Reconfiguration of lithium sulphur batteries: 'Enhancement of Li–S cell performance by employing a highly porous conductive separator coating'
| Autor: | Daniel Wadewitz, Eike Ahrens, Jürgen Eckert, Juan Balach, Lars Giebeler, Markus Klose, Ulrich Stoeck |
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| Rok vydání: | 2016 |
| Předmět: |
Chromatography
Materials science Renewable Energy Sustainability and the Environment Composite number Energy Engineering and Power Technology Separator (oil production) 02 engineering and technology Carbon black engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences law.invention Chemical engineering Coating law Electrode engineering Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Porosity FOIL method |
| Zdroj: | Journal of Power Sources. 309:76-81 |
| ISSN: | 0378-7753 |
| Popis: | Li–S batteries are an emerging technology and the most promising successor of current lithium ion technology. While there is great perspective in terms of superior theoretical specific capacity and energy density great challenges have to be addressed. One major challenge, severely limiting cycle performance and capacity retention, is the shuttling of polysulphide species. In this contribution we show a reconfiguration of the usual Li–S cell. Instead of generating a carbon/sulphur composite by melt infiltration a highly porous, conductive nitrogen-rich carbon material (TNC) is coated onto a commercial polypropylene separator foil. The thin conductive coating of TNC on the separator enables the application of very simple sulphur/carbon black cathodes. Because the melt infiltration of sulphur in a porous host material becomes unnecessary the electrode processing is significantly simplified. The specific capacity and cycling stability of reconfigurated cells are both improved significantly compared to the performance of a standard cell setup using a pristine separator. At a constant charging rate of C/5 cells with modified separator showed 2.5 times higher residual capacity (1016 mAh g−1) than cells with pristine separator (405 mAh g−1). |
| Databáze: | OpenAIRE |
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