Magnesium Deposition-Dissolution Performance of Ethylenethiourea-Grignard Reagent/THF Electrolytes

Authors

Pei-wen BIAN, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
Yan-na NULI, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Follow
Qiang CHEN, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
Jun YANG, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
Jiu-lin WANG, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

Corresponding Author

Yan-na NULI(nlyn@sjtu.edu.cn)

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

DOI Link

https://doi.org/10.13208/j.electrochem.120930

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