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Route to sustainable lithium-sulfur batteries with high practical capacity through a fluorine free polysulfide catholyte and self-standing Carbon Nanofiber membranes

Du Hyun Lim (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; Marco Agostini (Institutionen för fysik, Kondenserade materiens fysik (Chalmers)) ; Florian Nitze (Institutionen för fysik (Chalmers)) ; James Manuel ; Jou-Hyeon Ahn ; Aleksandar Matic (Institutionen för fysik, Kondenserade materiens fysik (Chalmers))
SCIENTIFIC REPORTS (2045-2322). Vol. 7 (2017), p. Article no. 6327 .
[Artikel, refereegranskad vetenskaplig]

We report on a new strategy to improve the capacity, reduce the manufacturing costs and increase the sustainability of Lithium-Sulfur (LiS) batteries. It is based on a semi-liquid cathode composed of a Li2S8 polysulphide catholyte and a binder-free carbon nanofiber membrane with tailored morphology. The polysulphides in the catholyte have the dual role of active material and providing Li+-conduction, i.e. no traditional Li-salt is used in this cell. The cell is able to deliver an areal capacity as high as 7 mAh cm(-2), twice than that of commercial Lithium-ion batteries (LiBs) and 2-4 times higher than that of state-of-the-art LiS cells. In addition, the battery concept has an improved sustainability from a material point of view by being mainly based on sulfur and carbon and being completely fluorine-free, no fluorinated salt or binders are used, and has potential for upscaling and competitive price. The combination of these properties makes the semi-liquid LiS cell here reported a very promising new concept for practical large-scale energy storage applications.

Nyckelord: cathode materials, energy-storage, performance, electrolytes, power, technology, electrodes, stability, cells



Denna post skapades 2017-08-24. Senast ändrad 2017-08-30.
CPL Pubid: 251384

 

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