Characteristics of Plasticized Lithium Ion Conducting Green Polymer Blend Electrolytes Based on CS: Dextran with High Energy Density and Specific Capacitance.

Elham M A Dannoun,Ranjdar M Abdullah,Shujahadeen B Aziz,Khaled H Mahmoud,Sozan N Abdullah,Ary R Murad,Muaffaq M Nofal,Mohd F Z Kadir

doi:10.3390/polym13213613

Abstract

The solution cast process is used to set up chitosan: dextran-based plasticized solid polymer electrolyte with high specific capacitance (228.62 F/g) at the 1st cycle. Fourier-transform infrared spectroscopy (FTIR) pattern revealed the interaction between polymers and electrolyte components. At ambient temperature, the highest conductive plasticized system (CDLG–3) achieves a maximum conductivity of 4.16 × 10−4 S cm−1. Using both FTIR and electrical impedance spectroscopy (EIS) methods, the mobility, number density, and diffusion coefficient of ions are measured, and they are found to rise as the amount of glycerol increases. Ions are the primary charge carriers, according to transference number measurement (TNM). According to linear sweep voltammetry (LSV), the CDLG–3 system’s electrochemical stability window is 2.2 V. In the preparation of electrical double layer capacitor devices, the CDLG–3 system was used. There are no Faradaic peaks on the cyclic voltammetry (CV) curve, which is virtually rectangular. Beyond the 20th cycle, the power density, energy density, and specific capacitance values from the galvanostatic charge–discharge are practically constant at 480 W/Kg, 8 Wh/Kg, and 60 F g−1, for 180 cycles.

Highlights

In the creation of solid polymer blend electrolytes (SPBEs) for energy storage devices, both natural and synthetic polymer materials have been widely used as host polymers [1]
It is worth noting that the charge transport process in composite materials is grave from both a theoretical and technical standpoint
The electrolyte/electrode interface might be regarded as a capacitance because blocking electrodes were utilized in the impedance study

Summary

Introduction

In the creation of solid polymer blend electrolytes (SPBEs) for energy storage devices, both natural and synthetic polymer materials have been widely used as host polymers [1]. Metal salts can be dissolved in a polymeric matrix and dissociated into metal cations and counter anions to make polymer electrolytes. These polymers are ionically conductive, and as a result, they have received a lot of interest because of their use in a variety of electrochemical devices [2]. Biopolymer materials (BPMs) demonstrated key features for use in electrochemical devices, high-energy-density batteries, sensors, and fuel cells, owing to some outstanding characteristics such as natural abundance; non-toxicity; renewability; cost effectiveness; biodegradability; eco–friendliness; harmlessness; and the fact it can be attained from natural resources such as cell walls, plants, and animals. The ability of chitosan to be molded into a variety of shapes is seen as a significant characteristic, with various shapes ranging from hydrogels to porous scaffolds to films [12]

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