Lithium battery separator
2023-07-03 03:08:26
In the structure of a lithium battery, the diaphragm is one of the key inner layer components. The performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. The separator with excellent performance plays an important role in improving the overall performance of the battery. The main function of the separator is to separate the positive and negative electrodes of the battery, prevent the two poles from contacting and short-circuit, and also have the function of allowing electrolyte ions to pass. The separator material is non-conductive, and its physicochemical properties have a great influence on the performance of the battery. The type of battery is different and the diaphragm used is different. In the lithium battery series, since the electrolytic solution is an organic solvent system, a separator material resistant to an organic solvent is required, and a polyolefin porous film having a high strength thin film is generally used.
development of
The most developed countries in the lithium battery separator industry worldwide are Japan and the United States. According to the incomplete statistics of the real lithium research, in 2011, the global sales of lithium battery separators was about 358 million m2, and the production and sales of diaphragm materials in Japan**, in 2011, sales totaled about 241 million m2, accounting for more than half of the global market share. 52.62%, representative companies include Asahi, Tonen (a subsidiary of Dongxun General Petroleum of ExxonMobil), UBE, Sumitomo Chemical Mitsubishi Chemical (MCC), Nitto Denko, etc.; the United States is second only to Japan. In 2011, it sold about 111 million m2 of lithium battery separator materials, accounting for 24.24%. The main companies are Celgard (United States Polypore Group (NYSE) :PPO), Entek, etc.
In 2011, Korean companies sold a total of 36 million m2 of lithium-ion battery separators, accounting for 7.86% of the world. The main manufacturers are SK Innovation (SK Innovation, reorganized from the former SK Energy, a subsidiary of the South Korean SK Group), in addition, W- Companies such as Scope and WIDE also have a small amount of production and sales. Other regions mainly refer to Europe and Taiwan, including Evonik Degussa and Gaoyin Chemical Industry Co., Ltd., and the current sales in these regions are still small. Among them, Evonik's Litarion Company produces LITARION® nickel-cobalt-manganate materials (commonly known as ternary materials) and SEPARION® ceramic battery separators that can greatly improve the energy efficiency and safety performance of power lithium batteries, already in the German auto giant. Daimler-Benz's electric vehicles are being tested on a larger scale. In addition, N-Tech in the UK and DSM Group in the Netherlands are also actively developing lithium battery separator materials.
Since the performance of the diaphragm directly affects the internal resistance, discharge capacity, cycle life and safety of the battery, the lithium battery manufacturing has extremely high requirements for the consistency of the diaphragm material, except for thickness, surface density and mechanical properties. In addition to the basic requirements, the uniformity of the size and distribution of the membrane pores is also very high. Therefore, in view of the difficulty of the technical process, the diaphragm material is one of the key materials for lithium batteries in China that have not yet achieved self-sufficiency. However, since Xinxiang Gryen took the lead in realizing the localization of diaphragm materials in 2004, China's diaphragm material industry has developed very fast, and domestic diaphragms have rapidly and scaledly replaced imported products in the low-end and mid-end markets.
According to statistics, in 2011, Chinese companies achieved a total sales volume of about 67 million m2, accounting for 14.63% of the global market, ranking third in the world. In the same year, the sales of lithium batteries in China's local enterprises accounted for 25% of the world's total. In this way, China's domestic lithium battery companies have a diaphragm demand of about 114.5 million m2 in 2011. Thus, in 2011, China's diaphragm self-sufficiency rate has exceeded half, reaching 58.52%, much higher than the data given by most research institutions. At this rate, it will take a few years for China's diaphragm materials to achieve self-sufficiency. Moreover, some well-known lithium-ion battery companies in Japan and South Korea are already considering purchasing diaphragm materials produced by Chinese companies. This explains to a certain extent that the diaphragm industrialization technology of Chinese companies has reached the desired level.
