Abstract: Increasing attention is being paid to safety concerns, particularly those associated with the risk of fires caused by the use of organic solvent electrolytes with high volatility and flammability. The fire hazards of electrolytes are closely linked to their chemical properties, as they are prone to thermal runaway under high temperature conditions, overcharging, and mechanical damage, leading to battery combustion or explosion. A comprehensive analysis of the fire hazards of electrolytes and their impact on the safety of lithium-ion batteries is presented in this paper. Research progress in the development of safer electrolyte materials since 2019 is reviewed from the perspectives of thermal stability, flame retardancy, and resistance to overcharging. The objective of this study is to provide a scientific foundation and reference for the design and development of safer electrolytes for future lithium-ion batteries.

Key words: lithium-ion battery, electrolyte, thermal stability, flame retardancy, overcharge resistance