Ionic conduction in 70-MeV C{sup 5+}-ion-irradiated poly(vinylidenefluoride- co-hexafluoropropylene)-based gel polymer electrolytes
- Department of Physics, Tezpur University, Tezpur-784028 (India)
In an attempt to increase the Li{sup +}-ion diffusivity, poly(vinylidenefluoride-co-hexafluoropropylene)-(propylene carbonate+diethyl carbonate)-lithium perchlorate gel polymer electrolyte system has been irradiated with 70-MeV C{sup 5+}-ion beam of nine different fluences. Swift heavy-ion irradiation shows enhancement in ionic conductivity at lower fluences and decrease in ionic conductivity at higher fluences with respect to unirradiated gel polymer electrolyte films. Maximum room-temperature (303 K) ionic conductivity is found to be 2x10{sup -2} S/cm after irradiation with a fluence of 10{sup 11} ions/cm{sup 2}. This interesting result could be attributed to the fact that for a particular ion beam with a given energy, a higher fluence provides critical activation energy for cross linking and crystallization to occur, which results in the decrease in ionic conductivity. X-ray-diffraction results show decrease in the degree of crystallinity upon ion irradiation at low fluences ({<=}10{sup 11} ions/cm{sup 2}) and increase in crystallinity at higher fluences (>10{sup 11} ions/cm{sup 2}). Analysis of Fourier-transform infrared spectroscopy results suggests the bond breaking at a fluence of 5x10{sup 9} ions/cm{sup 2} and cross linking at a fluence of 10{sup 12} ions/cm{sup 2} and corroborate conductivity and x-ray-diffraction results. Scanning electron micrographs exhibit increased porosity of the polymer electrolyte after ion irradiation.
- OSTI ID:
- 20714058
- Journal Information:
- Journal of Applied Physics, Vol. 98, Issue 4; Other Information: DOI: 10.1063/1.2030417; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACTIVATION ENERGY
CARBON IONS
CARBONATES
CARBONIC ACID ESTERS
CRYSTALLIZATION
ELECTROLYTES
FOURIER TRANSFORM SPECTROMETERS
GELS
HEAVY IONS
INFRARED SPECTRA
ION BEAMS
IONIC CONDUCTIVITY
LITHIUM PERCHLORATES
MEV RANGE 10-100
MULTICHARGED IONS
POLYMERS
POROSITY
SCANNING ELECTRON MICROSCOPY
TEMPERATURE RANGE 0273-0400 K
X-RAY DIFFRACTION