As one of the most popular research directions, the application safety of battery technology has attracted more and more attention, researchers in academia and industry are making efforts to develop safer flame retardant battery. The battery consists of electrolyte, separator, electrode and shell, the traditional flame retardant method of battery i. ••Flame retardant modification of electrolyte for improving battery safety is discussed.••The development of flame retardant battery separators for battery performance and safety are investigated.••New battery flame retardant technologies and their flame retardant mechanisms are introduced.Flame retardancyLithium batteryElectrolyteSeparatorBattery technology has developed rapidly in recent years, which has become the next generation energy storage technology with the most potential to replace fossil energy,. The current mainstream battery technologies include solid-state batteries, fuel cells, lithium-air battery, lithium-sulfur batteries, graphene battery, etc,,,,. With the occurrence of more and more battery safety accidents, the development of new battery technology with stable, flame-retardant, and efficient has become the focus of current research.Nowadays, the most widely used battery product is lithium battery. Lithium batteries are widely used in mobile phones, laptops, electric vehicles and many other application scales,,,,. Lithium batteries have high energy density, which are about 6-7 times compared to that of lead-acid batteries. The energy density of the most advanced commercial lithium-ion batteries can reach 250 Wh/kg,,, and its service life can reach more than 6 years. The battery 1 C (100% DoD), whose positive electrode is made up of lithium ferrous phosphate, can be used for 10000 times. The self-discharge rate of lithium battery is very low, which is one of the most outstanding advantages of the battery. At present, the self-discharge rate of lithium batteries can be less than 1% per month, less than 1/20 of that of nickel metal hydride batteries. Lithium batteries are green and environmentally friend. Electrolyte is the key part of battery, which affects the electrical performance and safety of battery,,,. Generally, lithium battery electrolyte is composed of lithium salt and organic solvent, and it is usually easy to burn,. When the battery is short circuited, the electrolyte as fuel will burn quickly. Therefore, d.
