Effect of TiO2 nano fillers on ionic conductivity enhancement in Mg(BH4)2:polyethylene oxide (PEO) polymer gel electrolyte

Temperature dependence of ionic conductivity of three different compositions of the Mg(BH 4 ) 2 :polyethylene oxide (PEO):propylene carbonate (PC) polymer gel electrolyte with Mg(BH 4 ) 2 :PEO molar ratios of 1:8, 1:10, and 1:12 was studied. The composition with Mg(BH 4 ) 2 :PEO = 1:10 exhibited the...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2024-07, Vol.28 (7), p.2163-2173
Main Authors: Sarangika, H. N. M., Shashintha, H. T. G., Dissanayake, M. A. K. L., Senadeera, G. K. R.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Composition
Condensed Matter Physics
Electrochemistry
Electrolytes
Energy Storage
Fillers
Ion currents
Original Paper
Physical Chemistry
Polyethylene
Polyethylene oxide
Polymer gels
Polymers
Propylene
Rechargeable batteries
Temperature dependence
Titanium dioxide
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Summary:Temperature dependence of ionic conductivity of three different compositions of the Mg(BH 4 ) 2 :polyethylene oxide (PEO):propylene carbonate (PC) polymer gel electrolyte with Mg(BH 4 ) 2 :PEO molar ratios of 1:8, 1:10, and 1:12 was studied. The composition with Mg(BH 4 ) 2 :PEO = 1:10 exhibited the highest ionic conductivity of 7.60 × 10 −6 S cm −1 at 30 °C. The effect of TiO 2 nanofiller on ionic conductivity enhancement was studied for Mg(BH 4 ) 2 :PEO:PC:TiO 2 polymer gel electrolyte by varying the TiO2 weight ratio from 0 to 12.5 wt.%. The highest ionic conductivity of 17.95 × 10 −6 S cm −1 at 30 °C was exhibited by the electrolyte composition with 10 wt% of TiO 2 nanofiller. The optimized electrolytes had a Mg ++ cationic transference number of 0.22 for the filler free electrolyte and 0.30 for the TiO 2 10wt% filler incorporated electrolyte. Both electrolytes had negligible electronic conductivity. A more than two-fold increase in the ionic conductivity and a 30% increase in Mg ++ ion transference number can be attributed to the nanofiller effect caused by TiO 2 . This preliminary study shows the possibility of developing this PEO-based polymer gel electrolyte to be used in rechargeable Mg ion batteries.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-023-05748-8