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What are the advantages of Bohm stone? Application of boehmite in lithium-ion battery separator. As we all know, the demand for consumer batteries, power lithium batteries and lithium battery energy storage is increasing. Therefore, driven by market demand, the lithium separator industry, one of the key materials in lithium ion batteries, has also been growing. Recently, Xiaobian found that many battery companies and research institutions have begun to pay attention to the application of boehmite in lithium battery separators. So what are the advantages of MUSHI in lithium-ion battery separators?

What is Bohm stone

Boehmite（ γ- AlOOH) is an important component of bauxite and an important chemical raw material with unique crystal structure. It is widely used in many fields, such as catalysts and carriers, paper fillers, inorganic flame retardants, etc. Especially as a precursor, it can prepare aluminum oxide, which is widely used in ceramics, electronics, adsorption and catalysis, and has broad application prospects. At present, the preparation of inorganic nanomaterials with specific morphology has become a hot topic in the field of material science. In particular, low-dimensional nanomaterials have received more and more attention due to their special physical and chemical properties and broad application value.

In 1927, Drapalant analyzed the bauxite in Leibo, Provence, and confirmed this point γ- The ore formed by AlOOH is named boehmite. In recent years, the global output of boehmite has shown an upward trend. In 2012, the global output of boehmite was 275000 tons, the consumption was 263000 tons, and the industry market scale exceeded 500 million dollars. The European and American markets are the most important consumption areas of Boehmite in the world, accounting for 62.3% of the total global consumption in 2012, while the Asia-Pacific market is dominated by China and Japan. As the main production areas, Australia, Russia and other countries, due to insufficient domestic consumption, mainly export their products, and are important global supply markets for boehmite.

Application of boehmite in lithium-ion battery separator

Boehmite coating can significantly improve the thermal stability of the diaphragm, improve the safety of the lithium-ion battery, and improve the rate performance and cycle performance of the battery on the premise of lower coating thickness. At the same time, the thinner coating thickness helps to improve the bulk energy density and weight energy density of the lithium-ion battery. Alumina is more widely used in diaphragm. However, it is worth noting that the hardness of alumina is relatively high, so the mechanical wear is large during the cutting and coating process, and the cost is relatively high compared with that of boehmite. While boehmite has the characteristics of high heat resistance temperature, good compatibility with organic matter, low hardness can reduce the wear of machinery, and has advantages in cost.

Advantages of boehmite in lithium-ion battery separator

Advantage 1: When the current is too large, it can block the current. The lithium-ion battery diaphragm of PP/PE material is a through-hole. When the current is too high, it is easy to cause perforation, and then cause the lithium-ion battery to burn or explode. However, using high-purity alumina or boehmite as coating material and adhesive together to coat the surface of PP/PE material can play the role of pore adjustment. This is because high-purity alumina and boehmite are plate-like crystal structures. When the current is too high, the material will heat, Then the high-purity aluminum oxide or boehmite coating material with plate-like crystal structure will expand in volume and close the current conducting hole on the lithium-ion battery diaphragm, thus blocking the current. When the temperature drops, the volume of the material will shrink, and then the current conducting hole on the diaphragm will reopen. The special physical and chemical properties of the material can greatly improve the safety performance of the lithium-ion battery, Thus, it is possible to charge and discharge high-power lithium-ion batteries safely and reliably with high energy safety.

Advantage 2: The high-purity alumina or boehmite material also has excellent thermal conductivity. When the battery temperature is too high, this material can conduct heat well, thus solving the problem of poor thermal conductivity of PP/PE material.

Advantage 3: The high-purity alumina or boehmite material also has excellent flame retardancy. This is because the high-purity alumina or boehmite material itself is a very good flame retardant. Even if the temperature is too high and reaches the zero point of combustion, the good flame retardancy of the material will prevent a wide range of combustion and even explosion.

Comparison between boehmite and alumina

At present, alumina is more widely used in diaphragm. However, it is worth noting that the hardness of alumina is relatively high, so the mechanical wear is large during the cutting and coating process, and the cost is relatively high compared with that of boehmite. While boehmite has the characteristics of high heat resistance temperature, good compatibility with organic matter, low hardness can reduce the wear of machinery, and has advantages in cost.

At present, the price of China's boehmite industry tends to be stable. In the next few years, due to the impact of market competitiveness and the rise of raw materials and labor costs, the price of China's boehmite industry will maintain an upward trend. Under the temptation of "saving", it is no wonder that various battery companies have been unable to sit down, and it is no wonder that some friends have said that "the trend of boehmite replacing alumina is unstoppable".

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