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| - Test of Reaction Kinetics Using Both Differential Scanning and Accelerating RateCalorimetries As Applied to the Reaction of LixCoO2 in Non-aqueous Electrolyte
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| - Extracting reliable reaction kinetics from nonisothermal calorimetric results can be difficult. The reactionmodel, activation energy, and frequency factor make up a “kinetic triplet” for a particular reaction and definethe reaction kinetics. One expects a good correlation between data and the predictions of the reaction modelfor a variety of experiments, provided the reaction triplet has been well determined. Such a correlation isexpected for the results of accelerating rate calorimeter (ARC) and differential scanning calorimeter (DSC)experiments. As an example, the reaction of LixCoO2 in nonaqueous electrolyte (as is important in Li-ionbattery safety) has been studied with both DSC and ARC. Comparing the shape of ARC profiles to thosepredicted theoretically limits the choice of reaction model. The activation energy is determined from the shiftof the DSC profile with heating rate or from the change in the initial self-heating rate of ARC samples as afunction of temperature. The frequency factor is then chosen to give the correct DSC peak temperature andcorrect self-heating rate. Calculated DSC and ARC curves fit experiment well for several related reactionmodels.
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