Radiation Synthesis and Properties of Imidazolium Hexafluorophosphate Poly(ionic liquid) Gel Electrolytes

Xing-xiao Li; Dong Han; Ting-rui Lin; Yu Cui; Jing Peng; Jiu-qiang Li; Mao-lin Zhai

doi:10.11777/j.issn1000-3304.2017.17210

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Radiation Synthesis and Properties of Imidazolium Hexafluorophosphate Poly(ionic liquid) Gel Electrolytes

Research Article | 更新时间：2021-01-26

- Radiation Synthesis and Properties of Imidazolium Hexafluorophosphate Poly(ionic liquid) Gel Electrolytes
- Acta Polymerica Sinica Vol. 49, Issue 3, Pages: 349-355(2018)
- 作者机构：
  
  北京大学化学与分子工程学院教育部高分子化学与物理重点实验室北京分子科学国家实验室北京 100871
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17210
  CLC：
- Published：20 March 2018，
  
  Received：2 August 2017，
  
  Revised：26 August 2017，
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Xing-xiao Li, Dong Han, Ting-rui Lin, Yu Cui, Jing Peng, Jiu-qiang Li, Mao-lin Zhai. Radiation Synthesis and Properties of Imidazolium Hexafluorophosphate Poly(ionic liquid) Gel Electrolytes. [J]. Acta Polymerica Sinica 49(3):349-355(2018)
DOI：

Xing-xiao Li, Dong Han, Ting-rui Lin, Yu Cui, Jing Peng, Jiu-qiang Li, Mao-lin Zhai. Radiation Synthesis and Properties of Imidazolium Hexafluorophosphate Poly(ionic liquid) Gel Electrolytes. [J]. Acta Polymerica Sinica 49(3):349-355(2018) DOI： 10.11777/j.issn1000-3304.2017.17210.

摘要

以1-乙烯基-3-烷基咪唑六氟磷酸盐C

vimPF

(

12)为单体

6-亚己基)-双(3-乙烯基咪唑)六氟磷酸盐为交联剂

六氟磷酸锂为添加剂

混合碳酸酯为溶剂

采用辐射引发聚合、交联合成了新型的聚离子液体凝胶电解质(简称PC

vimPF

-Li GPE)

并研究了离子液体单体侧链长度、单体浓度、交联剂含量对PC

vimPF

-Li GPE性能的影响.结果表明所合成的PC

vimPF

-Li GPE具有良好的力学性能和高离子电导率

最大离子电导率可达7.18 mS/cm.

Abstract

Poly(ionic liquid)s have been used as electrolytes in lithium-ion battery due to their good electrochemical properties and thermal stability.In this work

we firstly synthesized organic poly(ionic liquid) gel

vimPF

-ray radiation inducing polymerization of 1-alkyl-3-vinylimidazolium hexafluorophosphate ([C

vim]PF

) (

12)

with 1

1'-(1

6-ethylidene)-bis(3-vinylimidazolium) hexafluorophosphate as crosslinking agent in a mixed carbonate ester solution.The gel fraction of the resultant gel increased along with the radiation absorbed dose

while the degree of equilibrium swelling (EDS) of the gel decreased

and the changes of the gel fraction and EDS were no longer obvious with the radiation absorbed dose above 20 kGy.FTIR results showed that the characteristic vibration absorption peaks of C=C for[C

vim]PF

from 1654 cm

-1

to 1656 cm

-1

disappeared after radiation

indicating the successful synthesis of PC

vimPF

gel.TGA experiment indicated that PC

vimPF

gel was of good thermal stability.Based on this PC

vimPF

gel

a novel gel polymer electrolyte (GPE)

vimPF

-Li GPE

was prepared by adding 1 mol/L LiPF

into monomer solution using one-step radiation synthesis.Effects of the alkyl chain length of the monomer

the contents of the monomer and the crosslinking agent on the property of PC

vimPF

-Li GPE were investigated.The obtained PC

vimPF

-Li GPE exhibited good mechanical property and high ionic conductivity.The ionic conductivity of the GPE increased with the decrease of monomer concentration and alkyl chain length

and changed slightly with the content of crosslinking agent.As the monomer concentration increased

the compressive strength (

) of the GPE increased

and the compressive strain (

) decreased.The

of the GPE ranged from 40 kPa to 1685 kPa

and its ionic conductivity from 1.5 mS/cm to 7.18 mS/cm.The highest ionic conductivity (7.18 mS/cm) was obtained for a sample prepared using 0.4 mol/L C

vimPF

monomer solution containing 8 mol% of crosslinker and 1 mol/L LiPF

.It is expected that the resultant PC

vimPF

-Li GPE is a promising candidate for lithium-ion battery electrolytes.

关键词

1-乙烯基-3-烷基咪唑六氟磷酸盐聚离子液体凝胶电解质锂离子电池

Keywords

1-Alkyl-3-vinylimidazolium hexafluorophosphatePoly(ionic liquid)sGel polymer electrolytesLithium-ion battery

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School of Materials Science and Engineering, Southeast University

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