Composition for fire extinguishing agent, fire extinguishing agent as well as preparation method and application of fire extinguishing agent

The invention relates to the technical field of safety of energy storage lithium ion batteries, and discloses a composition for a fire extinguishing agent, the fire extinguishing agent and a preparation method and application of the fire extinguishing agent. The composition comprises 60 to 90 wt% of a perfluorinated compound, 5 to 35 wt% of halogenated olefin, 2 to 25 wt% of a polar flame-retardant compound and 1 to 5 wt% of a solubilizer. The content mass ratio of olefin I to olefin II in halogenated olefin is 1: (1-2); the olefin I is propylene substituted by at least three halogen atoms and/or butylene substituted by at least three halogen atoms; halogen atoms in the olefin I comprise at least one Br and at least one F; the olefin II is propylene substituted by at least four halogen atoms; the halogen atoms in the olefin II comprise at least one Cl and at least one F. The fire extinguishing agent provided by the invention is high in fire extinguishing efficiency and low in toxicity, and can be widely appli