It is of great interest since in theory the Mg/S chemistry can provide 1722 Wh/kg energy density with a voltage at ~1.7 V. Magnesium is abundant, non-toxic and doesn't degrade in air.
A first review on Mg–S batteries has been published in MRS Communications[1] In 2011, Toyota Motor announced a research project in this area,[2] and in the same year they reported a new electrolyte that is chemically compatible with sulfur.
[9][10] In 2015, a Mg rechargeable battery was presented built with a graphene–sulfur nanocomposite cathode, a Mg–carbon composite anode and a non-nucleophilic Mg-based complex in tetraglyme solvent as the electrolyte.
The graphene–sulfur composite cathode, with a high surface area, porous morphology and oxygen functional groups, along with a non-nucleophilic Mg electrolyte, gives improved performance.
[12] It is based on a weakly coordinated Mg salt with big anions (fluorinated alkoxyborate) which can be prepared by a simple reaction and used in-situ.