Pseudo-boehmite is a kind of incompletely crystallized hydrated aluminium oxide. Traditionally, it is regarded as an important raw material for hydrogenation catalysts and catalytic cracking catalysts in the petrochemical industry. However, with the advancement of materials science, high-purity pseudo-boehmite has found a new application in the field of new energy - as a coating for lithium battery ceramic separators.
Four core functions: How does pseudo-boehmite safeguard battery safety?
1. Enhanced thermal stability: Preventing separator thermal shrinkage
Pure polyolefin separators have poor thermal stability and typically start to shrink at around 120°C to 150°C, leading to contact between the positive and negative electrodes and causing internal short circuits - one of the main triggers of battery thermal runaway. Pseudo-boehmite coatings have excellent high-temperature stability and can significantly inhibit the thermal shrinkage of the separator at high temperatures. Research shows that separators coated with pseudo-boehmite can maintain their complete dimensional structure at 200°C, greatly enhancing the battery's thermal safety.
2. Electrolyte wettability: Improving battery rate performance
Pseudo-boehmite has a large specific surface area and abundant pore volume. This porous structure exhibits good affinity for the electrolyte, effectively enhancing the separator's ability to adsorb and retain the electrolyte. The improvement in wettability means reduced resistance to lithium-ion transport between the positive and negative electrodes, thereby improving the battery's rate performance and cycle life.
3. Mechanical strength enhancement: Improving puncture resistance
During battery charging and discharging, lithium dendrites may form, or the battery may be subjected to external compression or puncture, all of which can pierce the separator and cause short circuits. The pseudo-boehmite coating, acting as a ceramic reinforcing layer, can significantly enhance the mechanical strength and puncture resistance of the separator, adding a physical protective barrier to the battery.
4. Chemical stability:
Pseudo-boehmite has a certain degree of chemical reactivity and can react with HF, neutralizing harmful substances and protecting the electrodes, thereby enhancing the battery's cycle stability and safety.
Today, as new energy vehicles strive for higher safety and longer range, hydrotalcite is transforming from the traditional petrochemical catalyst carrier to a key functional material that safeguards the safety of lithium batteries. If you have any questions or requirements regarding Pseudo-boehmite, please feel free to contact Zibo Xiangrun Environmental Engineering Co., Ltd. - a professional manufacturer of alumina.
