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The progress of human society cannot be separated from the efforts of various industries in society, and the upgrading of various electronic products cannot be separated from the efforts of our designers. In fact, many people do not understand the composition of electronic products, such as lithium-ion battery separators.

Lithium ion battery separator technology is currently a pain point in China's power lithium-ion battery industry. In lithium-ion battery materials, the positive and negative electrode materials and electrolytes have basically reached domestic production, but the separator started relatively late and the technological maturity of domestic companies is not high. Although the localization rate of lithium-ion battery separators in China has been increasing in recent years, it is important to occupy the low-end 3C battery separator market. The positioning rate of high-end partitions is still very low. High end 3C batteries and power lithium-ion batteries still have a large number of separators. Relying on imports.

As is well known, the separator is one of the key inner components in the structure of lithium-ion batteries, which not only prevents positive and negative electrode contact, but also ensures the passage of electrolyte ions. Therefore, the quality of the separator will directly affect the capacity, cycling, and safety performance of the battery. Excellent quality separators have important applications in improving the overall performance of the battery.

The common problem in current household membranes is the lack of consistency, mainly manifested as irregular defects, unqualified porosity, uneven thickness, pore distribution and pore size distribution. In terms of porosity and pore size distribution, domestically produced PP membranes subjected to uniaxial stretching are relatively similar to foreign products. The porosity of biaxially stretched pE membranes is usually lower than that of foreign products, and the pore size distribution is also not ideal. These issues are potential risks for the industry to be 'subject to others'. If it cannot be solved, it may limit the healthy development of China's lithium-ion battery industry.

The separator is one of the key components of lithium-ion batteries, and the important material of the separator is a porous polymer film, including polyethylene and polypropylene. The separators used in lithium-ion batteries have strict requirements for safety, permeability, porosity, and thickness.

The common problem in current household diaphragms is inconsistency, which is mainly manifested as irregular defects, unqualified pores, uneven thickness, pore distribution and aperture distribution. In terms of porosity and pore size distribution, domestically produced PP membranes subjected to uniaxial stretching are relatively similar to foreign products. The porosity of biaxially stretched pE membranes is usually lower than that of foreign products, and the pore size distribution is also not ideal. These issues are potential risks faced by the industry. If it cannot be solved, it may limit the healthy development of China's lithium-ion battery industry.

Inside a lithium-ion battery, charged ions flow between the positive and negative electrodes to form an electric current. The separator is located between the positive and negative electrodes inside the battery, which not only prevents direct contact between the positive and negative electrodes, but also ensures the smooth passage of electrolyte ions. Lithium ion battery electrolytes are like a river, and lithium ions are like a boat sailing on the river. The diaphragm is a dam that surrounds the waist. Each membrane hole is like a gate on the dam. Under normal circumstances, ions will move freely to the positive and negative electrodes. Charge discharge cycle.

At present, the preparation methods of lithium-ion battery separators are mainly divided into wet and dry methods. China has made significant breakthroughs in dry process technology for lithium-ion battery separators. However, in the field of wet process separators, domestic separator companies are limited by various factors such as process and technology, and their product level is still relatively low. Their production equipment heavily relies on imports.

Like chips, high-end diaphragm technology also has a high threshold. It not only requires huge investment, but also a strong R&D and production team, proficient process technology, and high-level production lines, and it will not be able to break through in the short term. However, the China US trade war and the ZTE Huawei incident have sounded the alarm for China's manufacturing industry. It is urgent to break through the high-end lithium-ion battery separator technology as soon as possible in the entire power lithium battery industry.

High end lithium-ion battery separator technology has a high threshold. It not only requires huge investment, but also a strong R&D and production team, proficient technology, and high-level production lines, and it needs to achieve breakthroughs in a short period of time. However, the China US trade war and the ZTE Huawei incident have sounded the alarm for China's manufacturing industry. For the entire lithium-ion battery industry, it is urgent to break through the high-end lithium-ion battery separator technology as soon as possible.

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