21700 battery

　　Research on high-end diaphragm technology for 21700 battery urgently needs a breakthrough

　　At present, the trade war initiated by the United States against "Made in China 2025" continues to ferment, and the "ZTE incident" has caused a strong shock in the industry. Recently, the United States seems to have pointed the finger at Huawei, a global communications equipment giant, again touching the pain point of China's manufacturing industry's lack of core technology. In the fierce trade war, the United States is pressing step by step and firing on multiple fronts. my country's power lithium battery industry should also guard against similar risks.

　　According to Battery China Network, there are currently more than 200 power battery manufacturers in my country, making it the country with the most power battery companies in the world. According to data, among the top 10 companies in global power battery sales in 2017, Chinese companies accounted for 7 seats. According to Forbes News Network, it is expected that by 2020, China's share of the global battery market will exceed 70%.

　　Although my country has formed a relatively complete power battery industry chain and its scale is "large" enough, it is not "strong" enough. Some key core technologies are still controlled by others, and there is a risk of being "stuck" in the ZTE style.

　　Among them, lithium battery diaphragm technology is a pain point in my country's power battery industry. Among lithium-ion battery materials, positive and negative electrode materials and electrolytes have basically been domestically produced, while diaphragms started late and domestic enterprises have low technical maturity. Although the localization rate of lithium battery diaphragms in my country has been increasing in recent years, it mainly occupies the low-end 3C battery diaphragm market, and the localization rate of high-end diaphragms is still very low. High-end 3C batteries and power battery diaphragms still rely heavily on imports.

　　According to the "Energy-Saving and New Energy Vehicle Industry Development Plan (2011-2020)" issued by the Ministry of Industry and Information Technology, by 2020, my country's production capacity of pure electric vehicles and plug-in hybrid vehicles will reach 2 million vehicles per year. Based on this estimate, the annual demand for high-quality automotive power battery diaphragm materials in my country in the future will reach hundreds of millions of square meters.

　　As we all know, in the structure of lithium batteries, diaphragms are one of the key inner components, which must prevent the positive and negative electrodes from contacting and ensure the passage of electrolyte ions. Therefore, the quality of the diaphragm will directly affect the battery's capacity, cycle and safety performance. Excellent quality diaphragms play an important role in improving the overall performance of the battery.

　　It is reported that the diaphragm is a high-value-added material with the highest technical barriers among lithium battery materials, accounting for about 15% of the cost of lithium batteries. Its technical difficulty lies in the engineering technology of pore making, matrix materials, and manufacturing equipment.

　　The common problem of domestic diaphragms at present is low consistency, which is mainly manifested in irregular defects, substandard porosity, uneven thickness, pore distribution and pore size distribution. The porosity and pore size distribution of domestic PP diaphragms stretched in one direction are close to those of foreign products; the porosity of PE diaphragms stretched in two directions and in steps is usually lower than that of foreign products, and the pore size distribution is not ideal. These problems are potential risks of the industry being "controlled by others". If they are not solved well, they may curb the healthy development of my country's lithium battery industry.

　　According to Battery China Network, the PP diaphragm of Celgard Diaphragm Co., Ltd. and the PE diaphragm of Asahi represent the highest level of products in the current diaphragm industry. Since Asahi acquired Celgard in 2016, the best diaphragm products have all come from Asahi. Several other Japanese companies, such as UBE and Toray, also have a high level. my country has a huge gap with the United States, Japan and other countries in PP diaphragm and PE diaphragm technology, and is in a passive position in the industrial chain.

　　At present, the preparation methods of lithium-ion battery diaphragms are mainly divided into wet and dry processes. my country's lithium-ion battery diaphragms have made major breakthroughs in dry processes, but in the field of wet diaphragms, domestic diaphragm companies are limited by many factors such as process and technology, and the product level is still low, and production equipment relies heavily on imports.

　　Like chips, high-end diaphragm technology has a very high threshold. Not only does it require huge investments, but it also requires a strong R&D and production team, sophisticated process technology and high-level production lines, and it cannot be achieved in a short time. However, the Sino-US trade war and the ZTE Huawei incident have sounded the alarm for my country's manufacturing industry. For the entire power battery industry, it is urgent to break through the high-end diaphragm technology of lithium batteries as soon as possible.

　　Fortunately, domestic enterprises such as Zhongke Technology and Xingyuan Materials have made major breakthroughs in high-end diaphragm technology. I believe that in the near future, my country's power lithium battery industry will be able to break the foreign technology monopoly and take the initiative in its own hands.

　　Only with a long rope in hand can you capture the blue dragon. Especially at the moment when my country's manufacturing industry is facing the "headwind" of the international economy, only by mastering core technologies can we avoid being controlled by others, avoid the "Zhongxing-style" crisis, and become the real "market king"!

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