This technology involves a separator that features a ceramic coating layer on a porous substrate, with a core-shell structured fiber layer containing fire-extinguishing agents directly laminated on top. In the event of high-temperature ignition, the extinguishing agent in the core is released to suppress combustion and prevent thermal shrinkage.
Conventional separators are prone to short circuits due to thermal deformation and shrinkage of the polyolefin substrate at high temperatures, and fire suppression is difficult due to the volatility of the electrolyte during external combustion. Furthermore, methods involving the coating of functional particles often suffer from particle rupture during the lamination process, which reduces the fire-extinguishing effectiveness during actual ignition.
This technology utilizes a ceramic coating layer on top of a porous substrate and employs electrospinning to directly laminate a core-shell fiber layer—consisting of a phosphorus-based flame retardant in the core and a polymer in the shell—to protect the flame retardant during normal operation and release it when the shell melts during ignition. Applicable to electric vehicle pouch cells and large-scale ESS modules, it can reduce self-extinguishing time to under 30 seconds, effectively delaying the spread of thermal runaway to adjacent cells.
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