title: Performance study of magnesium-sulfur battery using a graphene based sulfur composite cathode electrode and a non-nucleophilic Mg electrolyte.
abstract: Here we report for the first time the development of a Mg rechargeable battery using a graphene-sulfur nanocomposite as the cathode, a Mg-carbon composite as the anode and a non-nucleophilic Mg based complex in tetraglyme solvent as the electrolyte. The graphene-sulfur nanocomposites are prepared through a new pathway by the combination of thermal and chemical precipitation methods. The Mg/S cell delivers a higher reversible capacity (448 mA h g(-1)), a longer cyclability (236 mA h g(-1) at the end of the 50(th) cycle) and a better rate capability than previously described cells. The dissolution of Mg polysulfides to the anode side was studied by X-ray photoelectron spectroscopy. The use of a graphene-sulfur composite cathode electrode, with the properties of a high surface area, a porous morphology, a very good electronic conductivity and the presence of oxygen functional groups, along with a non-nucleophilic Mg electrolyte gives an improved battery performance.
authors.affiliation: Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU), Helmholtzstr. 11, D-89081 Ulm, Germany. vinayan.parambath@kit.edu maximilian.fichtner@kit.edu.
authors.forename: B P
authors.initials: BP
authors.lastname: Vinayan
authors.forename: Zhirong
authors.initials: Z
authors.lastname: Zhao-Karger
authors.forename: Thomas
authors.initials: T
authors.lastname: Diemant
authors.forename: Venkata Sai Kiran
authors.initials: VS
authors.lastname: Chakravadhanula
authors.forename: Nele I
authors.initials: NI
authors.lastname: Schwarzburger
authors.forename: Musa Ali
authors.initials: MA
authors.lastname: Cambaz
authors.forename: R Jürgen
authors.initials: RJ
authors.lastname: Behm
authors.forename: Christian
authors.initials: C
authors.lastname: Kübel
authors.forename: Maximilian
authors.initials: M
authors.lastname: Fichtner