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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (10): 948-954. 上一篇    下一篇

研究论文

隔膜对BMImBF4离子液体电解液中镁沉积-溶出性能的影响

努丽燕娜, 杨军, 高鹏飞, 李云, 王久林   

  1. (上海交通大学化学化工学院 上海 200240)
  • 投稿日期:2009-08-24 修回日期:2009-12-30 发布日期:2010-01-25
  • 通讯作者: 努丽燕娜 E-mail:nlyn@sjtu.edu.cn

Effect of Separators on BMImBF4 Ionic Liquid as the Electrolyte of Magnesium Deposition-Dissolution

NU Li-Yan-Na, YANG Jun, GAO Feng-Fei, LI Yun, WANG Jiu-Lin   

  1. (School of Chemistry and Chemical Technology, Shanghai Jiaotong University, Shanghai 200240)
  • Received:2009-08-24 Revised:2009-12-30 Published:2010-01-25
  • Contact: NuLi Yanna E-mail:nlyn@sjtu.edu.cn

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研究了实验扣式电池中Celgard 2400, Celgard 2500, ENTEK ET 20-60, TEKLON UH2054以及一种玻璃纤维隔膜对含有0.5 mol•L－1 Mg(CF3SO3)2的BMImBF4离子液体电解液中镁的电化学沉积-溶出性能的影响. 通过扫描电镜对五种隔膜的表面形貌进行了分析, 吸液实验比较了不同隔膜对Mg(CF3SO3)2/BMImBF4离子液体电解液的吸液性能, 交流阻抗技术测定了隔膜的电导率, 恒电流充放电测试研究了扣式电池中镁的沉积-溶出性能. 在这五种隔膜中, 虽然玻璃纤维隔膜的机械强度较差, 但该材料对Mg(CF3SO3)2/BMImBF4离子液体电解液有较好的吸液性和液体保持性, 特别是具有高的离子电导率, 有利于大电流下镁的沉积-溶出.

关键词: 离子液体, BMImBF4, 隔膜, 电化学沉积-溶出, 镁电池

The effect of Celgard 2400, Celgard 2500, ENTEK ET20-60, TEKLON UH2054 and glass fiber separator on BMImBF4 ionic liquid containing 0.5 mol•L－1 Mg(CF3SO3)2 as the electrolyte of magnesium deposition-dissolution was studied. Scanning electron microscopy, absorption performance, AC impedance and constant current charge-discharge measurements were conducted to analyze the surface structure of separators, absorption and maintenance of electrolyte, ionic conductivity and magnesium deposition- dissolution process in coin cells, respectively. The results indicated that the glass fiber separator was more suitable for magnesium deposition-dissolution in Mg(CF3SO3)2/BMImBF4 electrolyte, especially at high current densities due to better absorption and maintenance performances, and higher ionic conductivity.

Key words: ionic liquids, BMImBF4, separators, electrochemical deposition and dissolution, magnesium batteries

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