What are the characteristics of spraying alumina coating on lithium battery equipment

Source：m.dqig.cn Release date： 2024年10月28日

Information summary：The spraying of alumina coating on lithium battery equipment has the following characteristics: 1. Good thermal stability: Aluminum oxide has a high melting point and can maintain stable structure and properties even in high temperature environments. During the operation of lithium batteries, a certain amount of heat is generated, especially when used in rapid charging and discharging or hi

The spraying of alumina coating on lithium battery equipment has the following characteristics:
1. Good thermal stability:
Aluminum oxide has a high melting point and can maintain stable structure and properties even in high temperature environments. During the operation of lithium batteries, a certain amount of heat is generated, especially when used in rapid charging and discharging or high-temperature environments, where the temperature may rise. Aluminum oxide coating can withstand such high temperatures, protect equipment from thermal damage, ensure normal operation of equipment, and maintain the integrity of the diaphragm above 180 ℃, which is very important for improving the safety and reliability of lithium batteries.
2. Excellent insulation performance:
Aluminum oxide is a good insulation material that can be sprayed onto lithium battery equipment to form an insulation layer, preventing short circuits between the positive and negative electrodes inside the battery. This helps to improve the safety of batteries and reduce the safety risks caused by short circuits, such as fire and explosion.
3. Higher hardness and wear resistance:
Aluminum oxide has high hardness, and the coating after spraying has good wear resistance. During the production, assembly, and use of lithium battery equipment, mechanical effects such as friction and scratching may occur. Aluminum oxide coating can effectively resist these mechanical wear, protect the equipment surface, and extend the service life of the equipment.
4. Good chemical stability:
Alumina has stable chemical properties at room temperature and pressure, and is not easily subjected to chemical reactions with the electrolyte, active substances, etc. inside the battery. This can ensure the stability of the coating's performance, without affecting the battery's performance and lifespan due to chemical reactions. At the same time, it can also neutralize free HF in the electrolyte, improving the acid resistance and safety performance of the battery.
5. Good thermal conductivity:
Although alumina itself is an insulating material, it has good thermal conductivity. During the operation of lithium batteries, the heat generated can be quickly transferred through the alumina coating, which helps to dissipate heat, reduce the temperature of the battery, and improve its performance and lifespan.
6. Special properties of nano alumina:
When aluminum oxide exists in the form of nanoscale particles, it has some special properties. Nano alumina powder has good wetting properties, can increase the bonding force with the substrate, and has certain liquid absorption and retention abilities, which can improve the electrochemical performance of lithium batteries.
7. Increase the tortuosity of micropores:
Aluminum oxide coating can increase the micro pore tortuosity of lithium battery separators, which means that the path of lithium ions through the separator becomes more tortuous. This structure can reduce the self discharge rate of the battery, improve its storage performance and cycle life.
8. Function of blocking current (under specific conditions):
When the current is too high, the aluminum oxide coating material will generate heat. When high-purity nano aluminum oxide with a plate-like crystal structure is used, its volume will expand, closing the current conduction holes on the lithium battery separator, thereby blocking the current. When the temperature drops, the volume of the material will shrink, and the conductive holes will reopen, providing additional protection for the safe use of lithium batteries.

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