Thermal response core-shell structure fire extinguishing agent applicable to lithium ion battery and preparation method of thermal response core-shell structure fire extinguishing agent

Abstract

The invention relates to a thermal response core-shell structure fire extinguishing agent applicable to a lithium ion battery and a preparation method of the thermal response core-shell structure fireextinguishing agent. The thermal response core-shell structure fire extinguishing agent comprises a shell and a core, wherein the shell comprises a thermal response polymer; the core comprises a fireextinguishing agent or a flame retardant; the core is wrapped by the shell to form a microcapsule; and the shell has a state that the conformation is converted into extension from collapse and the fire extinguishing agent or the flame retardant inside is released when a set temperature is met outside. The invention discloses that the thermal response polymer is adopted as a shell material for wrapping the fire extinguishing agent in the core. The thermal response polymer self is capable of sensing ambient temperatures and takes effective response effects into play, and at an LCST (lower critical solution temperature), the conformation of the conformation can be changed. The LCST of the thermal response polymer is adjusted to be approximately equal to the upper limit of a safe window temperature, and when the temperature of electrolyte is higher than the LCST, the thermal response polymer is turned into an expansion state from collapse, and then the fire extinguishing agent in the corecan be released.

Description

technical field [0001] The invention relates to the field of fire fighting, in particular to a heat-responsive core-shell structure fire extinguishing agent suitable for lithium-ion batteries and a preparation method thereof. Background technique [0002] As the core component of new energy vehicles, lithium batteries have achieved good results in my country's automotive lithium battery industry. However, the safety issues of lithium battery electric vehicles are also very prominent. Recently, the continuous fire incidents of new energy electric vehicles have once again detonated the topic of potential safety hazards of electric vehicles. The safety of lithium-ion batteries for new energy electric vehicles has become an important factor restricting the development of new energy vehicles. [0003] Thermal runaway is a key issue in lithium battery safety research, and thermal runaway of batteries can cause fire or even explosion. At present, battery thermal runaway and batte...

AI Technical Summary

Problems solved by technology

However, the safety window of lithium-ion batteries is generally between 0-100°C. At present, the melting temperature of materials commonly used as coating fire extinguishing agents is above 180°C (such as polyvinylidene fluoride-hexafluoropropylene). Not adjustable, the fire extinguishing agent capsule core material intervenes later, and the response time is longer

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