Journal
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
Volume 39, Issue 9, Pages 6711-6720Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13369-014-1192-6
Keywords
Polymer electrolyte; Ionic liquid; Electrospun; Rechargeable lithium batteries
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Funding
- Natural Science Foundation of China [21174119]
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In this study, a fibrous nanocomposite polymer electrolyte (NCPE) based on poly(vinylidene fluoride-co-hexafluoropropylene) was prepared through a electrospinning technology. Effects of SiO2 nanoparticles and diethyl carbonate (DEC) on the electrochemical properties of the fibrous NCPE are investigated by linear sweep voltammetry, cyclic voltammogram and electrochemical impedance spectroscopy. The electrolyte uptake and ionic conductivity of the fibrous NCPE are enhanced due to incorporation of SiO2 nanoparticles. Addition of DEC into the electrolyte promotes not only the electrochemical stability but also the ionic conductivity of the fibrous NCPE. The fibrous NCPE has a high ionic conductivity up to 3.48 x 10(-3) S cm(-1) at 25 A degrees C when it (incorporated with 5 wt% SiO2) absorbs the electrolyte of 1 mol l(-1) LiBF4/EMIBF4-DEC (2:1 in volume). It exhibits good lithium striping and depositing properties during cycling accompanying with a discounted thermally stable temperature of 148 A degrees C. The Li/LiFePO4 cells using this NCPE membrane as separator exhibit good rate capability and cycling performance, suggesting its promising application in rechargeable lithium batteries.
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