Ftir study of ion-pairing effects in plasticized polymer electrolytes

The blend-based polymer electrolyte consisting of poly (vinyl chloride) (PVC) and poly (ethylene glycol) (PEG) as host polymers and lithium perchlorate (LiClO 4 ) as the complexing salt was studied. An attempt was made to investigate the effect of TiO 2 concentration in the unplasticized PVC-PEG polymer electrolyte system. The XRD and FTIR studies confirm the formation of a polymer-salt complex. The conductivity results indicate that the incorporation of ceramic filler up to a certain concentration (15 wt.%) increases the ionic conductivity and upon further addition the conductivity decreases. The maximum ionic conductivity 0.012×10 −4 S cm −1 is obtained for PVC-PEG-LiClO 4 -TiO 2 (75-25-5-15) system. Thermal stability of the polymer electrolyte is ascertained from TG/DTA studies.

Section: Ftir Analysismentioning

confidence: 99%

Ionic conduction behavior in PVC–PEG blend polymer electrolytes upon the addition of TiO2

Rajendran

Babu

Devi

2008

“…This band has shifted to 1260, 1258 and 1253 cm 1 for systems plasticised with PEG200, PEG400 and PEG60o, respectively. Since these bands are all attributed to ion pairs [25,8] this implies that ion association occurs in all systems due to this mode. Upon comparing the three systems, we can deduce that there is a higher concentration of free ions in the system plasticised with PEG200 since ion association only contributes to the antisymmetric stretching mode, whereas in the systems plasticised with PEG40 o and PEG600, ion association is attributed to both the symmetric and antisymmetric stretching modes.…”

Section: Concentration Ofmentioning

confidence: 96%

“…In this work, low molecular weight PEG (Average Mw = 200, 400 and 600) is used as plasticiser in a polymer electrolyte system of PVC-LiCF3SO 3. Plasticiser interactions are investigated by looking at the changes in the vibrational modes of the triflate anion, particularly the SO3 antisymmetric and symmetric stretching modes which are sensitive to cation-anion interactions [2,8,15,[16][17][18]. The state of ion association in the polymer electrolytes will also be analysed.…”

Section: Introductionmentioning

confidence: 99%

“…Plasticisers such as ethylene carbonate (EC) [1][2][3][4][5][6], propylene carbonate (PC) [2,[7][8], dimethylformamide (DMF) [8][9], dimethylsulfoxide (DMSO) [6], poly(ethylene glycol) (PEG) [7,10], dioctyl phthalate (DOP) [11] and dibutyl phthalate (DBP) [11][12] have been used in polymer electrolytes to enhance their room temperature ionic conductivities. The conductivities of these electrolytes critically depend on the physical properties of the plasticiser such as its viscosity and dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

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Effects of plasticiser on the lithium ionic conductivity of polymer electrolyte PVC-LiCF3SO3

Subban

Ahmad

Kamarulzaman

et al. 2005

Abstract. Solid polymer electrolyte films based on poly(vinyl chloride)-lithium triflate (PVCLiCF3SO3) have been prepared by the solution-cast technique in various concentrations. The film with the highest conductivity was used to prepare plasticised polymer electrolyte films by using poly(ethylene glycol) (PEG) of different molecular weights, i.e., 200, 400 and 600 gmok ~. These films were prepared to study the effects of addition of low molecular weights PEG on the lithium ionic conduction of the PVC based polymer electrolyte. The films were charactefised by electrochemical impedance spectroscopy (EIS) and Fourier transform infrared-spectroscopy (FTIR).Results indicate that the molecular weight has an inverse effect on the conductivity and this has been accounted for by FTIR.

“…The infrared spectra of these materials vary according to their composition and may be able to show the occurrence of complexation [17][18][19][20][21][22] and interaction between the various constituents. The interaction between polymers, salt and plasticizer can induce change in the vibrational modes of the atoms or molecules in the material, which in turn change the physical and chemical properties of the constituents of the complex.…”

Section: Xrd Analysismentioning

confidence: 99%

Ionic conduction in plasticized PVC/PAN blend polymer electrolytes

Rajendran

Babu

Sivakumar³

2007

Blended polymer electrolytes with poly(vinyl chloride) (PVC)-poly(acrylonitrile) (PAN) were prepared with different plasticizer concentrations and constant lithium perchlorate (LiClO 4 ) ratio by the solution-casting technique. The structure and complexation of the prepared films were studied by X-ray diffraction and Fourier transform infrared spectroscopy. The effect of the plasticizer on the ionic conduction in these electrolytes was investigated using alternating current impedance measurement and discussed. The temperature-dependant ionic conductivity was carried out in the range 302-373 K. The prepared films were also examined by thermogravimetry/differential thermal analysis to determine their thermal stability.