A free-standing reduced graphene oxide aerogel as supporting electrode in a fluorine-free Li2S8 catholyte Li-S battery
Journal article, 2019

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.

Li-S batteries

Reduced graphene oxide

Fluorine-free electrolyte for Li-S batteries

Energy storage

Polysulphide based catholyte electrodes

Author

Carmen Cavallo

Chalmers, Physics, Condensed Matter Physics

Marco Agostini

Chalmers, Physics, Condensed Matter Physics

James P. Genders

University of Southampton

Muhammad Abdelhamid

Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Aleksandar Matic

Chalmers, Physics, Condensed Matter Physics

Journal of Power Sources

0378-7753 (ISSN)

Vol. 416 111-117

Subject Categories

Inorganic Chemistry

Materials Chemistry

Other Chemical Engineering

Areas of Advance

Energy

Materials Science

Infrastructure

Chalmers Materials Analysis Laboratory

DOI

10.1016/j.jpowsour.2019.01.081

More information

Latest update

2/20/2019