储能科学与技术 ›› 2022, Vol. 11 ›› Issue (10): 3100-3111.doi: 10.19799/j.cnki.2095-4239.2022.0211

• 储能材料与器件 • 上一篇    下一篇

脂肪族冠醚在电池电解液中的应用

方黎锋()   

  1. 浙江肯特催化材料科技有限公司, 杭州 311200, 浙江, China
  • 收稿日期:2022-04-19 修回日期:2022-05-07 出版日期:2022-10-05 发布日期:2022-10-10
  • 作者简介:方黎锋(1987—)男,本科,工程师,从事阳离子聚合、特种表面活性剂等研究,E-mail:sandyflf@163.com

Application of aliphatic-crown ethers in battery electrolytes

Lifeng FANG()   

  1. Zhejiang Kente Catalysts Technologies Co. , Ltd, Hangzhou 311200, Zhejiang, China
  • Received:2022-04-19 Revised:2022-05-07 Online:2022-10-05 Published:2022-10-10

摘要:

电池中各材料之间的相容性是影响其性能的重要因素之一,在电解液中添加12-冠醚-4、15-冠醚-5、18-冠醚-6等脂肪族冠醚可以通过改善相容性来提升电池性能。本文介绍了冠醚的分子结构及其对应的表界面活性和配位包结能力;综述了历年来脂肪族冠醚在锂电池电解液中的应用研究情况,将其作为电解液添加剂的效果归纳为抑制金属的不规则析出、在电极表面成膜、减少溶剂副反应、增溶电解质、提高离子传导率、提升固态电解质性能等;列举了国内相关发明专利的发表情况;分析了限制脂肪族冠醚在电解液中广泛应用的主要原因是当前主流威廉姆森醚合成工艺的选择性低、副产物多、纯化困难,导致生产成本高昂,而更为理想的环氧乙烷低聚合成工艺,尚需改进以避免使用含氟盐;最后,对脂肪族冠醚在电解液中的应用前景进行了展望。

关键词: 电解液, 相容性, 脂肪族冠醚, 12冠醚-4, 15-冠醚-5, 18-冠醚-6

Abstract:

The compatibility between battery materials affects their performance. The performance of batteries can be improved by adding 12-crown-4, 15-crown-5, 18-crown-6, and other aliphatic-crown ethers to the electrolyte, which improves the compatibility. This article introduced the molecular structure of crown ethers, which determines their surface-interface activities and coordination inclusion capabilities. In addition, it reviews the application history of aliphatic crown ethers in lithium-ion battery electrolytes, summarizes the effects of crown ether on the inhibition of the irregular precipitation of metals, forming films on the electrode surface, reducing solvent side reactions, solubilizing electrolytes, improving ionic conductivity, improving the performance of solid electrolytes, etc. The application of aliphatic crown ethers in electrolytes is limited by the high production costs of the Williamson ether-synthesis process, which has low selectivity, many by-products, and difficult purification. Oligomerization using ethylene oxide is a preferable process for producing aliphatic crown ethers; however, it needs to be improved to avoid the use of fluorine-containing salts. Finally, there are prospects for the application of aliphatic-crown ethers in electrolytes.

Key words: electrolyte, compatibility, aliphatic crown ethers, 12-crown-4, 15-crown-5, 18-crown-6

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