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首页> 外文期刊>RSC Advances >Study of decomposition products by gas chromatography-mass spectrometry and ion chromatography-electrospray ionization-mass spectrometry in thermally decomposed lithium hexafluorophosphate-based lithium ion battery electrolytes
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Study of decomposition products by gas chromatography-mass spectrometry and ion chromatography-electrospray ionization-mass spectrometry in thermally decomposed lithium hexafluorophosphate-based lithium ion battery electrolytes

机译：通过气相色谱 - 质谱和离子色谱 - 电喷雾电离质谱法的分解产物研究了热分解六氟磷酸锂基锂离子电池电解质的离子光谱法

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摘要

In this work, the thermal decomposition of a lithium ion battery electrolyte (1 M LiPF6 in ethylene carbonate/ethyl methyl carbonate, 50/50 wt%) with a focus on the formation of organophosphates was systematically studied. The quantification of non-ionic dimethyl fluorophosphate and diethyl fluorophosphate was performed with synthesized standards by gas chromatography-mass spectrometry. Due to absence of commercially available or synthesized standards for the monitoring of ionic methyl fluorophosphate, ethyl fluorophosphate and ethylene phosphate a method working with ion chromatography-electrospray ionization-mass spectrometry was developed, where dibutyl phosphate was used as an internal standard. In addition, an ion chromatography conductivity detection method with short analysis time for simultaneous determination and quantification of F-, PF6- and BF4- was developed. The formation and degradation of analytes was studied to show the dependence of different temperatures, electrolyte volumes and separator materials. The thermal aging experiments were carried out in gas-tight aluminum vials at 80 degrees C for three weeks. After the storage time, the samples were diluted with the appropriate analysis solvents and investigated with gas chromatography-mass spectrometry, ion chromatography and ion chromatography-electrospray ionization-mass spectrometry. Finally, the thermal degradation of the electrolyte at 85 degrees C after five days in aluminum and glass vials was studied.
机译：在这项工作中，一个锂离子电池电解质的热分解（1的1M LiPF 6在碳酸亚乙酯/碳酸甲乙酯，50/50重量％），重点是有机磷酸酯的形成进行了系统研究。通过气相色谱 - 质谱法用合成的标准进行非离子二甲基荧光磷酸磷酸磷酸酯和氟磷酸二乙酯的定量。由于没有商业上可获得的或合成的用于监测离子甲基荧光磷酸，氟磷酸乙酯和乙烯磷酸乙酯的方法开发了与离子色谱 - 电喷雾电离质谱法一起使用的方法，其中二丁基磷酸酯用作内标。另外，开发了具有短分析时间的离子色谱导电性检测方法，用于同时测定和定量F-，PF6和BF4-的定量。研究了分析物的形成和降解，以显示不同温度，电解质体积和分离材料的依赖性。热老化实验在80℃下在80℃下在气密铝瓶中进行三周。储存时间后，用适当的分析溶剂稀释样品，并用气相色谱 - 质谱，离子色谱和离子色谱 - 电喷雾电离质谱法进行稀释。最后，研究了在铝和玻璃瓶中五天后85℃的电解质在85℃下的热降解。

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  • 来源
    《RSC Advances》 |2015年第98期|共8页
  • 作者

    Kraft Vadim; Weber Waldemar; Gruetzke Martin; Winter Martin; Nowak Sascha;

  • 作者单位

    Univ Munster Inst Phys Chem MEET Battery Res Ctr D-48149 Munster Germany;

    Univ Munster Inst Phys Chem MEET Battery Res Ctr D-48149 Munster Germany;

    Univ Munster Inst Phys Chem MEET Battery Res Ctr D-48149 Munster Germany;

    Univ Munster Inst Phys Chem MEET Battery Res Ctr D-48149 Munster Germany;

    Univ Munster Inst Phys Chem MEET Battery Res Ctr D-48149 Munster Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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