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Xin Tang,Shenhua Song,Ravi Muchakayala,Zhongyi Zhang,Anji Reddy Polu 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
New magnesium ion conducting polymer electrolyte films are developed and their experimentalinvestigations are reported. The polymer electrolyte films are composed of various poly(vinylidenefluoride-co-hexafluoropropylene):magnesium trifluoromethanesulfonate compositions (PVdF-HFP:Mg(Tf)2 in weight ratio) with different quantities of 1-ethyl-3-methylimidazolium trifluoromethane-sulfonate ionic liquid (EMITf). X-ray diffraction reveals that the pristine PVdF-HFP polymer filmpossesses a semi-crystalline structure and its amorphicity increases with increasing Mg(Tf)2 and EMITfconcentrations. From thermal analysis, the melting temperature (Tm), relative crystallinity (xc) andthermal stability of the 90PVdF-HFP:10Mg(Tf)2 gel polymer electrolyte film doped with 40 wt.% EMITfare obtained as 112 8C, 21.8% and 355 8C, respectively. The room-temperature ionic conductivity of thegel polymer electrolyte film increases with increasing EMITf concentration and reaches a high value ofapproximately 4.63 10 3 S cm 1 at 40 wt.% EMITf due to its amorphicity increase and interconnectedpore structure. For the 40 wt.% EMITf electrolyte film, the temperature dependence of ionic conductivityfollows the Arrhenius relation with an activation energy of 0.35 eV. The electrochemical stabilitywindow of the 40 wt.% EMITf electrolyte film is determined as 4.8 V. The findings from this study arepromising and have great potential for practical ionic device applications, particularly in rechargeablemagnesium ion batteries.
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Ravi Muchakayala,Shenhua Song,Jingwei Wang,Youhua Fan,Manjunatha Bengeppagari,Jianjun Chen,Manlin Tan 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
A new gel polymer electrolyte based on 1-methyl-1-propylpyrrolidinium bis(trifluoromethyl sulfonyl)imide ([PMpyr][NTf2]) entrapped in poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) is prepared and optimized for flexible solid state supercapacitor applications. The structural, thermal, electrical and electrochemical properties of the ionic liquid gel polymer electrolyte membranes are studied by different characterization techniques. The transparent gel polymer electrolyte membranes exhibit high amorphicity and excellent thermal stability. The 20PVdF-HFP:80[PMpyr][NTf2] gel polymer electrolyte membrane possesses a high ionic conductivity (1.596 × 10−3 S cm−1) and wide electrochemical stability window (4.7 V) at room temperature. It is used as the electrolyte material for the fabrication of flexible electric double layer supercapacitors (EDLCs) with multiwalled carbon nanotube (MWCNT)-added and unadded activated carbon (AC) electrodes. The performances of flexible EDLCs are evaluated using cyclic voltammetry and galvanostatic charge–discharge measurements. The EDLC with MWCNT-added AC electrodes exhibits apparently higher specific capacitance of electrode (156.64 F g−1), specific energy (30.69 Wh kg−1) and specific power (4.13 kW kg−1) than that with AC electrodes. The cyclic stability of the former is still in a good condition at the 2000th charge–discharge cycle and much better than the latter. The present comparative study indicates that the 20PVdF-HFP:80[PMpyr][NTf2] gel polymer electrolyte is a good candidate for the development of flexible solid-state supercapacitors.
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