We show full Li/S cells with the use of balanced and high capacity electrodes to address high power electro-mobile applications. The anode is made of an assembly comprising of silicon nanowires as active material densely and conformally grown on a 3D carbon mesh as a light-weight current collector, offering extremely high areal capacity for reversible Li storage of up to 9 mAh/cm(2). The dense growth is guaranteed by a versatile Au precursor developed for homogenous Au layer deposition on 3D substrates. In contrast to metallic Li, the presented system exhibits superior characteristics as an anode in Li/S batteries such as safe operation, long cycle life and easy handling. These anodes are combined with high area density S/C composite cathodes into a Li/S full-cell with an ether- and lithium triflate-based electrolyte for high ionic conductivity. The result is a highly cyclable full-cell with an areal capacity of 2.3 mAh/cm(2), a cyclability surpassing 450 cycles and capacity retention of 80% after 150 cycles (capacity loss <0.4% per cycle). A detailed physical and electrochemical investigation of the SiNW Li/S full-cell including in-operando synchrotron X-ray diffraction measurements reveals that the lower degradation is due to a lower self-reduction of polysulfides after continuous charging/discharging.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:30116 |
| Date | 25 January 2017 |
| Creators | Krause, Andreas, Dörfler, Susanne, Piwko, Markus, Wisser, Florian M., Jaumann, Tony, Ahrens, Eike, Giebeler, Lars, Althues, Holger, Schädlich, Stefan, Grothe, Julia, Jeffery, Andrea, Grube, Matthias, Brückner, Jan, Martin, Jan, Eckert, Jürgen, Kaskel, Stefan, Mikolajick, Thomas, Weber, Walter M. |
| Publisher | Nature Publishing Group |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 2045-2322 |
Page generated in 0.0016 seconds