Ionic liquids as electrolyte additives for high-voltage lithium-ion batteries

ZHANG Wenlin; HUO Yu; LI Gongwei; SUN Tengfei; ZHAO Yongqi; LI Chunli

doi:10.11949/j.issn.0438-1157.20181175

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Ionic liquids as electrolyte additives for high-voltage lithium-ion batteries

Material science and engineering\, nanotechnology | 更新时间：2026-07-24

- Ionic liquids as electrolyte additives for high-voltage lithium-ion batteries
- CIESC Journal Vol. 70, Issue 6, Pages: 2334-2342(2019)
- 作者机构：
  
  河北工业大学化工学院，化工节能过程集成与资源利用国家地方联合工程实验室，天津 300130
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20181175
  CLC： TQ 152
- Received：10 October 2018，
  
  Revised：2019-03-21，
  
  Online First：15 June 2020，
  
  Published：05 June 2019
- 稿件说明：
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张文林, 霍宇, 李功伟, 孙腾飞, 赵勇琪, 李春利. 离子液体作为电解液添加剂用于高压锂离子电池[J]. 化工学报, 2019, 70(6): 2334-2342

ZHANG Wenlin, HUO Yu, LI Gongwei, SUN Tengfei, ZHAO Yongqi, LI Chunli. Ionic liquids as electrolyte additives for high-voltage lithium-ion batteries[J]. CIESC Journal, 2019, 70(6): 2334-2342
张文林, 霍宇, 李功伟, 孙腾飞, 赵勇琪, 李春利. 离子液体作为电解液添加剂用于高压锂离子电池[J]. 化工学报, 2019, 70(6): 2334-2342 DOI： 10.11949/j.issn.0438-1157.20181175.

ZHANG Wenlin, HUO Yu, LI Gongwei, SUN Tengfei, ZHAO Yongqi, LI Chunli. Ionic liquids as electrolyte additives for high-voltage lithium-ion batteries[J]. CIESC Journal, 2019, 70(6): 2334-2342 DOI： 10.11949/j.issn.0438-1157.20181175.

摘要

合成了功能化离子液体1-丁基-3-甲基咪唑双（三氟甲磺酰）亚胺盐（BMIMTFSI）作为高压锂离子电池电解液添加剂，用于抑制有机溶剂的氧化，以提高碳酸酯类电解液的耐高压性。分别采用充放电测试、电化学交流阻抗（EIS）、循环伏安法（CV）和扫描电子显微镜（SEM）等研究了LiNi

0.5

1.5

/Li电池的电化学行为和LiNi

0.5

1.5

材料表面形貌。结果表明，当在电解液中添加20% （体积分数）BMIMTFSI时，LiNi

0.5

1.5

/Li电池在

室温、0.2C下的最高放电比容量是126.81 mA·h·g

-1

，5C下的放电比容量为109.36 mA·h·g

-1

，比在1 mol·L

-1

LiPF

-EC/DMC电解液中的放电比容量提高了91.7%；且该电池在0.2C下循环50圈后的放电比容量保持率在95%左右，比用碳酸酯类电解液提高了近10%。SEM结果表明，在碳酸酯类电解液中加入BMIMTFSI后，LiNi

0.5

1.5

电极表面附着了一层均匀且致密的固态电解质界面（SEI）膜。

Abstract

The functionalized ionic liquids 1-butyl-3-methylimidazoliumbis(trifluoromethanesulfonyl)imide (BMIMTFSI) was synthesized as a high-pressure lithium ion battery electrolyte additive for inhibiting the oxidation of organic solvents to enhance carbonic acid. The electrochemical behaviors of LiNi

0.5

1.5

/Li batteries and the surface morphology of LiNi

0.5

1.5

electrode were studied by charge-discharge test

electrochemical impedance spectroscopy (EIS)

cyclic voltammetry (CV) and scanning electron microscopy (SEM). The results show that when 20% (vol) BMIMTFSI is added to carbonate-based electrolyte

the highest discharge capacity of LiNi

0.5

1.5

/Li cells is 126.81 mA·h·g

-1

at 0.2C rate

and the discharge capacity is 109.36 mA·h·g

-1

at high rate of 5C

which is 91.7% higher than that in 1.0 mol·L

-1

LiPF

-EC/DMC electrolyte. And the discharge capacity retention rate of LiNi

0.5

1.5

/Li cells reaches about 95% after 50 cycles at 0.2C rate

which is nearly 10% higher than that with blank electrolytes. The results of SEM showed that a uniform and compact solid electrolyte interface (SEI) film was attached to the surface of LiNi

0.5

1.5

electrode after adding BMIMTFSI to carbonate-based electrolyte.

关键词

Keywords

references

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