A free-standing reduced graphene oxide aerogel as supporting electrode in a fluorine-free Li2S8 catholyte Li-S battery

Cavallo, Carmen,1986Chalmers tekniska högskola,Chalmers University of Technology (författare)

We report on a novel, simple, and environmentally benign synthesis route for a free-standing reduced graphene oxide (r-GO) aerogel and its application as supporting electrode for the electrochemical redox reaction of sulphur in a catholyte-based lithium-sulphur battery. A mesoporous matrix is formed by a layers of r-GO, providing sites for electrochemical reactions and a highly conducting pathway for electrons. The highly porous structure is easily infiltrated by a catholyte solution providing a homogeneous distribution of the sulphur active material in the conductive graphene matrix and ensuring efficient electrochemical reactions. This is demonstrated by a high capacity, 3.4 mAh cm−2, at high mass loading, 3.2 mg cm−2 of sulphur in the cathode and in total the sulphur loading in the Li-S cell is even double (6.4 mg cm−2). Additionally, the presence of oxygen groups in the r-GO aerogel structure stabilizes the cycling performance and the Li-S cell with the fluorine free catholyte shows a capacity retention of 85% after 350 cycles.

Agostini, Marco,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)agostini (författare)
Genders, James P.University of Southampton (författare)
Abdelhamid, Muhammad,1987Commonwealth Scientific and Industrial Research Organisation (CSIRO)(Swepub:cth)muhabd (författare)
Matic, Aleksandar,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matic (författare)
Chalmers tekniska högskolaUniversity of Southampton (creator_code:org_t)

Av författaren/redakt...: Cavallo, Carmen, ...; Agostini, Marco, ...; Genders, James P ...; Abdelhamid, Muha ...; Matic, Aleksanda ...

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