Sains Malaysiana 45(11)(2016): 1697–1705

 

Studies of Ion Transport and Electrochemical Properties of Plasticized Composite

Polymer Electrolytes

(Kajian Pengangkutan Ion dan Sifat Elektrokimia Komposit Pemplastik Polimer Elektrolit)

 

D. HAMBALI^1,2, Z. ZAINUDDIN^1,2, I. SUPA’AT³ & Z. OSMAN¹*

 

¹Centre for Ionics, University of Malaya, 50603 Kuala Lumpur, Federal Territory, Malaysia

 

²Department of Physics, University of Malaya, 50603 Kuala Lumpur, Federal Territory

Malaysia

 

³Centre for Foundation Studies in Sciences, University of Malaya, 50603 Kuala Lumpur,

Federal Territory, Malaysia

 

Diserahkan: 7 November 2015/Diterima: 29 Mac 2016

 

ABSTRACT

The composite polymer electrolytes (CPEs) composed of polyacrylonitrile (PAN) as host polymer, lithium tetraflouroborate (LiBF₄) as dopant salt, dissoÅlved in the mixture of ethylene carbonate (EC) and dimethyl phthalate (DMP) as plasticizing solvent, with the addition of silica (SiO₂) as inorganic filler were prepared by the solution casting technique. The CPE films were prepared by varying the concentrations of SiO₂ from 1 to 5 wt. %. The CPE film containing 3 wt. % of SiO₂ exhibits the highest ionic conductivity of 1.36 × 10-2 S cm^-1 at room temperature while for temperature dependence studies, the plot obtained obeyed Arrhenius rule and the calculated activation energy was 0.11 eV. The ionic conductivity of the CPEs was found to depend on the concentration of ion pairs of dopant salt as showed by FTIR spectra. The calculated value of lithium ions transport number, tLi+ for the highest conducting CPE film was 0.15. This result indicates that anionic species are the main contributor to the total conductivity of the CPE. The CPE film has an electrochemical stability higher than the non-filler film.

 

Keywords: Composite polymer electrolytes; conductivity; FTIR; lithium tetraflouroborate; PAN

 

ABSTRAK

Komposit polimer elektrolit (CPEs) yang terdiri daripada poliakrilonitril (PAN) sebagai hos polimer, litium tetrafloroborat (LiBF4) sebagai garam pendop telah larutkan di dalam campuran etilina karbonat (EC) dan dimetil ftalat (DMP) sebagai pelarut pemplastik, dengan silika (SiO₂) sebagai filer tak organik, telah disediakan melalui kaedah tuangan larutan. Filem CPE telah disediakan dengan pelbagai kandungan SiO₂  dari 1 hingga 5 % bt. Filem CPE yang mengandungi 3 % bt. SiO₂ memberikan nilai kekonduksian pada suhu yang bilik tertinggi iaitu 1.36 × 10_-2 S cm-1. Kekonduksian bagi CPEs didapati bergantung kepada kandungan pasangan ion daripada garam pendop seperti yang ditunjukkan oleh spektra FTIR. Nilai bagi nombor pengangkutan ion litium, tLi+ untuk CPE filem dengan kekonduksian tertinggi adalah 0.15. Keputusan ini menunjukkan spesies anion adalah penyumbang utama kepada kekonduksian CPE. Filem CPE mempunyai kestabilan elektrokimia lebih tinggi daripada filem tanpa filer.

 

Kata kunci: FTIR; kekonduksian; komposit polimer elektrolit; litium tetrafloroborat; PAN

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*Pengarang untuk surat-menyurat; email: zurinaosman@um.edu.my