无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2024, Vol. 56 ›› Issue (2): 74-79.doi: 10.19964/j.issn.1006-4990.2023-0144

• 研究与开发 • 上一篇    下一篇

高纯4,5-二氰基-2-三氟甲基咪唑锂的制备与性能研究

杨水艳(), 杨明霞, 辛婉婉   

  1. 多氟多新材料股份有限公司,河南 焦作 454191
  • 收稿日期:2023-03-15 出版日期:2024-02-10 发布日期:2024-02-06
  • 作者简介:杨水艳(1980— ),女,工程师,研究方向为有机化工及锂离子电池材料;E-mail:dfdysy@126.com

Study on preparation and properties of high⁃purity lithium 2-trifluoromethyl-4,5-dicyanoimidazole

YANG Shuiyan(), YANG Mingxia, XIN Wanwan   

  1. Do -Fluoride New Materials Co. ,Ltd. ,Jiaozuo 454191,China
  • Received:2023-03-15 Published:2024-02-10 Online:2024-02-06

摘要:

以4,5-二氰基-2-三氟甲基咪唑(TDI)和无水氯化锂为原料,制备高纯4,5-二氰基-2-三氟甲基咪唑锂(LiTDI)。考察了原料物质的量比、反应温度和反应时间对粗品收率的影响,以及重结晶溶剂、溶剂用量、降温速率、重结晶时间对产品纯度和收率的影响。实验结果表明:在m(DMC)/m(TDI)=2、n(LiCl)/n(TDI)=1、反应温度为45 ℃、反应时间为5 h条件下,反应液经过滤-浓缩-降温结晶后,粗品收率可达78%;在重结晶溶剂为乙二醇二甲醚、m(乙二醇二甲醚)/m(LiTDI粗品)=2、降温速率为3 ℃/h、结晶时间为10 h条件下,制得的LiTDI纯度≥99.95%、收率可达88%。此外,LiTDI作为锂离子电池添加剂,可以显著提升锂电池的常温和高温循环性能。

关键词: 4,5-二氰基-2-三氟甲基咪唑锂, 4,5-二氰基-2-三氟甲基咪唑, 氯化锂, 锂电池

Abstract:

Lithium 2-trifluoromethyl-4,5-dicyanoimidazole(LiTDI) with high purity was synthesized by the raw materials of 2-trifluoromethyl-4,5-dicyanoimidazole(TDI) and lithium chloride.The effects of volume ratio of reactants,reaction temperature,reaction time on the crude product yield were investigated,and the effects of recrystallization solvent,amount of solvent,cooling rate,recrystallization time on the product purity and yield were studied.The experimental results showed that after filtration⁃concentration⁃cooling crystallization of the reaction liquid,the crude product yield was 78% at m(DMC)/m(TDI)=2,n(LiCl)/n(TDI)=1,reaction temperature of 45 ℃,reaction time of 5 h,and the product purity was greater than or equal to 99.95% and the yield was 88%,when the recrystallization solvent was dimethoxyethane,m(dimethoxyethane)/m(crude LiTDI)=2,the cooling rate was 3 ℃/h,the recrystallization time was 10 h.In addition,adding LiTDI in electrolyte could significantly improve the performance of battery at room temperature and high temperature.

Key words: LiTDI, TDI, lithium chloride, lithium battery

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