Abstract
In this article, poly(ethylene oxide)-based polymer electrolyte films doped with ammonium iodide (NH4I) and plasticized with glycerol were provided by a solution casting method. In the unplasticized system, the maximum ionic conductivity of S cm−1 was achieved by the electrolyte comprised of 70 wt. % PEO:30 wt. % NH4I. The conductivity was further enhanced up to S cm−1) for the plasticized system when 10 wt. % glycerol was added to the highest conducting unplasticized one at ambient temperature. The films were characterized by various techniques to evaluate their electrochemical performance. The results of impedance spectroscopy revealed that bulk resistance (Rb) considerably decreased for the highest plasticized polymer electrolyte. The dielectric properties and electric modulus parameters were studied in detail. The LSV analysis verified that the plasticized system can be used in energy storage devices with electrochemical stability up to 1.09 V and the TNM data elucidated that the ions were the main charge carrier. The values of the ion transference number (tion) and electron transfer number (tel) were calculated. The nonappearance of any redox peaks in the cyclic voltammograms indicated that the chemical reaction had not occurred at the electrode/electrolyte interface.
Highlights
As to improve energy storage systems with efficient energy conservation and a low greenhouse gas emission, many attempts have been made of late to achieve high-performance components for generation batteries [1,2,3,4,5,6,7,8,9]
The conductivity and dielectric constant were improved with the addition of glycerol plasticizer to the PEO:NH4 I sample (PEOH4)
This leads to the creation of more free mobile ions by enhancing salt dissociation, and the conductivity was improved since no relaxation peaks appeared on both graphs [48]
Summary
As to improve energy storage systems with efficient energy conservation and a low greenhouse gas emission, many attempts have been made of late to achieve high-performance components for generation batteries [1,2,3,4,5,6,7,8,9]. As a complementary technology device, EDLCs can be deliberated as a potential alternative to conventional lithium batteries [11,12,13,14]. In this type of electrochemical capacitor, the mechanism of energy storage is based on the accumulation of charge at the surface of a carbon electrode that converts into potential energy [15,16,17]. The interaction among the electrodes and electrolytes and in all electrochemical mechanisms considerably impacts the active materials’ internal structure as well as the electrolyte and electrodes’ interface states [19,20]
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