Experimental study on the explosion characteristics of lithium-ion electrolyte solvent/air mixture

doi:10.19799/j.cnki.2095-4239.2024.0244

Abstract

Abstract:

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 (P_max), 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 P_max 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, P_max decreases and exhibits a linear relationship with the reciprocal of the initial temperature 1/T₀ because of the thermal loss, P_max,exp is smaller than the maximum adiabatic explosion pressure P_max,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.

Key words: ethyl methyl carbonate, maximum explosion pressure, lower flammability limit, initial temperature, equivalent ratio

CLC Number:

X 928.7

Jie WANG, Xiaoyao NING, Xuehui WANG, Jian WANG. Experimental study on the explosion characteristics of lithium-ion electrolyte solvent/air mixture[J]. Energy Storage Science and Technology, 2024, 13(10): 3480-3490.

Figures/Tables 11

Fig. 1

Fig. 2

Table 1

Experimental maximum explosion pressure Pmax,exp fitting coefficient changing with equivalence ratio"

温度/K	$a 0$	$a 1$	$a 2$	$a 3$	R²
340	-44.35369	1213.3063	-401.28781	-45.48856	0.99669
360	212.40567	373.4406	406.30778	-310.14377	0.99892
380	-138.77441	1388.33584	-626.53799	27.11049	0.9972

Table 1

Table 2

Simulated maximum explosion pressure Pmax,ad fitting coefficient changing with equivalence ratio"

温度/K	$a 0$	$a 1$	$a 2$	$a 3$	R²
300	-32.76072	1693.29955	-719.52981	17.87222	0.9993
320	-15.8188	1562.99867	-663.06814	17.30455	0.9991
340	-1.14051	1448.93148	-614.17417	17.11271	0.99929
360	11.66003	1348.36016	-571.55164	17.22104	0.99944
380	22.88976	1259.11266	-534.16236	17.56372	0.99957

Table 2

Fig. 3

Table 3

Table 4

Maximum adiabatic explosion pressure Pmax,ad fitting coefficient changing with temperature reciprocal 1/T0"

当量比 $ϕ$	k	d	R²
0.6	198.28893	68.78829	1
0.7	222.82119	61.26782	1
0.8	245.27285	50.99897	1
0.9	264.27652	40.75989	1
1	278.00888	34.91673	1
1.1	283.99354	38.90798	1
1.2	281.9118	52.50482	1
1.3	276.98075	1.09647	1
1.4	272.10566	72.00329	1

Table 4

Fig. 4

Fig. 5

Fig. 6

Fig. 7

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当量比ϕ	k	d	R²
0.6	180.98674	-1.11477	0.94465
0.7	153.12551	141.86729	0.97943
0.8	192.68075	76.80443	0.99931
0.9	219.14721	46.41482	0.95202
1	276.92451	-83.45078	0.98783
1.1	250.50593	6.25612	0.99974
1.2	258.7523	-9.57892	0.99969
1.3	254.5799	1.09647	0.97821
1.4	300.51253	-140.66437	0.9887

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