高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (11): 2529-2533.doi: 10.7503/cjcu20180316

• 物理化学 • 上一篇    下一篇

离子型添加剂四丁基胺-双(氟磺酰)亚胺对锂电池性能的影响

王凤春(), 周万里   

  1. 通化师范学院化学学院, 通化 134002
  • 收稿日期:2018-04-23 出版日期:2018-11-10 发布日期:2018-09-22
  • 作者简介:联系人简介: 王凤春, 女, 副教授, 主要从事无机/高分子材料化学研究. E-mail: wangfc0608@163.com
  • 基金资助:
    吉林省科技发展计划项目(批准号: JJKH20170434KJ)资助.

Influences of Ionic Additive Tetrabutylammonium-bis(fluorosulfonyl)imide on Performance of Lithium Metal Batteries

WANG Fengchun*(), ZHOU Wanli   

  1. Department of Chemistry, Tonghua Normal University, Tonghua 134002, China
  • Received:2018-04-23 Online:2018-11-10 Published:2018-09-22
  • Contact: WANG Fengchun E-mail:wangfc0608@163.com
  • Supported by:
    † Supported by the Jilin Science and Technology Development Plan Project, China(No.JJKH20170434KJ).

摘要:

将离子型添加剂四丁基胺-双(氟磺酰)亚胺(TBA-FSI)应用于Li|Cu和Li|FePO4二次锂电池, 测试了含有TBA-FSI添加剂的1 mol/L LiTFSI 1,3-二氧戊烷/乙二醇二甲醚(DOL/DME, 体积比1:1)电解液与金属负极的界面匹配性. 研究发现, 与1 mol/L LiTFSI DOL/DME相比, 含有TBA-FSI添加剂的锂电池表现出更小的极化电压、 稳定的界面阻抗和较长的循环寿命. 这主要归功于TBA-FSI在金属锂表面还原生成富含LiF和Li3N等无机物的稳定固态电解质界面(SEI)膜.

关键词: 锂电池, 金属锂负极, 锂枝晶, 添加剂, 四丁基胺-双(氟磺酰)亚胺

Abstract:

An ionic compound, tetrabutylammonium-bis(fluorosulfonyl)imide(TBA-FSI) was employed as an additive to lithium metal batteries. The 1 mol/L lithium bis(trifluoromethanesulfonyl)imide(LiTFSI)-based 1,3-dioxolane(DOL)/dimethoxyethane(DME) electrolyte showed high compatibility toward lithium metal anode when 5%(mass fraction) TBA-FSI was added owing to the formation of a LiF-, Li3N- riched solid electrolyte interpase(SEI) film on lithium metal anode. As a result, the lithium dendrite growth was significantly restricted and coulombic efficiency of Li|Cu cells was markedly enhanced.

Key words: Lithium metal battery, Lithium metal anode, Lithium dendrite, Additive, Tetrabutylammonium-bis(fluorosulfonyl)imide(TBA-FSI)

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