Magnesium hexakis(methanol)-dinitrate complex electrolyte for use in rechargeable magnesium batteries
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Functional compatible electrolyte with Mg2+ intercalation cathodes represents one of the largest obstacles in the development of practical Mg batteries MBs. In current work, we report for the first time magnesium hexakis(methanol)-dinitrate complex (MHMD) electrolyte product reaction of 2,2-dimethoxypropane with magnesium nitrate hexahydrate via ‘Solvent-in-Salt’ method. 2,2-Dimethoxypropane as a water scavenger can capture reducible molecules like H2O and dehydrate Mg(NO3)2.6H2O to form magnesium hexakis(methanol)-dinitrate complex. Meanwhile, Mg cloud bonds will become weak—something which frees up the mobility of Mg2+. This electrolyte exhibits high ionic conductivity with low activation energy ~ 0.18 eV. The general aim of the investigation was to demonstrate a potential application of MHMD electrolyte in Mg-ion cell. Mg cells were analyzed with the use of cyclic voltammetry (CV), galvanostatic charging/discharging tests, and electrochemical impedance spectroscopy. A comparative study between different cathodes like V2O5, GeO2, TiO2, and S using MHMD electrolyte was performed. The S cathode has an initial discharge capacity of 370 mAh g−1 and retained a reversible capacity at 60 mAh g−1 after 20 cycles exhibiting better electrochemical performances than those of V2O5, GeO2, and TiO2 cathodes. This work opens up a new pathway to explore new electrolytic materials for MBs with high performance.
KeywordsEnergy storage Magnesium battery Electrolyte Cathode
This work is partial financially supported by the Support Development of Scientific Research Centre of Benha University (SDSRC) (Grant No. 1076) and Science Technology Development Fund (Grant No. 12564).
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