Experimental and kinetic study on the stabilities and gas generation of typical electrolyte solvent components under oxygen-lean oxidation and pyrolysis conditions

The safety concerns of lithium-ion batteries (LIBs) due to thermal runaway hinder their broad applications. Flammable electrolytes are the major cause of gas venting and fire hazards of LIB, particularly when limited oxygen can be released because of the degradation of cathode materials. However, studies on the combustion characteristics of electrolytes under highly incomplete conditions, corresponding to thermal runaway scenarios, are limited. Therefore, a comprehensive experimental and kinetic study of three typical electrolyte solvents, namely, dimethyl carbonate (DMC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC), was performed under oxygen-lean and pyrolysis conditions. The experiments were conducted in a jet-stirred reactor with equivalence ratios of 2.5, 5.0, and ∞ at atmospheric pressure, and the temperature ranged from 600 to 1100 K. Primary gas products, including H 2 , CH 4 , C 2 H 4 , C 2 H 6 , CH 3 OH, C 2 H 5 OH, CO, and CO 2 , were quantified using gas chromatography. Results revealed that the consumption onset temperatures were in the order of DEC∼EMC更多