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- Title
Combustion Characteristics of Lithium-ion Electrolyte with a Focus on the Role of LiPF6 Salt and Liquid-Vapor Equilibrium.
- Authors
Chao Ding; Binbin Xu; Weiwei Wang; Xuehui Wang; Jian Wang
- Abstract
This paper is focused on the assessment of fire hazards of lithium-ion electrolytes. The electrolytes are flammable mixtures that contain LiPF6 salt, which release toxic gas during the burning process. The combustion behavior of lithium-ion electrolytes is studied using a series of pool-fire experiments through typical fire parameters, including flame radiation, burning rate, and fuel temperature. The liquid--vapor phase equilibrium process of electrolyte solvents is also analyzed based on phase-equilibrium theory. The results show that the burning process of the electrolyte is controlled by different components at different burning stages. The burning process of electrolyte pool fires can be divided into three distinct stages: (I) a low-boiling-point-component-controlled stage, (II) an intermediate transition stage, and (III) a high-boiling-point-component-controlled stage. The LiPF6 salt can obviously influence the flame luminosity of the pool fire in stage I, but has almost no influence on the radiant heat flux of the flame. The LiPF6 salt mainly influences stage II and stage III, in which a large amount of smoke gas is released. Stage II may be halted to extinguish owing to the high concentration of salt, and the EC/DMC and EC/DEC/DMC electrolyte mixtures become extinguished and cannot continue to burn. The vapor--liquid phase diagram for two binary electrolytes is made based on phase-equilibrium theory, and the predicted boiling point agrees well with the measured boiling temperature.
- Subjects
COMBUSTION research; FLAMMABILITY; ELECTROLYTE analysis; ELECTROLYTES; LITHIUM ions; LITHIUM compounds; VAPOR-liquid equilibrium; THERMAL properties
- Publication
Acta Microscopica, 2019, Vol 28, Issue 6, p1556
- ISSN
0798-4545
- Publication type
Article