Probing the effect of the stoichiometric ratio of Mg(CF₃SO₃)₂/AlCl₃ on optimizing the electrolyte performance

Unexplored Class of Eutectic Electrolytes for Rechargeable Magnesium Batteries

“…Representative mid -FTIR spectra collected for (i) EMIC, (ii) Mg­(OTf) 2 , and (iii) EMIC-Mg­(OTf) 2 (1:0.14) eutectic in the frequency range of 1000–400 cm –1 are presented in Figure D. Mg­(OTf) 2 displays characteristic vibrational peaks at 639, 765, 1038, 1187, and 1398 cm –1 corresponding to the SO 3 asymmetric bending, symmetric CF 3 deformation, symmetric SO 3 stretch, asymmetric CF 3 stretch, and SO 3 stretch, respectively. , The eutectic EMIC-Mg­(OTf) 2 shows considerable peak shifts for SO 3 characteristic vibrations from 639 to 640 cm –1 , 1038 to 1032 cm –1 and 1398 to 1388 cm –1 . The vibrational modes related to EMIC too display considerable peak shifts assigned to C–H out-of-plane bending modes (1383–1388 cm –1 ) and C–H in-plane bending mode of vibrations (1092–1087 cm –1 ) along with the C–N stretching vibrations (753–755, and 622–640 cm –1 ).…”

The Metamorphosis of Mg(SO3CF3)2‐based Electrolytes for Rechargeable Magnesium Batteries

“…Yang et al obtained a clear electrolyte by dissolving 0.4 M Mg(OTf) 2 and 0.2 M InCl 3 in DME. As shown in Figure 15a-c, the optical and SEM images and corresponding X-ray diffract patterns suggest that InCl 3 can react with Mg to form an InÀ Mg layer on the top of the Mg surface (In/MgIn), by which a uniform Mg deposition can be obtained during plating due to the much lower adsorption energy of In (101), MgIn (001) and MgIn (101) than Mg (002), viz, À 1.36, À 1.56 and À 0.81 eV vs. À 0.75 eV (Figure 15d). As a result, the constructed magnesiophilic In/MgIn alloy enables a stable and low overpotential during Mg stripping/plating even at a high current density of 4 mA • cm À 2 (Figure 15e-h).…”

“…Through cyclic tests, it was found that the Mg(OTf) 2 /AlCl 3 ratio mainly affects the overpotential during Mg stripping/ plating. [101] Notably, Nguyen et al recognized that the biggest challenge for the development of Mg(OTf) 2 -based electrolyte lies in the low solubility of Mg(OTf) 2 in ethereal solvents, which are considered the only solvents with sufficient reductive stability that are compatible with Mg anode. Besides, a so-called conditioning process is necessary in the presence of Al- containing species, which limits the ease of practical application of the electrolyte.…”

“…Unlike most researchers, the authors used a mixed solvent containing acrylonitrile and G4 (2 : 1), and results revealed the optimal molar ratio of Mg(OTf) 2 /AlCl 3 was 0.17/0.28. Through cyclic tests, it was found that the Mg(OTf) 2 /AlCl 3 ratio mainly affects the overpotential during Mg stripping/plating [101] . Notably, Nguyen et al.…”