Issue 3, 2022

Sustainable and cost-effective ternary electrolyte Et3NHCl–AlCl3–Mg(DEP)2 for high-performance rechargeable magnesium batteries

Abstract

Cost-effective and sustainable battery materials for large-scale batteries are the need of the hour to garner renewable energy with high-performance metal battery technologies. Here, we report the high-performance and long cycle life electrolyte prepared from low-cost triethylamine hydrochloride (Et3NHCl) and aluminum chloride (AlCl3) termed as (TA) with different concentrations of magnesium diethylphosphate (Mg(DEP)2) salt. The optimized ratio of the 0.1 M Mg(DEP)2 electrolyte has shown a high ionic conductivity of 4.5 × 10−3 S cm−1 at ambient temperature and good anodic stability of 2.41 V vs. Mg/Mg2+. The dissolution/deposition of magnesium (Mg) on a Pt working electrode was systematically analyzed in this electrolyte. Cyclic voltammetry (CV) of the Mg–graphite battery was used to probe the intercalation/de-intercalation of Mg–AlCl4 ions into/from the graphite layer structure. This was confirmed by various analytical techniques, such as energy dispersive X-ray spectroscopy, X-ray diffraction technique and X-ray photoemission spectroscopy. Notably, during the galvanostatic study analysis, the assembled Mg cell delivered a high discharge capacity of 115 mA h g−1 at a high C/10 rate, with more than 180 cycles at >80% coulombic efficiency. This electrolyte will be helpful in grid-scale power storage systems in future generations.

Graphical abstract: Sustainable and cost-effective ternary electrolyte Et3NHCl–AlCl3–Mg(DEP)2 for high-performance rechargeable magnesium batteries

Supplementary files

Article information

Article type
Paper
Submitted
20 Oct 2021
Accepted
20 Dec 2021
First published
21 Dec 2021

Phys. Chem. Chem. Phys., 2022,24, 1840-1848

Sustainable and cost-effective ternary electrolyte Et3NHCl–AlCl3–Mg(DEP)2 for high-performance rechargeable magnesium batteries

S. Prabhakar, S. N. Chavan, P. Basak and V. R. Jetti, Phys. Chem. Chem. Phys., 2022, 24, 1840 DOI: 10.1039/D1CP04794A

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