Abstract
The motion of the ion pairs under the applied electric field is an important phenomenon in the storage properties of the capacitive devices. In this study, two different molecules, 1,3,6,8-pyrenetetrasulfonic acid tetrasodium salt hydrate (P4) and tetra-alkyl ammonium bromide (TAAB), were used as ionic groups in the PVA gel electrolytes. The counter ions of P4 and TAAB are Na+ and Br – and their masses (about 23 and 80 g/mole) are much smaller than the masses of their host molecules \({\mathrm{P}}_{4}^{-4}\) and TAAB+1 (about 524 and 322 g/mole). Three different PVA gel electrolytes in slab configurations were synthesized and characterized: PVA gel electrolyte including only P4, only TAAB, and mixture of these ionic groups. The binary system was obtained by putting the gel electrolyte including TAAB on the gel electrolyte including P4. cyclic voltammetry (CV), and galvanostatic charge discharge (GCD) techniques were used to characterize the electrolytes. The results of the proposed binary gel polymer electrolyte were compared with single and mixture electrolytes. It was observed that since P4 and TAAB host molecules are highly massive, they can shield some part of the counter ions when an electric field was applied. In addition, the agglomeration of the TAAB molecules in the PVA matrix causes trapping the counter ions in the dense regions and prevents the motion of the counter ions under the applied field and then induces the increasing internal resistance. Therefore, the effective mass of TAAB molecules increases considerably, and when an electric field is applied, they move slowly.
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Öztürk, T.P., Gelir, A., Keshtiban, N.A. et al. Synthesis and characterization of PVA-based binary-gel electrolytes including massive ions. J Solid State Electrochem 27, 885–894 (2023). https://doi.org/10.1007/s10008-023-05390-4
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DOI: https://doi.org/10.1007/s10008-023-05390-4