Preparation and Characterization of PVC / PMMA Blend Polymer Electrolytes Complexed with LiN ( C 2 F 5 SO 2 ) 2 (original) (raw)
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Preparation and characterization of PVC/PMMA blend polymer electrolytes complexed with LiN(CF3SO2)2
Solid State Ionics, 2002
Thin films of polymer blend electrolytes comprising Poly(vinyl chloride) (PVC) and Poly(methyl methacrylate)(PMMA) and plasticized with a combination of ethylene carbonate (EC) and propylene carbonate (PC) for different lithium imide salt, LiN(C 2 F 5 SO 3) 2 , concentrations were prepared using the solution casting technique. The films were subjected to a. c. impedance measurements as a function of temperature ranging from-30 °C to 70 °C. The variation of ionic conductivity as a function of temperature and PVC content in the blend was analysed. The role of PMMA in the phenomena occurring at the interface between the plasticized polymer electrolyte and lithium electrode was also studied. The cast films were also subjected to TG/DTA and FT-IR studies which are discussed.
Polímeros, 2005
The lithium salt (x) (X= LiAsF 6 , LiPF 6 , LiN(C 2 F 5 SO 2) 2 , LiN(CF 3 SO 2) 2 , LiBF 4) was complexed with a host of poly(vinyl chloride) (PVC)/ poly(methyl methacrylate) (PMMA) blend polymer and plasticized with a combination of ethylene carbonate (EC) and propylene carbonate(PC). The polymer electrolyte films were prepared for constant PVC/ PMMA blend ratio. The electrochemical stability and thermal stability of the solid polymer electrolytes were reported. The role of PMMA to the phenomena occurring at the interface between the electrolyte and the lithium metal electrode was explored.
Ionic conductivity and FT-IR studies on plasticized PVC/PMMA blend polymer electrolytes
Journal of Power Sources, 2000
Ionic conductivities of plasticized poly vinylchoride PVC rpoly methylmethacrylate PMMA blend electrolyte films containing Ž. Ž. two different lithium salts, viz., lithium tetrafluroborate LiBF and lithium perchlorate LiClO are studied using the AC impedance 4 4 Ž. Ž. technique at 258C, 408C, 508C and 608C. A mixture of ethylene carbonate EC and propylene carbonate PC is used as the plasticizer. Pure PMMA and PMMA-rich phases exhibited better conductivity. The variation of ionic conductivity for different plasticizer contents and for different lithium salts is reported. The variation in film morphology is examined by scanning electron microscopic examination. Ž. Finally, the existence of ion-ion pairs has been identified using Fourier Transform Infrared analysis FT-IR measurements.
Thermochimica Acta, 2010
In this paper, temperature dependence of ionic conductivity, crystallographic structural, morphological and thermal characteristics of polymer blends of PMMA and PVC with lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) as a dopant salt are investigated. The study on the temperature dependence of ionic conductivity shows that these polymer blends exhibit Arrhenius behavior. The highest ionic conductivity was achieved when 70 wt% of PMMA was blended with 30 wt% of PVC. Xray diffraction (XRD) and scanning electron microscopy (SEM) reveal the amorphous nature and surface morphology of polymer electrolytes, respectively. In DSC analysis it was found that the glass transition temperature (T g ) and melting temperature (T m ) decreased, whereas the decomposition temperature (T d ) increased. In contrast, the shift towards higher decomposition temperature and decrease in weight loss of polymer electrolytes, in TGA studies, indicates that the thermal stability of polymer electrolytes improved.
PMMA-PVC polymer blend systems with LiTFSI as dopant salt were prepared by solution casting technique. Studies were then performed to explore the ionic conductivity, crystallographic structure, morphology, and thermal properties of these polymer electrolytes. XRD and SEM reveal amorphous behavior and morphologies of polymer electrolytes, respectively. Coherent length was calculated to determine the amorphousity of polymer complexes. Ionic conductivity was calculated using ac-impedance spectroscopy. DSC measurements revealed a decrease in T g , whereas T m and T d were enhanced. The thermal properties of polymer electrolytes were found to enhance upon addition of 30 wt% LiTFSI. Increase in thermal stability of polymer electrolytes were further confirmed through TGA studies.
