Re-evaluation of the eutectic region of the LiBr-KBr-LiF system | Zendy

L. Redey | Zendy; R.A. Guidotti | Zendy

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Re-evaluation of the eutectic region of the LiBr-KBr-LiF system

Author(s) -

L. Redey,

R.A. Guidotti

Publication year - 1996

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/238472

Subject(s) - eutectic system , liquidus , melting point , electrolyte , molten salt , materials science , thermal , analytical chemistry (journal) , chemistry , thermodynamics , metallurgy , electrode , microstructure , composite material , chromatography , alloy , physics

The separator pellet in a thermal battery consists of electrolyte immobilized by a binder (typically, MgO powder). The melting point of the electrolyte determines the effective operating window for its use in a thermal battery. The development of a two-hour thermal battery required the use of a molten salt that had a lower melting point and larger liquidus range than the LiCl-KCl eutectic which melts at 352 C. Several candidate eutectic electrolyte systems were evaluated for their suitability for this application. One was the LiCl-LiBr-KBr eutectic used at Argonne National Laboratories for high-temperature rechargeable batteries for electric-vehicle applications. Using a custom-designed high-temperature conductivity cell, the authors were able to readily determine the liquidus region for the various compositions studied around the original eutectic for the LiBr-KBr-LiF system. The actual eutectic composition was found to be 60.0 m/o LiBr-37.5 m/o KBr-2.5 m/o LiF with a melting point of 324 {+-} 0.5 C

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