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Lithium-sulphur batteries - binder free carbon nanotubes electrode examined with various electrolytes

: Hagen, M.; Dörfler, S.; Althues, H.; Tübke, J.; Hoffmann, M.J.; Kaskel, S.; Pinkwart, K.


Journal of power sources 213 (2012), S.239-248
ISSN: 0378-7753
ISSN: 1873-2755
Fraunhofer IWS ()
Fraunhofer ICT ()
battery; binder free; CNT; ionic liquid; Lithium-sulphur; solid electrolyte

A new type of electrode for lithium-sulphur batteries is introduced based on vertical-aligned carbon nanotubes (CNTs) grown on a nickel foil without any binder. The electrodes are synthesized by employing a catalyst layer and a CVD process. The CNTs directly synthesized on the Ni current collector are sulphur infiltrated using different approaches and the results are examined by SEM. Furthermore, cycle tests (1.0-3.0 V) with various electrolytes (liquid organic, ionic liquid and solid) are performed.The binder free CNT cathodes contain the highest so far published total ratio of sulphur (90%) in the electrode. Additionally the sulphur mass per cm⊃ electrode can be more than three times as high as in regular slurry-based sulphur electrodes, thus doubling the volumetric energy density.