Abstract
Three kinds of ethylenethiourea-Grignard reagent/THF electrolytes were prepared by reacting ethylenethiourea with different Grignard reagents such as EtMgBr/THF, PhMgBr/THF and PhMgCl/THF. Cyclic voltammetry tests on Pt disk electrode show that the electrolytes have good performance of magnesium deposition-dissolution as Grignard reagents and higher anodic stabilities than Grignard reagents. The oxidative decomposition potential of ethylenethiourea-PhMgBr/THF on Pt electrode can reach 2.3 V (vs. Mg/Mg2+). The conductivity of ethylenethiourea-PhMgBr/THF electrolyte initially increases and then decreases with the increase of the concentration and reaches to the highest value of 615 μS·cm-1 at 0.9 mol·L-1. The comparison in cyclic voltammograms of 0.9 mol·L-1 ethlenethiourea-PhMgBr/THF electrolyte on Pt, Ni, Cu and Al electrodes demonstrates that the oxidative decomposition potential on Ni electrode is the highest (2.4 V (vs. Mg/Mg2+)). Constant-current discharge and charge tests of coin cells further show that the magnesium deposition-dissolution potential on Ni substrate is low and the stable cycle efficiency can reach 92%. For ethlenethiourea-PhMgBr/THF electrolyte, nickel is suitable to be used as a practical current collector.
Graphical Abstract
Keywords
ethylenethiourea, Grignard reagent, electrolytes, rechargeable magnesium batteries
Publication Date
2014-02-25
Online Available Date
2014-02-24
Revised Date
2013-01-21
Received Date
2012-09-30
Recommended Citation
Pei-wen BIAN, Yan-na NULI, Qiang CHEN, Jun YANG, Jiu-lin WANG.
Magnesium Deposition-Dissolution Performance of Ethylenethiourea-Grignard Reagent/THF Electrolytes[J]. Journal of Electrochemistry,
2014
,
20(1): 73-79.
DOI: 10.13208/j.electrochem.120930
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol20/iss1/13
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