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Solid-state $Mg/MnO_2$ cell employing a gel polymer electrolyte of magnesium triflate

Kumar, Girish G and Munichandraiah, N (2000) Solid-state $Mg/MnO_2$ cell employing a gel polymer electrolyte of magnesium triflate. In: Journal of Power Sources, 91 (2). pp. 157-160.

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In view of the abundant resources, low costs and the relatively low reactivity of magnesium, solid-state batteries using this metal are. worthy of investigation in comparison with solid-state lithium batteries. For such cells, a gel polymer electrolyte (GPE) is prepared using polyacrylonitrile, propylene carbonate, ethylene carbonate and magnesium triflate. The composition of GPE is optimized in view of the minimum liquid components required for gel formation and maximum ionic conductivity. This is achieved by preparing several films with varying concentration of the constituents and measuring their ionic conductivity by AC impedance spectroscopy. Mg/GPE/$MnO_2$ cells are assembled and their discharge behaviour is studied. A capacity value of about 40 mA h per gram of $MnO_2$ is obtained. Cyclic 2 voltammetric experiments demonstrate qualitatively the reversible behaviour of the $MnO_2$ electrode. The Mg/GPE/$MnO_2$ cells are subjected to about 20 charge–discharge cycles with a consistent capacity of about 20 mA h $g^{-1}$ Cycle-life data is limited by surface. passivation of the magnesium negative electrode and poor rechargeability of the $MnO_2$ positive electrode. At present, the results show that the $Mg/GPE/MnO_2$ cells have an inferior performance in comparison with that of well-developed, lithium-based rechargeable batteries. Further extensive investigations are required to raise the performance of the magnesium-based rechargeable cells to practical levels.

Item Type: Journal Article
Publication: Journal of Power Sources
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Solid-state Mg/MnO2 cell;Gel polymer electrolyte;AC impedance;Discharge capacity;Cycle-life
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 13 Jul 2006
Last Modified: 19 Sep 2010 04:29
URI: http://eprints.iisc.ac.in/id/eprint/7832

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