PMMA based protonic polymer gel electrolytes

Chandra, Suresh; Sekhon, S. S.; Arora, Narinder

doi:10.1007/bf02375554

Cited by 73 publications

(49 citation statements)

References 24 publications

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“…It reaches a maximum value of 5.0×10 −3 S cm −1 at a concentration of 15 wt% of the polymer (PVdF-HFP) content, and thereafter, conductivity decreases by further addition of the polymer at room temperature (25°C). Similar types of observation have been reported earlier by few workers [20,21]. This observation is found to be in good agreement with the "breathing chain model" proposed by Chandra and co-workers [21,22].…”

Section: Resultssupporting

confidence: 92%

“…Similar types of observation have been reported earlier by few workers [20,21]. This observation is found to be in good agreement with the "breathing chain model" proposed by Chandra and co-workers [21,22]. According to this model, polymeric gels are considered to be consist of dissociated ions (free ions), ion pairs, undissociated salts, solvents, and polymeric chains existing either in folded or partially/fully unfolded form.…”

Section: Resultssupporting

confidence: 89%

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Electrical and electrochemical studies on magnesium ion-based polymer gel electrolytes

Tripathi

Jain

Gupta

et al. 2012

J Solid State Electrochem

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The development of polymer gel electrolyte system with high ionic conductivity is the main objective of polymer research. Electrochemical devices based on lithium ionconducting polymer electrolyte are not safe due to the explosive nature of lithium. An attempt has been made to synthesize magnesium ion-conducting polymeric gel electrolytes, poly (vinylidene fluoride-co-hexafluoropropylene)-propylene carbonate-magnesium perchlorate, PVdF(HFP)-PCMg(ClO 4 ) 2 using standard solution-cast techniques. The maximum room temperature ionic conductivity of the synthesized electrolyte system has been observed to be 5.0×10 −3 S cm −1 , which is quite acceptable from a device fabrication point of view. The temperature-dependent conductivity and the dielectric behavior were also analyzed. The pattern of the temperature-dependent conductivity shows the Arrhenius behavior. The dielectric constant ε r and dielectric loss ε i increases with temperature in the low-frequency region but almost negligible in the high-frequency region. This behavior can be explained on the basis of electrode polarization effects. The real part M r and imaginary part M i versus frequency indicate that the systems are predominantly ionic conductors. Further, the synthesized electrolyte materials have been checked for its suitability in energy storage devices namely redox supercapacitor with conducting polymer polypyrrole as electrode materials, and finally, it was observed that it shows good capacitive behavior in low-frequency region. Preliminary studies show that the overall capacitance of 22 mF cm −2 which is equivalent to a single electrode specific capacitance of 117 F gm −1 was observed for the above said supercapacitors.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 89%

Electrical and electrochemical studies on magnesium ion-based polymer gel electrolytes

Tripathi

Jain

Gupta

et al. 2012

J Solid State Electrochem

View full text Add to dashboard Cite

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“…Furthermore, an important point may be noted that the electrical conductivity of the gel electrolytes containing even 10 wt.% of the host polymer PVdF-HFP is slightly higher than that of the liquid electrolytes, EC-PC-salts sytems. Similar observations have recently been obtained and systematically studied by Chandra and co-workers [25,26] in a different system of PMMA based gel electrolytes. Such observations have been found to be in full agreement with the "Breathing Chain model" proposed by Chandra et al [25,26].…”

Section: Electrochemicalsupporting

confidence: 66%

“…Similar observations have recently been obtained and systematically studied by Chandra and co-workers [25,26] in a different system of PMMA based gel electrolytes. Such observations have been found to be in full agreement with the "Breathing Chain model" proposed by Chandra et al [25,26]. The final compositions of the gel electrolytes, PVdF-HFP (20 wt.%)-EC:PC (1:1 V/V)-I.0 M LiC104/NaC104/ TEAC104 salts, were chosen for the construction of EDLCs.…”

Section: Electrochemicalsupporting

confidence: 66%

Experimental studies on solid state electrical double layer capacitors using activated charcoal powder electrodes and PVdF-HFP based gel electrolytes

Hashmi

Kumar

Tripathi

2004

Ionics

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Abstract. Ion conducting polymeric gel electrolytes, based on poly vinylidine fluoride-cohexafluropropylene (PVdF-HFP)-ethylene carbonate (EC)-propylene carbonate (PC)-salts, LiC104, NaC104 and (C2H5)4NC104 (TEAC104), have been used in the fabrication of solid state electrical double layer capacitors (EDLCs) with activated charcoal powder electrodes. Comparative studies of different capacitor cells with different gel electrolytes have been carried out using a.c. impedance analysis, linear sweep-reversal voltammetry and galvanostatic charge-discharge techniques. The large values of overall capacitance of 50-100 mFcm z (equivalent to single electrode specific capacitance 50-77 Fg 1 of carbon) have been achieved. This corresponds to the energy density 1.6-2.7 Whkg -1. The values of the capacitance have been found to be almost stable up to 5000 voltammetric cycles. The comparative studies of different capacitor cells indicate that the charging processes and hence the coulombic efficiencies are highly affected by the size of the ions, accumulated at the interfaces of EDLCs.

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“…The increase in conductivity with the addition of polymer has been generally explained to be due to an increase in free ion concentration, although the exact mechanism is still not very clearly understood. In the case of polymer gel electrolytes containing weak acids [16,17,19], a breathing polymeric chain model has been proposed to explain an increase in free ion concentration with the addition of polymer. Recently similar results (r (gel) [ r (liquid)) have also been observed for some lithium ion conducting polymer gel electrolytes containing solvent with low value of dielectric constant [20].…”

Section: Resultsmentioning

confidence: 99%

Conductivity modification of proton conducting polymer gel electrolytes containing a weak acid (ortho-hydroxy benzoic acid) with the addition of PMMA and fumed silica

Kumar

Sekhon

2008

J Appl Electrochem

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Polymer gel electrolytes synthesized by dispersing nano size fumed silica in polymer gel electrolytes containing polymethylmethacrylate (PMMA), orthohydroxy benzoic acid (o-OHBA) and dimethylacetamide (DMA) have been studied by complex impedance spectroscopy, viscosity and pH measurements. The addition of acid, polymer and fumed silica has been found to result in an increase in conductivity and viscosity of gel electrolytes and gels with conductivity higher than the corresponding liquid electrolytes have been obtained. Nano dispersed polymer gel electrolytes show conductivity 2.95 9 10 -4 S cm -1 and viscosity 1.74 9 10 4 cP at 25°C. Two maxima observed in the variation of conductivity of nano dispersed gels with fumed silica concentration have been assigned to the enhanced dissociation of weak acid and the formation of a high conducting interfacial region between fumed silica and gel electrolyte, respectively, which has also been supported by pH and viscosity studies. The small increase in conductivity of nano dispersed gels over the 20-100°C temperature range and its constant value with time is suitable for devices.

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PMMA based protonic polymer gel electrolytes

Cited by 73 publications

References 24 publications

Electrical and electrochemical studies on magnesium ion-based polymer gel electrolytes

Electrical and electrochemical studies on magnesium ion-based polymer gel electrolytes

Experimental studies on solid state electrical double layer capacitors using activated charcoal powder electrodes and PVdF-HFP based gel electrolytes

Conductivity modification of proton conducting polymer gel electrolytes containing a weak acid (ortho-hydroxy benzoic acid) with the addition of PMMA and fumed silica

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