Graphene oxide-carbon nanotubes aerogels with high sulfur loadings suitable as binder-free cathodes for high performance lithium-sulfur batteries

JOURNAL OF POWER SOURCES

卷:412

Article

Luis Gomez-Urbano, Juan¹  Luis Gomez-Camer, Juan¹  Botas, Cristina¹  Rojo, Teofilo^1,2  Carriazo, Daniel^1,3 

[1] CIC EnergiGUNE, Parque Tecnol Alava, Minano 01510, Alava, Spain

[2] Univ Pais Vasco UPV EHU, Dept Quim Inorgan, Bilbao 48080, Spain

[3] Basque Fdn Sci, IKERBASQUE, Bilbao 48013, Spain

关键词: Energy storage;    Graphene;    Binder-free electrodes;    Carbon;    Nanotubes;    High capacity;   

DOI  :  10.1016/j.jpowsour.2018.11.077

来源: Elsevier

【 摘 要 】

Herein we report a simple approach for the preparation of graphene oxide-carbon nanotube-sulfur composites. The self-standing composites can be easily prepared by freeze drying a frozen graphene oxide-carbon nanotube suspension, and then impregnated with sulfur by melt diffusion. Composites obtained in this way are physicochemically characterized by elemental analysis, X-ray diffractometry (XRD), electron microscopy and gas adsorption, showing a three dimensional macroporous graphene-based architecture in which sulfur is homogeneously distributed. The performance of self-standing composites with sulfur loadings over 4.0 mg cm(-2) is evaluated as binder-free positive electrodes for Lithium-Sulfur (Li-S) batteries. Results show that the incorporation of just 2 wt.% of CNTs significantly improves both the specific capacity and capacity retention compared to the results shown by the CNT-free samples, and slightly improves the performance of thermally reduced samples. More importantly, reversible specific capacity values over 500 mAh g(-1) at a rate of 0.1C after 100 charge/discharge cycles are obtained for either thermally reduced and CNT containing samples, which in terms of areal capacity correspond to values over 2.0 mAh cm(-2).

【 授权许可】

Free