What are the advantages of using high-purity alumina in the coating technology of lithium battery separators? High-purity alumina is widely used in our daily life, such as in the lithium batteries we commonly use, which is mainly reflected in the coating technology of lithium batteries. This article introduces the relevant content.
One, safety performance
When the current is excessive, it can interrupt the flow. The lithium battery separator made of PP/PE materials has through-holes. Excessive current is particularly prone to piercing, which could lead to battery combustion and explosion. When high-purity alumina is used as a coating material and applied with an adhesive to the surface of PP/PE materials, it effectively acts as an intermediary. This is primarily due to the plate-like crystal structure of high-purity alumina, which expands upon encountering high current, sealing the through-holes on the lithium battery separator and thereby blocking the current. As the temperature drops and the material shrinks, the current conduction holes in the barrier membrane reopen. By utilizing the unique physical and chemical properties of high-purity alumina, the safety and performance of lithium batteries can be significantly improved, thereby making it possible for high-power lithium batteries to charge and discharge safely and reliably, and to achieve high-energy safety.
Second, thermal conductivity
It boasts excellent thermal conductivity. When the battery temperature is too high, this material can effectively dissipate heat, thus resolving the issue of poor thermal conductivity in PP/PE materials.
Three, flame retardancy
Materials containing high-purity alumina possess flame-retardant properties, primarily because high-purity alumina itself is an excellent flame-retardant, even reaching the zero boundary point of combustion at certain temperatures. Battery separator alumina, materials with high-purity alumina, exhibit good flame-retardant characteristics, thus preventing widespread fires or explosions.
