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Lithium battery separator technology has made important progress. On July 9, 2014, China Haicheng's two diaphragm technologies won national invention patents. This technology will effectively improve the safety performance of power batteries. Aetna Technology has recently obtained related patents for lithium battery cathode materials. At the same time, the “Preparation Method of Trivalent Cathode Materials Precursor†developed by Redstar has also obtained national invention patents. The above situation shows that China is continuously making technological breakthroughs in the new energy automotive industry chain.
Diaphragm and cathode materials, as the core components of lithium batteries, are intensively approved for patents and will boost the development of the industry. At present, the cost of domestic lithium battery diaphragms accounts for about 20-30% of the total cost, and the import ratio is more than 50%. The agency expects that the approval of relevant domestic patented technologies will open up the import and substitute space for the diaphragm market and also provide support for the development of electric vehicles.
It is understood that diaphragms, as one of the key raw materials for lithium batteries, have a significant impact on battery safety performance. The main function of the separator in the lithium battery is to prevent the positive and negative electrodes from short-circuiting and at the same time provide an electrical channel for ion transport during charge and discharge. Taking into account the complex factors such as raw materials, processing equipment and production processes, diaphragm production technology is relatively difficult. At present, domestic diaphragm production methods mainly include dry and wet methods. Dry diaphragm is more suitable for power batteries. In addition, in order to improve safety, power battery separators are mainly developed in the direction of high air permeability, high heat resistance, and high safety, and coating and multi-layer composite technologies will be widely used.
Driven by market demand such as new energy vehicles, the global lithium battery separator market has grown rapidly. According to statistics from CCID Consulting, the compound growth rate of the global lithium battery separator market in 2009-2013 reached 26.39%. In 2013, the global lithium battery separator market reached 837 million square meters. It is estimated that by 2015, the annual compound annual growth rate of lithium battery demand will reach 25%, and the market scale will reach 1.308 billion square meters. There are more than 30 diaphragm companies in China and the designed capacity exceeds 800 million square meters. However, in 2013, the output was only 180 million square meters, and the operating rate was relatively low. There was a lot of inefficient production capacity. It is worth mentioning that the high-end products such as the surplus of low-end products and the use of power batteries are heavily dependent on imports, and the imported diaphragm accounts for more than 50%.
The agency expects that with the support of a series of policies, the sales of new energy vehicles will usher in explosive growth and push the demand for lithium battery separators. At the same time, the approval of relevant diaphragm patents has also provided import substitution space for domestic enterprises.
In terms of the company, Fosuops Technology is a state-owned holding company in Guangdong Province and it is mainly engaged in the business of blocking new materials. The company's 32.13% stake in Jinhui Hi-Tech Co., Ltd. is a domestic leading company for lithium ion battery separators. Its 2013 capacity reached 117 million square meters, and its product quality ranks among the top international companies. The 15 million-square-meter lithium-ion battery separator project Yuntianhua has invested in successfully breaks the domestic monopoly, and it is the largest domestic production line with the highest line speed and the highest manufacturing flexibility. At the same time, the company's second phase of 15 million square meters diaphragm production capacity will be put into operation in September. Ninety-nine years also actively involved in the lithium battery industry, with electrolyte core material lithium hexafluorophosphate capacity of 700 tons, will increase to 2,000 tons after the expansion.
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