乙烯硫脲-格氏试剂/THF电解液镁沉积-溶出性能

doi:10.13208/j.electrochem.120930

摘要/Abstract

摘要： 将乙烯硫脲与不同格氏试剂EtMgBr/THF、PhMgBr/THF、PhMgCl/THF反应制得了3种乙烯硫脲-格氏试剂/THF电解液. 通过循环伏安测试了在Pt电极的镁沉积-溶出性能. 结果表明，形成乙烯硫脲-格氏试剂/THF电解液不改变电解液的镁沉积-溶出性能，却拓宽了其电化学窗口. 如乙烯硫脲-PhMgBr/THF溶液的氧化分解电位可达2.3 V（vs. Mg/Mg²⁺）, 该电解液的电导率随溶液溶度增大先升后降，0.9 mol·L^-1时其电导率最高，可达615 μS·cm^-1. 比较乙烯硫脲-PhMgBr/THF在Pt、Ni、Cu和Al四种金属电极的电化学性能，发现在Ni电极的氧化分解电位最高，可达2.4 V（vs. Mg/Mg²⁺），且具有良好的镁沉积-溶出性能. CR2016扣式电池的循环测试表明，Ni基底上的镁沉积-溶出电位较低，其循环效率可达到92%，适宜作为实用电池的集流体.

关键词: 乙烯硫脲, 格氏试剂, 电解液, 可充镁电池

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.

Key words: ethylenethiourea, Grignard reagent, electrolytes, rechargeable magnesium batteries

中图分类号:

O646

卞沛文，努丽燕娜*，陈强，杨军，王久林. 乙烯硫脲-格氏试剂/THF电解液镁沉积-溶出性能[J]. 电化学（中英文）, 2014, 20(1): 73-79.

BIAN Pei-wen, NULI Yan-na*, CHEN Qiang, YANG Jun, WANG Jiu-lin. Magnesium Deposition-Dissolution Performance of Ethylenethiourea-Grignard Reagent/THF Electrolytes[J]. Journal of Electrochemistry, 2014, 20(1): 73-79.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.120930

https://electrochem.xmu.edu.cn/CN/Y2014/V20/I1/73

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