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Lithium diaphragm demand will increase significantly Views [0] Published: 2017-08-31 11:27:03


Diaphragm is the lithium ion battery four materials in the technical barriers of the highest part of the preparation methods are mainly wet and dry. Its cost accounted for only after the cathode material, about 10% -14%, in some high-end batteries, accounting for even up to 20%. Diaphragm for the importance of lithium-ion battery is self-evident.


However, it is more critical that the performance of the separator determines the critical characteristics of the capacity, cycle performance, charge and discharge current density of the lithium ion battery, and thus requires a suitable thickness, ion permeability, pore size and porosity and sufficient Chemical stability, thermal stability and mechanical stability and safety properties.


Due to the high performance requirements of the diaphragm, China's diaphragm technology level is also experienced a difficult period of development. At present, the dry diaphragm has made a major breakthrough, the formation of its own technical system, the import substitution is basically completed, the mainstream dry batteries are made of domestic diaphragm.


However, in the field of wet diaphragm, the domestic diaphragm enterprises are limited by the process, technology and other factors, the product level is still low, the production equipment mainly rely on imports. At present, the high-end battery separator market is still dominated by overseas enterprises, Japan Asahi Kasei, Japan East fuel, the United States Celgard (in February 2015 by wet technology on behalf of the company Asahi Kasei acquisition, dry production, new wet production line), SKI, W -scope, Japan Ube basically formed a monopoly.


One of Japan's main production of dry Diaphragm, Japan Asahi Kasei, Toray, South Korea SK and other enterprises mainly produce wet diaphragm. Its products are high temperature, anti-extrusion performance is much higher than the domestic similar products, for the diaphragm aperture and porosity and other control technology needs to accelerate the pursuit of domestic diaphragm enterprises.


Survey data show that in 2016, the global lithium battery diaphragm production of 1.719 billion square meters, an increase of 20.92%; China lithium battery diaphragm production of 929 million square meters, an increase of 33.03%. It is expected that by 2020, the global lithium battery diaphragm production will reach 3.697 billion square meters, China's lithium battery diaphragm production will reach 2.545 billion square meters.


We can see the next three years, China's lithium separator industry will be explosive growth. As the price of wet diaphragm is more expensive, the future wet diaphragm in the power battery will still take the high-end market line, and low-end power battery will still be dry-based. But the current domestic diaphragm products are mainly used in the low-end areas, with the next operation of the production line of the diaphragm, low-end areas will usher in large cleaning, lack of technology, less brands, short-term small and medium enterprises may encounter out.


The wet membrane is the four major barriers to lithium batteries in the highest part of the current foreign enterprises in the monopoly of the high-end market, domestic enterprises want to be among the large number of efforts to improve, in the product stability, consistency of good products Rate and other aspects to further improve and work together to eliminate the replacement of lithium battery materials, the last position of the replacement. Domestic diaphragm enterprises in the wet diaphragm market before the outbreak, very early entry will occupy a favorable position in the competition.


Research data show that the future trend of thin lithium foil technology tends to be thin, coating technology will be widely used, diaphragm matrix material will be expanded in three areas.


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