Boehmite for Lithium Battery Separator Coating

 Boehmite for Lithium Battery Separator Coating

Product Introduction:

Lithium battery separator coating material boehmite has excellent insulation, chemical and electrochemical stability, heat resistance, etc. 

It could improve the thermal stability of the separator and improve the safety of lithium ion batteries at a lower coating thickness 

to improve the rate performance and cycle performance of the battery. 

Alumina is more widely used in diaphragms. But it is worth noting that the hardness of aluminum oxide is relatively large, 

so in the cutting and coating process, the wear on the machine is large, and the cost is relatively higher than that of boehmite. 

The boehmite has the characteristics of high heat resistance temperature and good compatibility with organic matter. 

The low hardness can reduce the wear on the machinery and has an advantage in cost.  

Product technical parameters and table

Advantages of boehmite in lithium battery separators:

1. When the current is too large, it can block the current. The PP / PE material lithium battery separator is a through hole. When the current is too large, it is easy to cause perforation, which may cause the lithium battery to burn or explode. High-purity alumina or boehmite is used as the coating material and binder Used together to coat the surface of PP / PE material can play the role of pore adjustment, because high-purity alumina and boehmite have a plate-like crystal structure. When the current is too large, the material heats up, and the plate-like crystal structure The high-purity alumina or boehmite coating material will expand in volume and close the current conduction hole in the lithium battery separator, thereby blocking the current. When the temperature drops, the volume of the material will shrink. The current conduction hole in the diaphragm will reopen, and the special physical and chemical properties of the material can greatly improve the safety performance of the lithium battery, thereby providing the possibility of high-energy safety and safe and reliable charging and discharging of the high-power lithium battery.

   
   

2. High-purity alumina or boehmite materials also have very good thermal conductivity. When the battery temperature is too high, this material can conduct heat well, thereby solving the problem of poor thermal conductivity of PP / PE materials. 

3.High-purity alumina or boehmite materials also have excellent flame retardancy, because high-purity alumina or boehmite materials are themselves very good flame retardants, even if the temperature is too high, it reaches zero combustion Boundary, the good flame retardant properties of this material will prevent a large-scale burning or even explosion.

Application:

1) Plate-like structure, with gaps after coating, does not affect the penetration of lithium ions and the permeability of the diaphragm.

2) It has excellent insulation, expands when the battery is working, and effectively blocks the current.

3) It has sufficient chemical and electrochemical stability and will not be corroded by the electrolyte.

4) The particle size is small and the particles are uniform, which can effectively reduce the thickness of the coating and ensure the uniformity of the thickness.

5) Excellent heat resistance, effectively improve the thermal stability of the separator when the lithium battery is working to release heat.

6) The hardness is low, reducing the wear of the coating material to the machinery.