Simultaneously introducing phosphorus-based flame retardants on both the cathode and anode sides—through flame-retardant separator coating and flame-retardant electrolyte additives—forms a "dual flame-retardant" barrier for lithium batteries. Experiments show this approach increases the onset temperature of thermal runaway in lithium metal batteries by 38°C, reduces the peak temperature by 120°C, and extends cycle life by 30%. It provides a scalable, low-impedance, high-safety solution for flame retardancy in high-end battery packs, directly meeting the stringent requirements for new energy vehicle battery pack flame retardancy in standards like GB 38031 and new European/American national regulations.
Flame Retardants Deep Inside the Cell: The synergistic effect of high heat-resistant ceramic-coated separators and phosphorus-containing flame-retardant electrolytes enables immediate pore closure and ion channel blockage at 160°C during nail penetration tests, achieving no smoke emission from single cells and zero thermal runaway propagation in modules. This provides dual insurance for lithium battery flame retardancy at both the cell and battery pack levels.
This report reveals how adhesives and flame retardants work together in new energy vehicle battery packs to block thermal runaway within 5 minutes, truly elevating the fire safety of electric vehicles.