Solid-State EDLC Device Based on Magnesium Ion-Conducting Biopolymer Composite Membrane Electrolytes: Impedance, Circuit Modeling, Dielectric Properties and Electrochemical Characteristics

Ahmad S F M Asnawi; Shujahadeen B Aziz; Salah R Saeed; Yuhanees M Yusof; Rebar T Abdulwahid; Shakhawan Al-Zangana; Wrya O Karim; Mohd F Z Kadir

doi:10.3390/membranes10120389

Solid-State EDLC Device Based on Magnesium Ion-Conducting Biopolymer Composite Membrane Electrolytes: Impedance, Circuit Modeling, Dielectric Properties and Electrochemical Characteristics

Membranes (Basel). 2020 Dec 2;10(12):389. doi: 10.3390/membranes10120389.

Authors

Ahmad S F M Asnawi¹, Shujahadeen B Aziz^{2

3}, Salah R Saeed⁴, Yuhanees M Yusof¹, Rebar T Abdulwahid^{2

5}, Shakhawan Al-Zangana⁶, Wrya O Karim⁷, Mohd F Z Kadir⁸

Affiliations

¹ Chemical Engineering Section, Universiti Kuala Lumpur Malaysian Institute of Chemical & Bioengineering Technology (UniKL MICET), Alor Gajah 78000, Malacca, Malaysia.
² Hameed majid Advanced Polymeric Materials Research Lab., Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Iraq.
³ Department of Civil Engineering, College of Engineering, Komar University of Science and Technology, Sulaimani 46001, Iraq.
⁴ Charmo Research Center, Charmo University, Peshawa Street, Chamchamal, Sulaimani 46001, Iraq.
⁵ Department of Physics, College of Education, Old Campus, University of Sulaimani, Kurdistan Regional Government, Sulaimani 46001, Iraq.
⁶ Department of Physics, College of Education, University of Garmian, Kalar 46021, Iraq.
⁷ Department of Chemistry, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Iraq.
⁸ Centre for Foundation Studies in Science, University of Malaya, Kuala Lumpur 50603, Malaysia.

Abstract

The polymer electrolyte based on Dx:Cs:Mg(CH₃COO)₂:Ni with three different glycerol concentrations have been prepared. The impedance study has verified that the electrolyte with 42 wt.% of glycerol (A3) has the highest ionic conductivity of 7.71 × 10^-6 S cm^-1 at room temperature. The ionic conductivity is found to be influenced by the transport parameters. From the dielectric analysis, it was shown that the electrolytes in this system obeyed the non-Debye behavior. The A3 electrolyte exhibited a dominancy of ions (t_ion > t_e) with a breakdown voltage of 2.08 V. The fabricated electrochemical double layer capacitor (EDLC) achieved the specific capacitance values of 24.46 F/g and 39.68 F/g via the cyclic voltammetry (CV) curve and the charge-discharge profile, respectively. The other significant parameters to evaluate the performance of EDLC have been determined, such as internal resistance (186.80 to 202.27 Ω) energy density (4.46 Wh/kg), power density (500.58 to 558.57 W/kg) and efficiency (92.88%).

Keywords: energy storage device; ion conducting membrane; magnesium acetate; metal complex; polymer blend; transference number measurement (TNM) and linear sweep voltammetry (LSV) analyses; transport study.