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In the future, diaphragm manufacturers need to increase investment in production process improvement and matrix material research and development, so as to gradually narrow the process gap with developed countries and stand out in the tide of diaphragm localization.

On November 13-15, 2013, the International Summit Forum on Lithium New Energy Industry, known as "Davos", was held in Yichun, Jiangxi Province. Gu Chuanming, Deputy General Manager of Cangzhou Mingzhu, one of the few listed lithium battery diaphragm companies in China, made an important speech on the development status and difficulties of the industry at the first China Lithium New Energy Industry International Summit Forum, which caused waves of anxiety in the industry.

Relevant researchers pointed out that, as an important component of lithium battery charging and discharging process, the battery separator plays an important role in battery safety. Due to the high technical barrier and high gross profit rate of battery separator, the battery separator market in China has been occupied by foreign giants for a long time. According to the data, Asahi Kasei, Dongran and Celgard of the United States, currently in the first tier of diaphragm, control 74% of the global market and high-end diaphragm.

At present, China's lithium battery diaphragm industry is facing the development trend of overcapacity, lack of innovation and low price competition. First, there is a big gap between product quality and foreign countries. In terms of raw materials, both American and Japanese industry giants have their own unique production materials; In terms of equipment, the manufacturing capacity of domestic enterprises is not yet mature, while foreign enterprises block the source of equipment; In terms of technology, the investment of domestic enterprises is not strong enough to compete with that of foreign countries, and the whole production chain is inferior to that of foreign countries, which seriously restricts the development of the industry. Secondly, domestic enterprises gather in the low-end market to compete for market share by expanding production capacity and price competition, which highlights the unhealthy trend of the industry development. The data shows that the market share of diaphragm enterprises in China is only 6%, and the products are positioned in the middle and low-end markets, mainly for the low-end applications of counterfeit mobile phones, electric tools, and mobile power, with a serious squeeze on profit margins.

At the same time, in the face of the sluggish situation of the domestic diaphragm market, the policy has been increasingly inclined to the battery diaphragm industry. The Twelfth Five Year Plan for New Material Industry and the Twelfth Five Year Plan for Electronic Information Industry issued by the Ministry of Industry and Information Technology of the People's Republic of China both give support to lithium battery diaphragm as an emerging industry that focuses on supporting development. At the same time, the country vigorously promotes the development of new energy automobile industry, which gives relevant lithium battery diaphragm manufacturers development opportunities; On October 31, the Ministry of Finance publicized the list of new material R&D and industrialization projects to be supported in 2013, among which the projects involving batteries are diaphragm projects, and various measures have effectively boosted the market confidence of domestic diaphragm enterprises.

According to relevant research reports, China currently imports about 120 million square meters of diaphragm, which has decreased from 75% to about 50% in previous years. The quality level of domestic battery diaphragm is constantly improving. The development of battery diaphragm industry depends on the change of lithium battery demand. With the rapid development of electric vehicle industry in the future, the market space of domestic diaphragm products is expected to be improved. The breakthrough of domestic enterprises in production technology and equipment manufacturing capacity will create a new pattern of development of China's diaphragm industry.

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