The product has been 7 years from the development, look, non-woven yet large-scale commercial lithium battery separator good? 

Lithium battery separator matrix materials mainly include polyolefin material and non-woven materials. Polyolefin membranes have excellent mechanical properties, chemical stability and relatively cheap characteristics, but the temperature resistance of polypropylene / polyethylene is limited and the appropriate working temperature is lower than 150. In order to further improve the ratio of energy to lithium batteries, the thickness of the film must be reduced, the liquid absorption rate of the two-dimensional pore structure is reduced, and the safety of the battery is affected again. Therefore, in order to meet the needs of high power and high power fast impulse discharge, the non-woven fabric with 3D pore structure has become a research hotspot. 

Nonwoven fabric membrane materials usually use polyethylene terephthalate (PET), polyimide (PI), aramid fiber and so on. The heat resistance is obvious. At the same time, because of its three-dimensional pore structure, it can effectively avoid short circuit phenomenon caused by Acupuncture and improve liquid retention rate. Domestic and foreign enterprises have carried out a lot of research and development on non-woven membrane separators. 
Ø　In August 2010, DuPont announced the development of polyimide diaphragm. 
Ø　In 2010, Shougang Co., Ltd. and the Institute of science and chemical technology of the Chinese Academy of Sciences formed the first division of the first division, using the polyimide nanofiber diaphragm technology developed by the Wu Dayong technical team of physicochemical Institute to implement the industrialization. The 300 thousand square meter / year middle test line was built and run in January 2012 

Ø　In March 2011, Jiangxi's first timber release plan will build an annual production base of 200 million square meters polyimide membrane. In July 2014, Jiangxi first material parent company Shenzhen Hui Cheng semi annual report showed that the equipment installation project of the polyimide diaphragm production line was 8.20%, and the total amount of actual input was 5 million 910 thousand yuan. 

Ø　In February 2012, in Japan, a thin lithium electroless separator made from polyolefin non-woven fabric and PVA (polyvinyl alcohol) nanofiber was displayed on paper made in Guangzhou. 

Ø　In 2013, the Zhejiang great Southeast Limited by Share Ltd signed an agreement with the Institute of chemistry of the Chinese Academy of Sciences to develop an electrostatic spinning method for the preparation of lithium nanofiber membranes, and to produce pilot production in 2015. 

Ø　O Evonik Degussa in PET non-woven coated ceramic materials for lithium battery separator

Ø　On 2016CIBF, Codbo demonstrated the battery that ceramic coated PET non-woven fabric diaphragm. Codbo said that because the product could be produced at higher temperatures, the drying process and the electrolyte impregnation process were accelerated, and the preparation process of the cell unit was shortened.

Ø　Japan's special East China Sea paper says that the technology of cellulose diaphragm material has been developed.

Ø　Dreamweaver has developed a non-woven fabric separator based on nano and micron cellulose.

Ø　Porous Power Technology developed PET diaphragm filled with PVDF and Al2O3.

The Japanese princes paper is made of wet nonwoven substrate by paper making method, and PU, PET or PTFE resin is coated on the substrate. 

Ø　MITSUBISHI made paper and Tokyo Polytechnic University developed PET non-woven fabric diaphragm technology. 

Ø　O Mick Ningbo Aite lithium Technology Co. company launched a nano fiber membrane with closed cell characteristics 

Ø　The joint venture between Dongli and Dong Chemical Co has developed a micro porous aramid film with aramid resin as the base material, which is excellent in heat resistance and dimensional stability. 

Ø　The emperor of Japan (Teijin) announced on February 2012 that developed for aramid fiber membrane laminated polymer lithium ion battery 

All of the above look good non-woven fabric lithium separator, they have one thing in common, they are not large-scale commercial applications. Suburbanization believes that the most important reason is price. The cost of non-woven fabric diaphragm is usually above 10 yuan / square meter, while the price of middle and high grade membrane after coating is about 5-6 yuan. In the lithium battery cost control more stringent industry trends, the lack of price competitive advantages of nonwoven. Besides, there are several factors that affect the popularization and application of non-woven fabric diaphragm. 

1., the general tensile strength of non-woven fabric diaphragm is low, so it is difficult to be applied to high speed winding process. The laminated process has relatively low strength requirement for diaphragm tension, and the non-woven fabric diaphragm is more suitable for laminated process. 

2. the diameter of the diaphragm is larger and the larger aperture brings excellent multiplier performance, but it also causes the battery's self discharge, and has a potential impact on the high temperature and storage performance. 

3., the application of non-woven fabric diaphragm requires that the existing lithium battery production process be changed, and diaphragm cutting, baking temperature and liquid volume should be adjusted. 

So, if there is no non-woven lithium battery separator development prospects? ASIACHEM considers that not all. The reasons are as follows. 

1., three yuan cathode material, large power lithium battery is an important development trend of new energy vehicle power source, and its safety is particularly concerned. On the large three element power lithium electric power produced by the stacked process, the nonwoven membrane has advantages over the polyolefin diaphragm in the safety, multiplying performance and service life. In the future, with the development of power lithium industry and the further improvement of diaphragm performance, the non-woven fabric membrane can occupy a place. 

2., with the increase of production, the cost of non-woven fabric diaphragm is decreasing. 

2016 lithium battery separator and electrolyte seminar will be held in Shandong Qingdao in September 8th. The conference will discuss the development trend of lithium electric power in China and the market potential of key materials, the direction of lithium electric technology and the demand for the performance of the diaphragm and electrolyte, the investment and production prospect of the key materials for lithium battery, the upgrading of the diaphragm manufacturing process and quality control, the optimization of the electrolyte performance and the development of the new technology. (the above is from the Polaris power network)