Uses include:
1. Used as the main component of rubies and sapphires.
2. Used as cutting tools and grinding materials.
3. Alumina powder can be used as a support for chromatographic analysis.
4. Aluminum oxide film can prevent continuous oxidation of aluminum and can be used as a protective layer.
5. Alumina is the main component of aluminum ore.
Alumina is a white crystalline powder. Alumina is mainly used as a raw material for manufacturing aluminum metal, so it is also called foundry grade alumina (SGA). From an application perspective, 90% of the world's alumina is used for aluminum processing, and the remaining 10% is destined for non-metallurgical markets, i.e. industrial purposes.
When the purity reaches more than 99.99%, it is called high purity alumina,which has the advantages of excellent hardness, high brightness, electrical insulation, super wear resistance and high corrosion resistance. Generally, high purity 3N alumina is mainly used in advanced ceramics; 4N is mainly used in phosphors; 5N is used in sapphire crystals, lithium battery separators, advanced ceramics, semiconductor materials, etc.
Among them, alumina ceramic substrates used in 5G communication integrated circuits and high-purity alumina separators used in lithium batteries still rely on imports, while demand for domestic market continues to grow.
Detailed information:
Safety:
Ingestion: low risk, easy to cause Alzheimer's disease,harmful to children's intelligence
Inhalation: may cause irritation or lung damage
Skin: low risk
Eye: low risk
Unless otherwise noted, use SI units and standard air temperature and pressure.
Baidu Encyclopedia - Alumina
What is the difference between rubberized diaphragm and ceramic diaphragm?
Wear-resistant nano-oxidation coating Aluminum insulation, heat insulation and high temperature resistance
1: Used for coating the negative electrode of the battery;
L 'High purity nano aluminum oxide has the properties of insulation, heat insulation and high temperature resistance;
As the capacity of lithium-ion rechargeable batteries continues to increase, the The energy accumulated inside becomes greater and greater and the internal temperature increases. It is possible thatue the negative electrode separator. will melt due to excessive temperature and cause a short circuit; If the separator is covered with nano-alumina coating, it can avoid short circuit between electrodes.
Improve the safety of using lithium batteries.
VK-L30 A-phase nano-alumina has high purity, good insulation and dense coating.
Two: Lithium-ion battery materials are mixed, mainly coating;
Coating generally refers to lithium cobalt oxide, lithium manganate, lithium titanate, lithium iron phosphate, etc. The material is surface coated.
Al2O3 coating material with nanometer thickness will greatly reduce the interface resistance, provide additional electron transmission tunnel, greatly prevent the erosion of the electrode by the electrolyte and will accommodate the particulations during the Li+ deintercalation process. Volume changes to avoid damage to the electrode structure. Electrochemical tests show that the first discharge capacity, cycle performance, high temperature performance and flow performance of the sample with 0.25% coating were significantly improved. Excessive coating material will cause electrochemical performance to deteriorate. VK-L30D Y-phase nano-alumina has a large specific surface area and provides flow channels for lithium ions.
The difference between rubber coated diaphragms and ceramic diaphragms: different properties.
Diaphragm stuck. After a layer of glue is applied to the surface of the separator, the layer of glue on the surface of the separator will cover part of the gaps on the surface of the separator, thereby blocking the passagelithium ions and reducing the ionic conductivity of the separator, thereby increasing the internal resistance of the battery and causing the formation of lithium ions. Battery performance is reduced, especially with thick layers of separator glue.
Ceramic diaphragm. On the original lithium battery separator, aluminum oxide, binder and deionized water are mixed and stirred to form a suspension, and a micro-etching extrusion coating method is used to make a layer of ceramic on the base separator or one layer on each side. noodle.
The thickness is 2 to 4 microns. The ceramic separator increases the mechanical strength of the original film, and the battery has excellent performance in high temperature resistance, puncture resistance and reduced thickness. At the same time, breathability is not affected, thus improving safety.you.
Advantages of high purity oxidized saw diaphragm (VK-L30G):
1. High temperature resistance:
Oxidation. The aluminum coating has excellent high temperature resistance and can maintain the diaphragm shape above 180 degrees Celsius.
2. High safety:
Alumina coating can neutralize free ions in the electrolyte, improve the acid resistance of the battery and improve safety.
3. High rate performance:
Nano aluminum oxide can form a solid solution in the bonding battery to improve the rate capacity and cycle performance.
4. Good wettability:
Nano-alumina powder has good liquid absorption and retention capabilities.
5. Unique Self-Shutoff Features:
Maintains the closed cell characteristics of the polyolefin separator to avoid potential safety hazardsdamaged by thermal runaway.
6. Low self-discharge rate:
The alumina coating has a new micropore tortuosity, and the self-discharge is lower than that of ordinary separators.
7. Long service life:
Reduces mechanical micro-short circuits during cycling, effectively improving service life.