Can the monopoly of lithium battery high-end diaphragm technology be broken

At present, the trade war initiated by the United States against "made in China 2025" continues to ferment, and the "zte incident" has caused strong shock in the industry. In recent days, the United States appears to be targeting huawei, the global telecommunications equipment giant, again touching a raw nerve in China's manufacturing sector over its lack of core technology. In the fierce trade war, the United States step by step, multi-line fire, China's power lithium battery industry should also beware of similar risks.

According to the battery China network understanding, at present our country power battery production enterprise already exceeded 200, is the world has the power battery enterprise most countries. Chinese companies accounted for seven of the top 10 global sales of power batteries in 2017, according to the data. China is expected to account for more than 70 percent of the global battery market by 2020, Forbes news reported.

Although China has formed a relatively complete industrial chain of power batteries, the scale is "big" enough, but it is not "strong" enough. Some key core technologies are still controlled by others, and there is a risk of zte type "stuck".

Among them, lithium battery diaphragm technology is the current power battery industry in China a pain point. In lithium ion battery materials, positive and negative electrode materials and electrolytes are basically domestically produced at present, while the diaphragm started late, and domestic enterprises are not high in technology maturity. Although the localization rate of lithium battery diaphragm in China has been increasing in recent years, it mainly occupies the low-end 3C battery diaphragm market, and the localization rate of high-end 3C battery and diaphragm for power battery is still very low.

According to the energy conservation and new energy vehicle industry development plan (2011-2020) issued by the ministry of industry and information technology, China will have a production capacity of 2 million pure electric vehicles and plug-in hybrid electric vehicles per year by 2020. According to this estimate, China's annual need for high-quality automotive power battery diaphragm material demand will reach hundreds of millions of square meters.

As we all know, in the structure of lithium battery, the diaphragm is one of the key components of the inner layer, which should not only prevent the positive and negative pole contact, but also ensure the passage of electrolyte ions. Therefore, the quality of the diaphragm will directly affect the battery capacity, circulation and safety performance and other characteristics, excellent quality of the diaphragm to improve the overall performance of the battery has an important role.

It is reported that the diaphragm is a kind of high value-added material with the highest technical barriers in the lithium electric materials at present, accounting for about 15% of the cost of lithium battery.

At present, the common problem of domestic diaphragm is not high consistency, which is mainly reflected in irregular defects, substandard porosity, uneven thickness, pore distribution and pore diameter distribution. The porosity and pore diameter distribution of domestic PP diaphragm under uniaxial tension are close to that of foreign products. The porosity of bidirectional and stepwise stretch PE diaphragm is usually lower than that of foreign products, and the pore size distribution is not ideal. These problems are potential risks for the industry to be controlled by others. If not solved properly, it may curb the healthy development of lithium electric industry in China.

According to China battery network understand, the United States Celgard diaphragm co., ltd. PP diaphragm and Asahi PE diaphragm, respectively represent the current diaphragm industry products of the highest level. Since Asahi acquired Celgard in 2016, the best diaphragm products have come from Asahi. Several other Japanese companies, such as UBE and Toray, also have high levels. China's PP diaphragm and PE diaphragm technology in the United States, Japan and other countries have a huge gap in the industrial chain in a passive position.

At present, the main preparation methods of lithium ion battery membrane are wet method and dry method. China's lithium ion battery diaphragm has made a major breakthrough in the dry process, but in the wet process diaphragm field, domestic diaphragm enterprises are limited by the process, technology and other factors, the product level is low, the production equipment depends on imports.

Like chips, high-end diaphragm technology has a rather high threshold, which requires not only a huge investment, but also a strong research and development and production team, skilled process technology and high-level production line, and can not break through in a short time. However, the sino-us trade war and the zte huawei incident have sounded the alarm bell for China's manufacturing industry. For the whole power battery industry, it is urgent to break through the high-end diaphragm technology of lithium battery as soon as possible.

Fortunately, domestic science and technology, star source materials and other enterprises in the high-end diaphragm technology has a major breakthrough. It is believed that in the near future, China's power lithium battery industry will be able to break the foreign technology monopoly, the initiative will be in their own hands.

Long tassel in hand, catch the dragon. Especially in China's manufacturing industry encountered international economic "headwinds" at the moment, only to master the core technology, will not be under the control of others, in order to avoid "zte" crisis, in order to become a real "market king"!

The page contains the contents of the machine translation.