Interactive Effect of the Polymer on Carrier Migration Nature in the Chemically Cross-Linked Polymer Gel Electrolyte Composed of Poly(ethylene glycol) Dimethacrylate

Abstract

The diffusion coefficient and conductivity of the chemically cross-linked polymer gel electrolyte composed of poly(ethylene glycol) dimethacrylate and LiBF 4 -EC/EMC were measured in order to investigate the effect of the polymer on the nature of carrier migration in the gel. With an increase of the polymer fraction in the gel, the dissociation degree of the salt in the gel increased. This indicates that the polymer accelerated the dissociation of the salt in the progress of gelation. The dissociated cation and anion showed a different manner of change in the activation energy of diffusion with gelation. The cation, through Coulombic interaction, showed a decrease in activation energy, revealing a change in the migration mechanism to hopping on the oxygen sites linked with the segmental motion of the chains. The anion, on the other hand, showed an increase in the activation energy of diffusion. This means that the conduction mechanism essentially follows, as in solution, the mobility of the solvent correlated with enhanced viscosity due to gelation.

Structure and ionic conductivity of liquid crystals having propylene carbonate units

“…Aer heating up to 80 C the diffusion was measured during cooling. 45,46 The molar conductivity L imp was calculated from the ionic conductivity s i obtained from impedance measurements by the following equation Using the diffusion coefficients D Li and D F from the NMR measurements the molar conductivity L NMR can be calculated by applying the Nernst-Einstein relationship for univalent electrolytes. Because of the lower molecular weight of 4a, the substance contains a higher molar salt concentration.…”

“…The calculation of the Haven ratio was done according to the approach by Kii and coworkers. 45,46 The molar conductivity L imp was calculated from the ionic conductivity s i obtained from impedance measurements by the following equation Using the diffusion coefficients D Li and D F from the NMR measurements the molar conductivity L NMR can be calculated by applying the Nernst-Einstein relationship for univalent electrolytes.…”

A Thermoplastic Gel Electrolyte for Stable Quasi‐Solid‐State Dye‐Sensitized Solar Cells

“…Figure 3 shows plots where the measured conductivity is fitted to the Arrhenius equation (Eq. 2) [30] and the Vogel-Tammann-Fulcher (VTF) equation (Eq. 3).…”

“…The first quasi-solid-state DSSC was constructed by integrating polyacrylonitrile, ethylene carbonate, propylene carbonate (PC), acetonitrile, and NaI in 1995; [28] however, the photoelectric efficiency of the cell was only 4.4 %. In subsequent efforts, many different polymer gel electrolytes have been used to construct quasi-solid-state DSSCs, [8,[11][12][13][14][29][30][31][32][33][34][35][36][37][38] and Dye-sensitized solar cells (DSSCs) are receiving considerable attention as low-cost alternatives to conventional solar cells. In DSSCs based on liquid electrolytes, a photoelectric efficiency of 11 % has been achieved, but potential problems in sealing the cells and the low long-term stability of these systems have impeded their practical use.…”

Oligomer ethylene glycol based electrolytes for dye‐sensitized solar cell

“…The data in Figure 3 are turn to lnσ versus 1/ T plots as shown in Figure 4, and the Arrhenius relationship is also changed as the eq. (2) 14 Where σ is the conductivity, A is a constant, E a is activation energy and R is the universal gas constant.…”