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The Single‐Electrode Peltier Heats of Li‐Al Alloy Electrodes in LiCl ‐ KCl Eutectic System
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1994
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Materials ScienceElectrical EngineeringEngineeringHigh Temperature MaterialsLiquid Phaseγ PhaseEnergy StorageThermoelectric MaterialLi‐al Alloy ElectrodesBatteriesThermodynamicsHeat TransferSingle‐electrode Peltier HeatsThermal EngineeringAlloy PhaseThermoelectric PowerElectrochemistry
This paper presents the single‐electrode Peltier heat of cathodic (or anodic) reaction of Li‐Al alloy electrode in a coexisting phase state, or an intermetallic compound phase state estimated by thermoelectric‐power measurement. The thermoelectric‐power measurements of Li‐Al alloys in various coexisting phase states were carried out with both potentiometric and potential‐sweep methods in the eutectic system between 673 and 843 K. The values of the thermoelectric power of Li‐Al alloys calculated by using thermodynamic literature data were in good agreement with those obtained by experiment. The single‐electrode Peltier heat changes drastically with change of its phase state, and it was found that the formation reactions of and phases are exothermic, and those of liquid phase from β and γ phase are endothermic. The single‐electrode Peltier heat for the cathodic formation reaction of Li‐Al alloy in intermetallic compound γ phase is estimated to be exothermic by using the measured values of thermoelectric powers of Li‐Al alloys in(β+γ) and regions.