Glycerolized Li+ Ion Conducting Chitosan-Based Polymer Electrolyte for Energy Storage EDLC Device Applications with Relatively High Energy Density.

Ahmed S F M Asnawi,Yuhanees M Yusof,Shujahadeen B Aziz,Saifful K Muzakir,Muhamad H Hamsan,Mohamad A Brza,Rebar T Abdilwahid,Muaffaq M Nofal,Mohd F Z Kadir

doi:10.3390/polym12061433

Abstract

In this study, the solution casting method was employed to prepare plasticized polymer electrolytes of chitosan (CS):LiCO2CH3:Glycerol with electrochemical stability (1.8 V). The electrolyte studied in this current work could be established as new materials in the fabrication of EDLC with high specific capacitance and energy density. The system with high dielectric constant was also associated with high DC conductivity (5.19 × 10−4 S/cm). The increase of the amorphous phase upon the addition of glycerol was observed from XRD results. The main charge carrier in the polymer electrolyte was ion as tel (0.044) < tion (0.956). Cyclic voltammetry presented an almost rectangular plot with the absence of a Faradaic peak. Specific capacitance was found to be dependent on the scan rate used. The efficiency of the EDLC was observed to remain constant at 98.8% to 99.5% up to 700 cycles, portraying an excellent cyclability. High values of specific capacitance, energy density, and power density were achieved, such as 132.8 F/g, 18.4 Wh/kg, and 2591 W/kg, respectively. The low equivalent series resistance (ESR) indicated that the EDLC possessed good electrolyte/electrode contact. It was discovered that the power density of the EDLC was affected by ESR.

Highlights

Renewable energy and high-performance energy devices are required for the human lifestyle because of the increasing demand for a clean environment [1]
Chitosan (CS):LiCO2 CH3 :Glycerol polymer electrolytes were prepared with a solution cast method
The electrolyte studied in this current work could be established as new materials in the fabrication of electrochemical double-layer capacitor (EDLC) with high specific capacitance, energy density, and power density

Summary

Introduction

Renewable energy and high-performance energy devices are required for the human lifestyle because of the increasing demand for a clean environment [1]. The principle of energy storage mechanism in this device is based on the non-Faradaic process, where the ions accumulate at the interfacial region in the form of a double-layer [2] This means only charge accumulation occurs between the electrode surfaces and the bulk electrolyte, and there is no electron transfer (i.e., Faradaic process). The activated carbon is intensively and extensively utilized as characterized by a large surface area, satisfactory chemical stability, and high electronic conductivity [9]. Another component in EDLC design is the electrolyte between the electrodes where solid polymer electrolytes (SPEs) with conductivity between ~10−4 and 10−3 Scm−1 have been used. There has been an increase in conductivity of dextran-ammonium nitrate (NH4 NO3 ) system from 3.00 ± 1.60 × 10−5 Scm−1 to

Methods

Results

Conclusion