The selection of separator materials for lithium batteries is crucial in order to improve their safety performance. At present, the most commonly used is inorganic ceramic coating, and the main material of inorganic ceramic coating slurry is alumina particles. Large particles are not easy to stabilize in the slurry and are prone to settling and agglomeration. Therefore, dispersing alumina powder with ultrasonic waves is crucial for the stability of the slurry.

Why choose alumina as the separator material for lithium batteries?

The commonly used diaphragm materials can be divided into organic resin coatings, metal and alloy coatings, and ceramic coatings. Aluminum oxide (Al2O3) is one of the most commonly used ceramic coating materials, which has quite good properties such as biocompatibility, wear resistance, good thermal stability, high mechanical strength, high light transmittance, corrosion resistance, etc. It maintains the advantages of traditional ceramic materials such as high temperature resistance, wear resistance, and corrosion resistance, while maintaining the structural strength of the substrate material. Due to the thickness of ceramic coatings usually being within one millimeter, it greatly reduces the negative weight of parts, and its thermal shock resistance is better than that of whole ceramics.

What role does ultrasound play in dispersing alumina?

The particle size of alumina in coating applications restricts the quality of the product, and refining it solely with a grinder cannot meet the needs of enterprises. Ultrasonic dispersion ultrasonic technology, as a physical means and tool, can generate a series of similar conditions in the medium of chemical reactions. Energy can not only excite or promote many chemical reactions, accelerate the speed of chemical reactions, but also change the direction of certain chemical reactions, which can make alumina particles reach about 1200 mesh.