In terms of sales volume of enterprises, more than 85% of China's diaphragm material sales in 2011 were formed by Xinxiang Gryan (Green, Jinlong Copper Tube Group) and Foshan Jinhui Hike (Jinhui), a joint venture between Foshan Plastics and BYD. At present, BYD has withdrawn, and Foshan has lost its status as a major shareholder. It is gradually being marginalized. Hong Kong 100 Industry has become the controlling shareholder of Jinhui Hi-Tech and Shenzhen Star Materials (Senior).
development of
The most developed countries in the lithium battery separator industry worldwide are Japan and the United States. According to the incomplete statistics of the real lithium research, in 2011, the global sales of lithium battery separators was about 358 million m2, and the production and sales of diaphragm materials in Japan**, in 2011, sales totaled about 241 million m2, accounting for more than half of the global market share. 52.62%, representative companies include Asahi, Tonen (a subsidiary of Dongxun General Petroleum of ExxonMobil), UBE, Sumitomo Chemical Mitsubishi Chemical (MCC), Nitto Denko, etc.; the United States is second only to Japan. In 2011, it sold about 111 million m2 of lithium battery separator materials, accounting for 24.24%. The main companies are Celgard (United States Polypore Group (NYSE) :PPO), Entek, etc.
In 2011, Korean companies sold a total of 36 million m2 of lithium-ion battery separators, accounting for 7.86% of the world. The main manufacturers are SK Innovation (SK Innovation, reorganized from the former SK Energy, a subsidiary of the South Korean SK Group), in addition, W- Companies such as Scope and WIDE also have a small amount of production and sales. Other regions mainly refer to Europe and Taiwan, including Evonik Degussa and Gaoyin Chemical Industry Co., Ltd., and the current sales in these regions are still small. Among them, Evonik's Litarion Company produces LITARION® nickel-cobalt-manganate materials (commonly known as ternary materials) and SEPARION® ceramic battery separators that can greatly improve the energy efficiency and safety performance of power lithium batteries, already in the German auto giant. Daimler-Benz's electric vehicles are being tested on a larger scale. In addition, N-Tech in the UK and DSM Group in the Netherlands are also actively developing lithium battery separator materials.
Since the performance of the diaphragm directly affects the internal resistance, discharge capacity, cycle life and safety of the battery, the lithium battery manufacturing has extremely high requirements for the consistency of the diaphragm material, except for thickness, surface density and mechanical properties. In addition to the basic requirements, the uniformity of the size and distribution of the membrane pores is also very high. Therefore, in view of the difficulty of the technical process, the diaphragm material is one of the key materials for lithium batteries in China that have not yet achieved self-sufficiency. However, since Xinxiang Gryen took the lead in realizing the localization of diaphragm materials in 2004, China's diaphragm material industry has developed very fast, and domestic diaphragms have rapidly and scaledly replaced imported products in the low-end and mid-end markets.
According to statistics, in 2011, Chinese companies achieved a total sales volume of about 67 million m2, accounting for 14.63% of the global market, ranking third in the world. In the same year, the sales of lithium batteries in China's local enterprises accounted for 25% of the world's total. In this way, China's domestic lithium battery companies have a diaphragm demand of about 114.5 million m2 in 2011. Thus, in 2011, China's diaphragm self-sufficiency rate has exceeded half, reaching 58.52%, much higher than the data given by most research institutions. At this rate, it will take a few years for China's diaphragm materials to achieve self-sufficiency. Moreover, some well-known lithium-ion battery companies in Japan and South Korea are already considering purchasing diaphragm materials produced by Chinese companies. This explains to a certain extent that the diaphragm industrialization technology of Chinese companies has reached the desired level.
In terms of sales volume of enterprises, more than 85% of China's diaphragm material sales in 2011 were formed by Xinxiang Gryan (Green, Jinlong Copper Tube Group) and Foshan Jinhui Hike (Jinhui), a joint venture between Foshan Plastics and BYD. At present, BYD has withdrawn, and Foshan has lost its status as a major shareholder. It is gradually being marginalized. Hong Kong 100 Industry has become the controlling shareholder of Jinhui Hi-Tech and Shenzhen Star Materials (Senior).
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