The application and advantages of Boehmite in lithium battery separators
Application of Bumite in Lithium Battery Separator
Boehmite coating can significantly improve the thermal stability of the diaphragm, enhance the safety of lithium batteries, improve the multiplier performance and cycle performance of the battery, while the thinner coating thickness helps to improve the volumetric energy density and weight energy density of lithiumion batteries at a lower coating thickness. Aluminum oxide is more widely used in the diaphragm. However, it is worth noting that the hardness of alumina is greater, so in the cutting and coating process, the wear and tear on the machinery is high, in terms of cost compared to Boehmite. Boehmite, on the other hand, is characterized by high heat resistance and good compatibility with organic materials, and its low hardness reduces wear and tear on machinery, giving it an advantage in terms of cost.
The advantages of Boehmite in lithium battery separator
1) When the current is too high, it can block the current, the PP/PE material of lithium battery diaphragm is through-hole, when the current is too high, it is easy to cause perforation phenomenon, which will cause the lithium battery to burn or explode, and the use of high-purity alumina or Boehmite as a coating material with adhesive coated on the surface of PP/PE material can play a role in regulating the hole, this is because high-purity alumina and boehmite is a plate-like. When the current is too large, the material heats up, and then the plate crystal structure of high-purity alumina or boehmite coating material will expand in volume, it will close the current conduction hole on the lithium battery diaphragm, thus playing a role in blocking the current, when the temperature drops, the volume of the material will contract, then the current conduction hole on the diaphragm will reopen, using the special physical and chemical properties of the material, can The use of the special physical and chemical properties of the material can greatly improve the safety of lithium batteries, thus providing the possibility of high power lithium batteries with high energy ampacity and safe and reliable charging and discharging.
2) High-purity alumina or boehmite material also has very good thermal conductivity, so that when the battery temperature is too high, this material can conduct heat very well, thus solving the problem of poor thermal conductivity of PP/PE material.
3)High-purity alumina or boehmite material also has excellent flame retardancy, this is because high-purity alumina or boehmite material itself is a very good flame retardant, even if the temperature is too high, reaching the combustion zero boundary point point, the material's good flame retardant properties will prevent a wide range of combustion or even explosion.
