Abstract
Electrolytes are involved in the thermal runaway (TR) process of cells, which is a potential hazard in lithium-ion batteries (LIBs). Therefore, the effects of different mass ratio of carbonate solvents (ethylene carbonate (EC)/propylene carbonate (PC)/ethyl methyl carbonate (EMC)) with LiBF4 and different environmental pressure on the combustion characteristics of electrolyte such as flame centerline temperature, mass loss rate (MLR) and heat release rate (HRR) were analyzed. The combustion process could be divided into four stages: ignition, stable combustion stage, stable combustion with flame color change stage and extinguishing; with the decrease of pressure, the MLR of electrolyte declined and the combustion time prolonged, while the temperature of flame centerline increased.
Highlights
Lithium-ion battery (LIB) is a rapidly developing chemical power supply
1 mol/L of LiBF4 dissolved in ethylene carbonate (EC)/propylene carbonate (PC)/ethyl methyl carbonate (EMC) with a mass ratio of 12:38:50
Taking Electrolyte 1 (1 mol/L of LiBF4 dissolved in EC/PC/EMC with a mass ratio of 12:38:50) as an example, after the ignitor ignited the combustible vapor above liquid, flame radiation accelerated the evaporation of electrolyte, and the electrolyte pool fire quickly entered a stable combustion stage, which took 5–10 s in Hefei
Summary
Compared with other secondary batteries, it is environmentally friendly and has characteristics of high energy density, high output voltage, high output power, small discharge, wide working temperature and no memory effect [1,2,3]. Since its invention, it has developed rapidly and successfully reached commercial application. Under the low-temperature condition in high altitude areas, selecting LiBF4 as the lithium salt in electrolyte helps improving the performance of LIBs. The applicable scenario for this study is the electrolyte leakage from the battery.
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