Advanced Technology Driving Battery Safety and Performance Upgrades

With the rapid growth of the global new energy industry, lithium-ion batteries have become a core energy solution for electric vehicles, energy storage systems, consumer electronics, and other applications. Battery safety performance and cycle life have become key factors determining market competitiveness.

As a critical internal component of lithium batteries, the separator plays an essential role in isolating the positive and negative electrodes, retaining electrolyte, and ensuring stable battery operation. However, traditional polyolefin separators have limited thermal stability and may experience thermal shrinkage, deformation, or damage under high-temperature conditions, potentially causing internal short circuits and thermal runaway risks.

Against this background, ceramic-coated separators have gradually become a standard solution for high-performance lithium batteries due to their excellent heat resistance, high mechanical strength, and low thermal shrinkage. High-purity ultrafine alumina has become the core material for ceramic separator coatings and plays a crucial role in improving battery safety.

With continuous advancements in fast-charging technologies, large-scale energy storage deployment, and consumer electronics requiring longer battery life, the quality requirements for ceramic-coated lithium battery separators continue to increase. This has driven separator coating alumina powders toward higher standards, including:

• Ultra-high purity
• Ultrafine particle size
• Narrow particle size distribution
• Excellent dispersion performance
• High sphericity

Currently, functional powders used for lithium battery ceramic separators are becoming increasingly diversified. In addition to mainstream materials such as high-purity α-alumina, nano alumina, and spherical alumina, other advanced materials including boehmite, porous alumina powders, and thermally conductive spherical silica are also expanding into new application areas.

From a market perspective, the global demand for thermal conductive and separator coating powders continues to grow steadily. Benefiting from its complete lithium battery supply chain, China has become the world's largest consumer market for fine alumina materials. Demand for high-purity ultrafine alumina, spherical alumina, and other functional powders continues to increase.

However, the preparation of high-quality separator coating powders still faces significant technical challenges. Traditional production processes struggle to simultaneously achieve high purity, precise particle size control, excellent dispersion, and high production efficiency. Some high-performance powder products still face limitations in consistency and quality stability.

Therefore, technological innovation in powder preparation processes and core manufacturing equipment has become a key driver for overcoming industry challenges and improving lithium battery safety and performance.