O'Connor & Company
Encapsulated fire-retardant materials to improve battery safety
This invention provides a battery, such as a lithium-ion battery, that includes an encapsulated fire-retardant material. In some embodiments, stable polymer spheres are used to encapsulate an effective fire-retardant material. Under normal operating conditions, the fire-retardant material does not contact the electrolyte, cathode, or anode, thus minimizing performance reduction that occurs when fire-retardant materials are in the direct presence of the electrolyte. Under thermal runaway or excessive temperatures, the fire retardant material vaporizes through the melted encapsulating phase, thereby releasing fire-retardant material to minimize or prevent flammability in the battery.
HRL Laboratories, LLC
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Ping Wen
Liu Li