Development of ion conducting polymer gel electrolyte membranes based on polymer PVdF-HFP, BMIMTFSI ionic liquid and the Li-salt with improved electrical, thermal and structural properties

Shalu, .; Singh, Varun Kumar; Singh, Rajendra Kumar

doi:10.1039/c5tc00940e

Cited by 266 publications

(123 citation statements)

References 54 publications

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“…But they are in the range of 0.14-0.18 W m −1 K −1 due to the low thermal conductivity of PVDF-HFP (0.185 W m −1 K −1 ) and EMIM:DCA (0.186 W m −1 K −1 ) as measured by us and other labs. [32,33] At the EMIM:DCA loading of 80 wt%, the ionogel shows a ZT value of 0.75 (Figure 2c). The discontinuation of lattice vibration between two phases can lower the thermal conductivity.…”

Section: Resultsmentioning

confidence: 99%

Flexible Quasi‐Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties

Cheng

Fan

et al. 2019

Advanced Energy Materials

222

269

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Thermoelectric materials can be used to harvest low‐grade heat that is otherwise dissipated to the environment. But the conventional thermoelectric materials that are semiconductors or semimetals, usually exhibit a Seebeck coefficient of much less than 1 mV K−1. They are expensive and consist of toxic elements as well. Here, it is demonstrated environmental benign flexible quasi‐solid state ionogels with giant Seebeck coefficient and ultrahigh thermoelectric properties. The ionogels made of ionic liquids and poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVDF‐HFP) can exhibit a giant Seebeck coefficient up to 26.1 mV K−1, the highest for electronic and ionic conductors. In addition, they have a high ionic conductivity of 6.7 mS cm−1 and a low thermal conductivity of 0.176 W m−1 K−1. Their thermoelectric figure of merit (ZT) is thus 0.75. The giant Seebeck coefficient is related to the ion‐dipole interaction between PVDF‐HFP and ionic liquids. Their application in ionic thermoelectric capacitors is also demonstrated for the conversion of intermittent heat into electricity. They are especially important to harvest the low‐grade thermal energy that is abundant on earth.

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Section: Resultsmentioning

confidence: 99%

Flexible Quasi‐Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties

Cheng

Fan

et al. 2019

Advanced Energy Materials

222

269

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“…However, the liquid nature of ionic liquids (ILs) confines their direct application in devices due to portability and leakage problems. Thus by immobilizing ILs in a suitable polymer matrix to form IL gels, the mechanical properties of the resulting gel polymer electrolytes may be greatly enhanced thereby conserving the major properties of ionic liquids [18]. From the literature, few studies have accounted that the gel polymer electrolytes that are formulated by plasticizing imidazolium, pyrrolidinium and quaternary ammonium into various polymer matrices are compatible with those electrodes exhibiting high ionic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Effective influences of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIMTFSI) ionic liquid on the ion transport properties of micro-porous zinc-ion conducting poly (vinyl chloride) /poly (ethyl methacrylate) blend-based polymer electrolytes

Prasanna

Suthanthiraraj

2016

J Polym Res

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A series of new gel polymer electrolytes (GPEs) based on different concentrations of a hydrophobic ionic liquid (IL) 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIMTFSI) entrapped in an optimized typical composition of polymer blend-salt matrix [poly(vinyl chloride) (PVC) (30 wt%) / poly(ethyl methacrylate) (PEMA) (70 wt%) : 30 wt% zinc triflate Zn(CF 3 SO 3 ) 2 ] has been prepared using facile solution casting technique. The AC impedance analysis has revealed the occurrence of the maximum ionic conductivity of 1.10 × 10 −4 Scm −1 at room temperature (301 K) exhibited by the PVC/PEMA-Zn(OTf) 2 system containing 80 wt% ionic liquid. The addition of EMIMTFSI into the optimized PVC/ PEMA-Zn(OTf) 2 system in different weight percentages enhances the number of free zinc ions thereby leading to enrichment of ionic conductivity. The structural and complexation behaviour of the as prepared polymer gel electrolytes was substantiated by subjecting these electrolyte films to X-ray diffraction (XRD) and Attenuated total reflectance -Fourier transformed infrared (ATR-FTIR) investigations. The wider electrochemical stability window~3.23 V and a reasonable cationic transference number (t Zn 2+ ) of 0.63 have been attained for the polymer gel electrolyte film containing higher loading of (80 wt%) ionic liquid. The development of the amorphous phase of these gel polymer electrolyte membranes with increasing ionic liquid content was observed from scanning electron microscopic (SEM) analysis. The results of the current work divulge the assurance of developing GPEs based on ionic liquids for prospective application in zinc battery systems.

