Flame-retardant ceramic slurry for lithium battery coating diaphragm and preparation method of flame-retardant ceramic slurry

Abstract

The invention discloses a flame-retardant ceramic slurry for a lithium battery coating diaphragm and a preparation method of the flame-retardant ceramic slurry, wherein the slurry comprises inorganicparticles, an intumescent flame retardant, a dispersing agent, a binding agent, a thickening agent and a solvent; the preparation method comprises the following steps of adding the inorganic particles, the dispersing agent, the thickening agent and the solvent into a ball mill according to the proportion to be dispersed, so as to obtain a dispersion liquid; and then adding the binding agent and the intumescent flame retardant into the dispersion liquid, and carrying out dispersing by using a dispersing machine to prepare the flame-retardant ceramic slurry. The ceramic slurry disclosed by the invention can improve the heat resistance of the diaphragm, the lithium battery can be prevented from burning and exploding in a large range, and the safety performance of the lithium battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium batteries, in particular to a flame-retardant ceramic slurry for coating diaphragms of lithium batteries and a preparation method thereof. technical background [0002] Energy-saving and environmentally friendly new energy has become the main strategic orientation of my country's auto industry. Due to its high energy density, high working voltage, no memory effect and long cycle life, lithium batteries are widely used in the power supply of various mobile devices, and gradually become the main energy system in the field of energy storage and electric vehicles. At the same time, security risks are also becoming increasingly prominent. [0003] One of the key factors affecting the safety performance of lithium batteries is the safety of the diaphragm. At present, the diaphragm of lithium batteries is mainly made of polyolefin materials, which have poor heat resistance, especially in terms of fire resistance,...

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Problems solved by technology

[0004] CN 206422130U discloses a special ceramic diaphragm for lithium batteries. The diaphragm uses nano-magnesium oxide as a high-temperature flame-resistant coating. Although the price is relatively cheap, its flame-retardant effect is general, and a large amount of magnesium oxide needs to be coated to achieve the flame-retardant effect. Greatly increases the weight of the diaphragm

CN 206401409U discloses a special ceramic diaphragm for lithium batteries, which can improve the resistance of the diaphragm by coating the ceramic surface with a silicate flame-retardant layer, a halogen-free flame-retardant insulating polyurea coating and an isothiazolinone resin coating. However, this method requires four layers of coating on the surface of the base membrane, which not only greatly increases the thickness of the diaphragm, but also has a cumbersome coating process, which reduces the production efficiency of the diaphragm.

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