Anti-reburning additive for electrolyte for high-nickel ternary lithium battery and preparation method

Abstract

The invention relates to an anti-reburning additive for an electrolyte for a high-nickel ternary lithium battery and a preparation method and belongs to the field of the safety of lithium batteries. The preparation method of the anti-reburning additive for the electrolyte for the high-nickel ternary lithium battery comprises the following steps of (a) fully mixing microporous glass powder with fluoroprotein at 20-40 DEG C and loading the fluoroprotein on the microporous glass powder; (b) blending the microporous glass powder on which the fluoroprotein is loaded with sodium bicarbonate, white carbon black, a coupling agent and a polyvinyl alcohol adhesive of which the mass concentration is 12% at 50-60 DEG C and granulating to obtain microspheres; and (c) spraying a silica sol solution on the microspheres to obtain the additive. The prepared microspheres are suspended on the surface of the electrolyte, the electrolyte is melted in the event of a fire and the microporous glass powder andfoam fluoroprotein form a layer of liquid, thereby isolating the air and preventing reburning when the fire is put out.

Description

technical field [0001] The invention relates to a high-nickel ternary lithium battery electrolyte anti-reburning additive and a preparation method, belonging to the field of lithium battery safety. Background technique [0002] The current commercialized power lithium-ion batteries are mainly lithium cobaltate, lithium manganate, lithium iron phosphate and nickel-cobalt-manganese ternary batteries. Power batteries require batteries with high energy density (corresponding to high cruising range) and high safety, while lithium cobalt oxide is not suitable for the field of power batteries because of its poor thermal stability (poor safety) (but with high pressure Density and energy density are currently the mainstream in the 3C field), while lithium manganese oxide has a low energy density and its application is limited. As an earlier developed technology, lithium iron phosphate has the advantages of excellent safety, environmental protection, and high cycle life, but the disad...

AI Technical Summary

Problems solved by technology

[0007] The existing technology mainly monitors and reminds people to put out the fire, but it may cause losses in special circumstances, such as people not being there; some patents use the addition of flame retardants, but the addition of flame retardants will affect the cycle performance of lithium batteries. The gas-generating substance decomposes non-combustible gas at high temperature and isolates the air to extinguish the fire. However, when the gas-generating substance is exhausted, it cannot play a role. Therefore, it is hoped to find a method to extinguish the fire after a fire and prevent re-ignition for a long time