物理化学学报 >> 2007, Vol. 23 >> Issue (04): 554-558.doi: 10.3866/PKU.WHXB20070420

研究论文 上一篇    下一篇

高氯酸锂与1,3-氮氧杂环-戊-2-酮形成的二元熔盐电解质

陈人杰; 吴锋; 李丽; 邱新平; 陈实   

  1. 清华大学化学系, 北京 100084; 北京理工大学化工与环境学院, 北京 100081; 国家高技术绿色材料发展中心, 北京100081
  • 收稿日期:2006-12-07 修回日期:2006-12-25 发布日期:2007-04-05
  • 通讯作者: 吴锋 E-mail:wufeng863@vip.sina.com

Binary Molten Salt Electrolytes Based on LiClO4 and 2-oxazolidinone

CHEN Ren-Jie; WU Feng; LI Li; QIU Xin-Ping; CHEN Shi   

  1. Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China; School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, P. R. China; National Development Center of High Technology Green Materials, Beijing 100081, P. R. China
  • Received:2006-12-07 Revised:2006-12-25 Published:2007-04-05
  • Contact: WU Feng E-mail:wufeng863@vip.sina.com

摘要: 制备了高氯酸锂(LiClO4)与1,3-氮氧杂环-戊-2-酮(OZO)形成的二元熔盐电解质, 虽然先导物具有较高的熔点, 但二者可形成均一、稳定的共熔体系, 测试结果表明该熔盐体系具有低的共熔温度(-50 益). 红外光谱分析表明OZO 通过Li—O 键与LiClO4中Li+配位而破坏了LiClO4的离子键,形成很大的配位阳离子,削弱了阴阳离子间的库伦作用力; 同时Li—O 配位也导致OZO 分子间的氢键断裂, 因而体系的共熔温度较之纯物质熔点显著降低, 部分样品室温下以液体状态稳定存在. 采用交流阻抗法和循环伏安法对其电化学性质进行研究, 结果显示, 配比n(LiClO4):n(OZO)=1:4.5 的样品室温(25 ℃)电导率为0.66×10^-3 S·cm^-1, 80 ℃电导率为7.33×10^-3 S·cm^-1; 其电化学稳定电位窗口约为3.5 V.

关键词: 熔盐电解质, 热学性质, 红外光谱, 离子电导率, 1,3-氮氧杂环-戊-2-酮, 高氯酸锂

Abstract: Novel binary molten salt electrolytes based on LiClO4 and 2-oxazolidinone (OZO) were prepared. The electrolytes appeared as liquid at room temperature though they were composed of two solids. DSC analysis showed that the LiClO4-OZO electrolyte was liquid with a eutectic temperature about -50 ℃. FTIR spectroscopy indicated that OZO could coordinate with Li+ cation in the LiClO4-OZO system through Li—O bonding. A big coordinate cation was formed and the coulombic force was weakened. Meanwhile, Li—O coordination could also lead to the breakage of hydrogen bonding between OZO molecules, resulting in the decrease of the eutectic temperature of the system compared with pure salt. Some the molten salt samples existed as liquid state at roomtemperature. The electrochemical properties were evaluated by ac impedance spectroscopy and cyclic voltammertry, respectively. The conductivity of LiClO4-OZO electrolyte at molar ratio of 1:4.5 was 0.66×10^-3 S·cm-1 at 25 ℃and 7.33×10^-3 S·cm-1 at 80 ℃, and the electrochemical windowwas about 3.5 V.

Key words: Molten salt electrolyte, Thermal property, FTIR spectroscopy, Ionic conductivity, 2-Oxazolidinone, Lithiumperchlorate

MSC2000: 

  • O646