Relaxation time and conductivity of comb‐like gel polymer electrolytes

Abstract

Using the copolymer of acrylonitrile (AN), methyl methacrylate (MMA), and poly(ethylene glycol) methyl ether methacrylate as a backbone and poly(ethylene glycol) methyl ether (PEGME) with 1100 molecular weight as side chains, comb-like gel polymers and their Li salt complexes were synthesized. The dynamic mechanical properties and conductivities were investigated. Results showed that the gel copolymer electrolytes possess two glass transitions: a-transition and b-transition. Based on the time-temperature equivalence principle, a master curve was constructed by selecting T a as reference temperature. By reference to T 0 ¼ 508C, the relation between log t c and c was found to be linear. The master curves are displaced progressively to higher frequencies as the content of plasticizer is increased. The relation between log t p and the content of plasticizer is also linear.

Structural, thermal, and impedance properties of a gel polymer electrolyte containing ionic liquid

“…Results show that the addition of ionic liquid to the gel polymer electrolytes leads to an increase in conductivity as compared with the polymer electrolytes without ionic liquid. [18] For the copolymer-BMImBF 4 (50)-LiClO 4 electrolytes, the conductivity reaches the value of 4 Â 10 À4 S cm À1 at room temperature when the LiClO 4 concentration is 1.0 mol kg À1 polymer. Detailed analysis of conductivity for the system will be reported in other papers.…”

“…In the present study, we present the gel polymer electrolytes containing ionic liquid based on the copolymer of acrylonitrile (AN), methyl methacrylate (MMA), poly (ethylene glycol) methyl ether methacrylate (PEGMEMA) reported before. [17][18] The copolymer having ethylene oxide side chains is preferred as a polymer matrix because of its low glass transition temperature and good mechanical properties. [17] The gel polymer electrolytes are obtained by the copolymerization of monomers in 1-butyl-3-methylimidazolium tetrafluoroborate (BMImBF 4 ).…”

Preparation of polymer-coated separators using an electron beam irradiation

“…Intrinsic SPE has excellent mechanical properties and no safety issues, such as thermal runaway and LE leakage, but a drawback of low ionic conductivity (10 À5 S/cm) at room temperature. Many researches have been reported to overcome these problems of LE and SPE [4][5][6][7][8][9][10].…”