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“…From Table , it is observed that the P(VDF‐HFP) with 6 wt% of TiO 2 nanofibers fillers exhibits lower melting enthalpy and crystallinity, which indicates the formation of higher amorphous phase, compared to the other concentration of TiO 2 nanofibers fillers of esNCPFM samples. The observed difference in the crystallinity with the addition of different TiO 2 nanofibers fillers is may be due to the decrease in the volume fraction of the crystalline phase of the polymer and also the surface charges of the fillers act as facile nucleation centers, which reduce the nucleation rate, thus, reducing the crystallinity of the polymer matrixes . Further, it is confirmed by the XRD results.…”

Section: Resultsmentioning

confidence: 59%

Enhanced ionic conductivity of electrospun nanocomposite (PVDF‐HFP + TiO₂ nanofibers fillers) polymer fibrous membrane electrolyte for DSSC application

et al. 2018

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Electrospun pure polymer poly(vinylidene difluoride‐co‐hexafluoropropylene) [P(VDF‐HFP)] fibrous membrane (esPFM) and electrospun nanocomposite polymer [P(VDF‐HFP) + TiO2 nanofibers fillers (2, 4, 6, and 8 wt%)] fibrous membranes (esNCPFMs) were prepared using electrospinning technique. All the prepared fibrous membranes were soaked in an optimized electrolytes [0.1M of each LiI/NaI/KI/TBAI + 0.6M BMII + 0.05M I2 + 0.5M of tert‐butyl pyridine + (acetonitrile: (EC: PC) (1:1v/v)) (60:40)] solutions to obtain esPFM and esNCPFMs electrolytes and were characterized using differential scanning calorimetric (DSC), X‐ray diffraction (XRD), Fourier transform infrared (FTIR), and scanning electron microscope (SEM) techniques. Also, an electrolyte uptake behavior and ionic conductivity of all the prepared esPFM and esNCPFMs electrolytes samples were studied, respectively, using the calculated electrolyte uptake data and the resistance evaluated from the analysis of measured impedance data of each sample. The electrospun nanocomposite polymer (PVDF‐HFP + 6 wt% TiO2 nanofibers fillers) fibrous membrane electrolyte with LiI showed highest conductivity of 1.87 × 10−2 S/cm at room temperature, which was very good, compared to the liquid electrolyte systems. Transference number studies showed that the charge transport in the highest conducting 6 wt% of TiO2 nanofibers fillers of the esNCPFM sample with LiI is predominantly due to ions and has negligible electronic contribution. Hence, the newly developed high ionic conducting electrospun nanocomposite polymer (PVDF‐HFP + 6 wt% TiO2 nanofibers fillers) fibrous membrane with LiI can be a better electrolyte for developing high‐efficiency dye‐sensitized solar cells (DSSCs) application. POLYM. COMPOS., 40:1585–1594, 2019. © 2018 Society of Plastics Engineers

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Development of ion conducting polymer gel electrolyte membranes based on polymer PVdF-HFP, BMIMTFSI ionic liquid and the Li-salt with improved electrical, thermal and structural properties

Cited by 266 publications

References 54 publications

Flexible Quasi‐Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties

Flexible Quasi‐Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties

Effective influences of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIMTFSI) ionic liquid on the ion transport properties of micro-porous zinc-ion conducting poly (vinyl chloride) /poly (ethyl methacrylate) blend-based polymer electrolytes

Enhanced ionic conductivity of electrospun nanocomposite (PVDF‐HFP + TiO₂ nanofibers fillers) polymer fibrous membrane electrolyte for DSSC application

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Development of ion conducting polymer gel electrolyte membranes based on polymer PVdF-HFP, BMIMTFSI ionic liquid and the Li-salt with improved electrical, thermal and structural properties

Cited by 266 publications

References 54 publications

Flexible Quasi‐Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties

Flexible Quasi‐Solid State Ionogels with Remarkable Seebeck Coefficient and High Thermoelectric Properties

Effective influences of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIMTFSI) ionic liquid on the ion transport properties of micro-porous zinc-ion conducting poly (vinyl chloride) /poly (ethyl methacrylate) blend-based polymer electrolytes

Enhanced ionic conductivity of electrospun nanocomposite (PVDF‐HFP + TiO2 nanofibers fillers) polymer fibrous membrane electrolyte for DSSC application

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Enhanced ionic conductivity of electrospun nanocomposite (PVDF‐HFP + TiO₂ nanofibers fillers) polymer fibrous membrane electrolyte for DSSC application