New Network-Gel-Electrolytes Consisting
of Polyethylene Glycol Diacrylate, LiBF₄, and 1-Buthyl-3-
Methylimidazolium Tetrafluoroborate, Added with Alkylene
Carbonates: the Ion Transfer Mechanism and Properties

O. V. Yarmolenko^a,z, A. V. Yudina^a, E. Yu. Evshchik^a, A. V. Chernyak^a, A. A. Marinin^b,
V. I. Volkov^a, and T. L. Kulova^c

^aInstitute of Problems of Chemical Physics, Russian Academy of Sciences,
pr. akad. Semenova 1, Chernogolovka, Moscow oblast, 142432 Russia

^bZAO Aviatsionnyi Konsalting–TEKHNO, ul. Yaroslavskaya 8/5, Moscow, Russia

^cFrumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119071 Russia

Received July 7, 2014

Abstract—Polymer gel-electrolytes based on polyethylene glycol diacrylate, LiBF₄ salt, ethylene carbonate,
propylene carbonate, and 1-buthyl-3-methylimidazolium tetrafluoroborate ionic liquid, are synthesized by
using radical polymerization. For the optimal composition (polyethylene glycol diacrylate, 19 wt %; LiBF₄, 10
wt %; 1-buthyl-3-methylimidazolium tetrafluoroborate, 44 wt %; ethylene carbonate, 27wt %) the conductivity
is maximal: 2.5 10^–3 S/cm at 20C; 1.1 10^–2 S/cm at 100C. The system remains thermostable up to 107C.
It was shown, by using NMR with the pulsed magnetic field gradient, that the polymer matrix is solely involved
in the Li⁺ ion solvation in the electrolyte composed of polyethylene glycol diacrylate, LiBF₄, and 1-buthyl-3-meth-
ylimidazolium tetrafluoroborate; and the Li⁺ self-diffusion coefficients do not depend on the ionic liquid content.
When the electrolyte is added with alkylene carbonates, both the polymer matrix and the solvent are involved in the
Li⁺ ion solvation. The highest conductivity of 10^–3 S/cm (at 20C) was reached when 27wt% of ethylene carbon-
ate have been added; here Li⁺ ions are entirely solvated by ethylene carbonate molecules, the diffusion coeffi-
cient being equal to 10^–11 m²/s.

Keywords: polymer electrolyte, polyethylene glycol diacrylate, ionic liquid, lithium ion, NMR, self-diffusion
coefficients

DOI: 10.1134/S1023193515050183

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