乙烯硫脲-格氏试剂/THF电解液镁沉积-溶出性能 |
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引用本文: | 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. |
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作者姓名: | 卞沛文 努丽燕娜 陈强 杨军 王久林 |
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作者单位: | 上海交通大学化学化工学院,上海 200240 |
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基金项目: | 国家自然科学基金项目(No.21273147,No.51035005);上海市科委项目(No.11JC1405700)资助 |
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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.
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关 键 词: | 乙烯硫脲 格氏试剂 电解液 可充镁电池 |
收稿时间: | 2012-09-30 |
Magnesium Deposition-Dissolution Performance of Ethylenethiourea-Grignard Reagent/THF Electrolytes |
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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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Keywords: | ethylenethiourea Grignard reagent electrolytes rechargeable magnesium batteries |
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