of 6
Supplemental Materials for:
Effect of the
Electrolyte Solvent on Redox Processes in
Mg-S Batteries
Sarah C. Bevilacqua,
Kim H. Pham,
and Kimberly A. See
,
Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena,
California 91125, United States
Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
E-mail: ksee@caltech.edu
Figure S1: (a) SEM of the synthesized MgS. (b) Powder XRD of the as-prepared MgS
used in the MgS electrodes. The two phase Rietveld refinement is shown along with
the difference curve suggesting the material is mostly rock salt MgS with a 3.7% MgO
impurity.
S1
Figure S2: LSVs of Mg-C two-electrode cells with different current collectors. The elec-
trolyte was 1xMACC in THF and the potential was swept negative at 0.05 mV s
1
. The
least corrosion current was seen with a carbon coated Al current collector.
Figure S3: Custom cell designed to limit electrolyte contact with metal.
S2
Figure S4: LSVs of the MACC electrolyte in different solvents. The traces demonstrate
the anodic stability of the electrolyte on a Pt working electrode. The voltage was swept
positive at 5.0 mV s
1
.
Figure S5: CVs of conditioned 0.3 M MgCl
2
+ 0.15 M AlCl
3
(5xMACC) in DME, G4:DOL,
DME:DOL, and G4:THF. The CVs are measured in two-electrode cells with a Pt working
electrode and Mg counter/reference electrode at 5 mV s
1
.
S3