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研究简报

乙烯硫脲-格氏试剂/THF电解液镁沉积-溶出性能

  • 卞沛文 ,
  • 努丽燕娜 ,
  • 陈强 ,
  • 杨军 ,
  • 王久林
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  • 上海交通大学化学化工学院,上海 200240

收稿日期: 2012-09-30

  修回日期: 2013-01-21

  网络出版日期: 2014-02-24

基金资助

国家自然科学基金项目(No. 21273147,No. 51035005)和上海市科委项目(No. 11JC1405700)资助

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

  • BIAN Pei-Wen ,
  • NU Li-Yan-Na ,
  • CHEN Qiang ,
  • YANG Jun ,
  • WANG Jiu-Lin
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  • School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received date: 2012-09-30

  Revised date: 2013-01-21

  Online published: 2014-02-24

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.

本文引用格式

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, 2014 , 20(1) : 73 -79 . DOI: 10.13208/j.electrochem.120930

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.
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