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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. HAMBALI1,2,
Z.
ZAINUDDIN1,2,
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 Received: 7 November
2015/Accepted: 29 March 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;
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