Citation: 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, ;2018, (3): 349-355. doi: 10.11777/j.issn1000-3304.2017.17210 shu

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

Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry, Key Laboratory for Fundamental Science, The Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871

Corresponding author: Mao-lin Zhai, mlzhai@pku.edu.cn
Received Date: 2 August 2017
Revised Date: 26 August 2017

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, PC_nvimPF₆, by γ-ray radiation inducing polymerization of 1-alkyl-3-vinylimidazolium hexafluorophosphate ([C_nvim]PF₆) (n=6, 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_nvim]PF₆ from 1654 cm^-1 to 1656 cm^-1 disappeared after radiation, indicating the successful synthesis of PC_nvimPF₆gel.TGA experiment indicated that PC_nvimPF₆gel was of good thermal stability.Based on this PC_nvimPF₆gel, a novel gel polymer electrolyte (GPE), PC_nvimPF₆-Li GPE, was prepared by adding 1 mol/L LiPF₆ 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_nvimPF₆-Li GPE were investigated.The obtained PC_nvimPF₆-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 (σ_m) of the GPE increased, and the compressive strain (ε_m) decreased.The σ_m 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 C₆vimPF₆ monomer solution containing 8 mol% of crosslinker and 1 mol/L LiPF₆.It is expected that the resultant PC_nvimPF₆-Li GPE is a promising candidate for lithium-ion battery electrolytes.
- 1-Alkyl-3-vinylimidazolium hexafluorophosphate,
- Poly(ionic liquid)s,
- Gel polymer electrolytes,
- Lithium-ion battery
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