Experimental study on the explosion characteristics of lithium-ion electrolyte solvent/air mixture
In this study,we conducted vapor explosion experiments on the typical lithium-ion electrolyte solvent ethyl methyl carbonate(EMC)using an explosion limit and ignition energy test platform.Consequently,we measured for the first time the maximum explosion pressure(Pmax),lower explosion limit(LFL),and other basic parameters of EMC's explosion risk at different initial temperatures and equivalent ratios.We also analyzed the kinetic mechanism of the combustion chemical reaction by numerical simulation.The results show that the Pmax of the EMC/air mixed gas first increases and then decreases with increasing equivalent ratio,reaching a maximum near the equivalent ratio ϕ=1.2.Additionally,as the temperature increases,Pmax decreases and exhibits a linear relationship with the reciprocal of the initial temperature 1/T0 because of the thermal loss,Pmax,exp is smaller than the maximum adiabatic explosion pressure Pmax,ad under the same working conditions.The LFL of EMC/air mixed gas decreases with increasing T0,showing a linear relationship,and the parameters of the classical model for fuel LFL are modified,with the new formula's predicted values agreeing well with the experimental values.The analysis of the reaction mechanism shows that the effect of different T0 on LFL is mainly due to the effect of the generation rate of OH radicals.The findings of this study provide insights for quantitatively assessing the explosion risk of EMC and provide references for developing corresponding safety standards for its practical use.
ethyl methyl carbonatemaximum explosion pressurelower flammability limitinitial temperatureequivalent ratio
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