A Novel Inorganic Low Melting Electrolyte for Secondary-Aluminum-Nickel Sulfide Batteries

H.A. Hjuler, S. von Winbrush, Rolf W. Berg, Niels Bjerrum

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A new, inorganic low melting electrolyte with the composition LiAlCl4-NaAlCl4-NaAlBr4-KAlCl4 (3:2:3:2) [or equivalentlyLiAlBr4-NaAlCl4-KAlCl4 (3:5:2)] has been developed. The melting point for this neutral melt is 86°C; the decompositionpotential is approximately 2.0V; the ionic conductivity is measured in the range 97°–401°C and is 0.142s cm–1 at100°C, and the density is 2.07g cm–3. The conductivity seems to be an almost linear combination of the conductivities ofthe four individual halo salts which form the melt. Other examined higher melting mixtures exhibit conductivities deviatingless than ±10% from their combination expectations. The low melting electrolyte is employed in the rechargeable batterysystem Al/electrolyte/Ni3S2 at 100°C. The open-circuit voltage of this system is from 0.82 to 1.0V. Dendrite-free aluminumdeposits are obtained. The cycling behavior of the battery system is reported.
Original languageEnglish
JournalJournal of The Electrochemical Society
Issue number4
Pages (from-to)901-906
Publication statusPublished - 1989

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Copyright The Electrochemical Society, Inc. [1989]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

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