Effect of Different Cations on Ion-Transport Behavior in Polymer Gel Electrolytes Intended for Application in Flexible Electrochemical Devices

• Published in: Journal of electronic materials Vol. 51; no. 3; pp. 1371 - 1384
• Main Authors: Bhatt, Pinakin J., Pathak, Nimisha, Mishra, Kuldeep, Kanchan, D. K., Kumar, Deepak
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-03-2022; Springer Nature B.V
• Subjects: Banded structure; Cations; Characterization and Evaluation of Materials; Chemistry and Materials Science; Conduction; Dimethyl ether; Electrochemistry; Electrode polarization; Electrolytes; Electronic materials; Electronics and Microelectronics; Instrumentation; Ion currents; Ion dynamics; Magnesium perchlorates; Materials Science; Optical and Electronic Materials; Original Research Article; Polymer gels; Polymers; Room temperature; Sodium; Sodium perchlorate; Solid State Physics; Vinylidene; Vinylidene fluoride; effect of different cations; electrochemical impedance spectroscopy; Polymer gel electrolytes; ion conduction behavior; electrolyte materials for flexible electrochemical devices
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-021-09398-2

This paper reports the effect of different cations (Na, Mg and Li) while keeping perchlorate as the common anion on ion-dynamics behavior within polymer gel electrolytes containing tetraethylene glycol dimethyl ether (TEGDME) solvent and poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) as the polymer host. FTIR investigations demonstrate significant changes in characteristic bands, while XRD observations indicate prominent structural variation in terms of merger/suppression of phases when NaClO
4
, Mg(ClO
4
)
2
and LiClO
4
salts are immobilized in the PVdF-HFP/TEGDME matrix. The highest room temperature ionic conductivity of 1.2 × 10
−3
S cm
−1
with high dielectric constant value has been obtained for the Li
+
conducting electrolyte composition due to its superior electrochemistry and ion-conduction behavior as compared to its Na
+
and Mg
2+
counterparts. In the low-frequency region, modulus curves reveal polarizing effects with long-range mobility/migration of Na/Mg/Li ions, while in the high-frequency region, a peak onset relating the translational ion dynamics and conductivity relaxation is observed. The reported polymer gel electrolytes may be employed as electronic materials for developing next-generation flexible electrochemical devices.