Conductivity and thermal studies of blend polymer electrolytes based on PVAc–PMMA
Solid State Ionics, 2006
The polymer electrolytes comprising blend of poly(vinyl acetate) (PVAc) and poly(methylmethacrylate) (PMMA) as a host polymer and LiClO4 as a dopant are prepared by solution casting technique. The amorphous nature of the polymer–salt complex has been confirmed by XRD analysis. The DSC thermograms show two Tg's for PVAc–PMMA blend. A decrease in Tg with the LiClO4 content reveals the increase of segmental motion. Conductance spectra results are found to obey the Jonscher's power law and the maximum dc conductivity value is found to be 1.76 × 10− 3 S cm− 1 at 303 K for the blend polymer complex with 20 wt.% LiClO4, which is suitable for the Li rechargeable batteries. The conductivity–temperature plots are found to follow an Arrhenius nature. The dc conductivity is found to increase with increase of salt concentration in the blend polymer complexes.
Effect of complexing salt on conductivity of PVC/PEO polymer blend electrolytes
Bulletin of Materials Science, 2011
Solid polymer electrolyte membrane comprising poly(vinyl chloride) (PVC), poly(ehylene oxide) (PEO) and different lithium salts (LiClO 4 , LiBF 4 and LiCF 3 SO 3 ) were prepared by the solution casting technique. The effect of complexing salt on the ionic conductivity of the PVC/PEO host polymer is discussed. Solid polymer electrolyte films were characterized by X-ray diffraction, FTIR spectroscopy, TG/DTA and ac impedance spectroscopic studies. The conductivity studies of these solid polymer electrolyte (SPE) films are carried out as a function of frequency at various temperatures ranging from 302 K to 353 K. The maximum room temperature ionic conductivity is found to be 0⋅079 × 10 -4 S cm -1 for the film containing LiBF 4 as the complexing salt. The temperature dependence of the conductivity of polymer electrolyte films seems to obey the Vogel-Tamman-Fulcher (VTF) relation.
Ionic conduction in plasticized PVC/PAN blend polymer electrolytes
Ionics, 2008
Blended polymer electrolytes with poly(vinyl chloride) (PVC)–poly(acrylonitrile) (PAN) were prepared with different plasticizer concentrations and constant lithium perchlorate (LiClO4) 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.
Studies on Solid Polymer Electrolyte Based on PEO/PVC Blends
2007
Novel polymer blend electrolyte was prepared using poly (ethylene oxide), polyvinyl chloride) and lithium perchlorate (LiCI0 4) as the complexing salt by employing solvent casting technique The prepared films were subjected to XRD, FTIR, ac impedance spectroscopy and thermogravimetry / differential thermal analysis (TQ/OTA) Quantitative analysis of the FTIR spectra provides the specific interactions between the constituents The thermal stability of the film is found using TG/DTA studies The maximum conductivity value of PVC (25)-PEO(75)~LiCI0 4 {8) film is found as 1 32 x 10 5 S/cm at room temperature As the PVC concentration increases in the electrolyte, the conductivity is found to decrease The temperature dependent ionic conductivity is also carried out in the temperature range 303-333K and the results are discussed
Preparation and characterization of plasticized high molecular weight PVC-based polymer electrolytes
2010
Poly(vinyl chloride) (PVC)-based polymer electrolytes films consisting of lithium trifluromethanesulfonate (LiCF 3 SO 3)-ethylene carbonate (EC) were prepared by the solution-casting method. Ionic conductivities of the electrolytes have been determined by an impedance studies in the temperature range of 298-373 K. Complexation of the prepared electrolytes is studied by X-ray diffraction (XRD) analysis. Thermogravimetric analysis (TGA) was used to confirm the thermal stability of the polymer electrolytes. The conductivity-temperature plots were found to follow an Arrhenius nature. All these films are found to be thermally stable until 132-167 • C.