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Electrochemical characterization of poly(vinylidenefluoride)-zinc triflate gel polymer electrolyte and its application in solid-state zinc batteries

Kumar, Girish G and Sampath, S (2003) Electrochemical characterization of poly(vinylidenefluoride)-zinc triflate gel polymer electrolyte and its application in solid-state zinc batteries. In: Solid State Ionics, 160 (3-4). pp. 289-300.

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Abstract

Gel polymer electrolyte (GPE) films comprising of poly(vinylidenefluoride), propylene carbonate, ethylene carbonate and zinc trifluoromethane sulfonate are prepared and characterized. The composition of GPE is optimized to contain minimum liquid components with a maximum specific conductivity of $3.94 \times 10^-3 \hspace{2mm} S \hspace{2mm} cm^{-1}$ at (25 \pm 1)°C. A detailed investigation on the properties such as ionic conductivity, transport number, electrochemical stability window, reversibility of $Zn/Zn^{2+}$ couple and Zn/gel electrolyte interfacial stability have been carried out. The ionic conductivity follows a VTF behaviour with an activation energy of about 0.0014 eV. Cationic transport number varies from 0.51 at 25°C to 0.18 at 70°C. Several cells have been assembled with GPE as the electrolyte, zinc as the anode, $\gamma-MnO_2$ as the cathode and their charge–discharge behaviour followed. Capacity values of 105, 82, 64 and 37 mAh/g of $MnO_2$ have been achieved at 10, 50, 100 and $200\mu A/cm^2$ discharge current densities, respectively. The discharge capacity values are almost constant for about 55 cycles for all values of current densities. Cyclic voltammetric study of $MnO_2$ electrode in $Zn/GPE/MnO_2$ cell clearly shows intercalation/deintercalation of $Zn^{2+}$.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Gel polymer electrolyte;Poly(vinylidenefluoride);Zinc triflate;g-MnO2;Rechargeable battery;AC impedance;Zn/GPE interface
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 24 Apr 2007
Last Modified: 19 Sep 2010 04:37
URI: http://eprints.iisc.ernet.in/id/eprint/10741

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