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Ionic conductivity and electrochemical properties of nanocomposite polymer electrolytes based on electrospun poly(vinylidene fluoride-co-hexafluoropropylene) with nano-sized ceramic fillers

 

Prasanth Raghavana, Xiaohui Zhaoa, Jae-Kwang Kima, James Manuela, Ghanshyam S. Chauhana, Jou-Hyeon Ahna,, Changwoon Nahb

 

(a) Department of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University, 900 Gajwa-dong,Jinju 660-701, Republic of Korea

(b) Department of Polymer-Nano Science and Technology, Chonbuk National University, 664-14 Duckjin-dong, Jeonju 561-756, Republic of Korea 

 

Abstract

A series of nanocomposite polymer electrolytes (NCPEs) comprising nanoparticles of BaTiO3, Al2O3 or SiO2 were prepared by electrospinning technique. The nano-sized ceramic fillers were incorporated into poly(vinylidene fluoride-co-hexafluoropropylene) [P(VdF-HEP)] membranes during the electrospinning process. The resultant porous membranes are good absorbent of the liquid electrolyte and exhibit high electrolyte retention capacity. The presence of the ceramic nanoparticles has positive effect on the mechanical properties of the membranes. The ionic conductivity and the electrochemical stability window of the electrospun P(VdF-HFP)-based polymer are enhanced by the presence of the fillers. The cell Li/LiFePO4 based on the NCPE containing BaTiO3 delivers a discharge capacity of 164 mAh/g, which corresponds to 96.5% utilization of the active material. In comparison, the performance of Li/LiFePO4 cells with NCPEs containing Al2O3 and SiO2 was observed to be lower with respective discharge capacities of 153 and 156 mAh/g. The enhanced performance of the BaTiO3 based-NCPE is attributed mainly to its better interaction with the host polymer and compatibility with lithium metal.

 

Keywords: Lithium batteries, Composite polymer electrolyte, Electrospinning, Fibrousmembrane, Ceramic filler

 

© 2008 Published by Elsevier Ltd.

 

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