved. Operando X-ray diffraction measurements during cycling show the transformation pathway of the sulfur - polysulfide - Li2S species. The observed intermediates critically depend on the nitrogen doping in the cathode carbon matrix. Nitrogen-doped carbons facilitate polysulfide adsorption promoting the nucleation of crystalline Li2S. These results provide new insights into the significant role of heteroatom doping for carbons in Li-S batteries with high specific energy. ; 54 |
| Document Type: | article in journal/newspaper |
| Language: | English |
| Relation: | Nano energy; StickLiS; BamoSa; 03XP0030; 03X4637; https://publica.fraunhofer.de/handle/publica/254647 |
| DOI: | 10.1016/j.nanoen.2018.09.065 |
| Availability: | https://publica.fraunhofer.de/handle/publica/254647 https://doi.org/10.1016/j.nanoen.2018.09.065 |
| Accession Number: | edsbas.9273C54D |
| Database: | BASE |
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