L822 battery.Advantages of lithium batteries

　　Currently, the energy density of lithium batteries is low. Firstly, the energy density is low, the vehicle is heavier, and the space is also small. It is necessary to discover new materials for batteries. Secondly, the battery life is poor. Those who claim to have a life span of over 100 kilometers refer to the ideal state, while the actual road life is around 60 kilometers. In congested cities like Beijing, 60 kilometers is not enough. The third issue is poor safety, which is still controversial because the materials used for batteries are unstable and indeed prone to explosions.

　　Lithium battery negative electrode materials grasp the lifeline of power battery safety. In lithium-ion battery negative electrode materials, in addition to a small market share of graphitized mesophase carbon microspheres (MCMB), amorphous carbon, silicon or tin, natural graphite and artificial graphite account for over 90% of the negative electrode material market share. According to the 2011 negative electrode material market statistics, the global total production and application of negative electrode materials reached 32000 tons, an increase of 28% compared to the same period last year. Both natural graphite and artificial graphite negative electrode materials accounted for 89% of the market share. However, with the growth of electronic products in recent years, especially the application of lithium-ion batteries in the field of mobile phones and tablets, the production capacity of corresponding battery positive and negative electrode materials has rapidly increased in recent years, The growth rate of graphite negative electrode materials has reached over 25% for three consecutive years from 2009 to 2011.

　　In 2013, the global demand for diaphragms reached 563 million square meters, 1.41 times the market capacity in 2011, with a production value of approximately 1.7 billion US dollars. The domestic isolation membrane market demand was approximately 128 million square meters in 2011. China's lithium battery products have accounted for about 30% of the global market share. The demand for isolation membranes in the domestic market is growing in sync with the lithium battery market.

　　At present, 80% of the domestic use of isolation membranes relies on imports, and there is still a lot of room for demand for domestically produced isolation membranes. The proportion of domestically produced isolation membranes in the domestic market will rapidly increase. In 2013, the share of domestically produced isolation membranes in the domestic market is expected to exceed 30%, and in 2015, it will exceed 40%.

　　Overall, the development direction of lithium-ion battery cathode materials is lithium iron phosphate. Although the research and development of lithium iron phosphate cathode materials in China is in full swing, there is a lack of original innovative technology. There are two future development directions for negative electrode materials for lithium-ion batteries - lithium titanate materials and silicon based materials. The silicon based materials developed in China in recent years can basically meet the requirements of high specific capacity, high power characteristics, and long cycle life, but industrialization still needs to break through the constraints of process, cost, and environment. China has made certain achievements in the localization of lithium-ion battery separators, but there is still a long way to go to achieve large-scale production of high-end products. Lithium hexafluorophosphate has an absolute market advantage in lithium-ion battery electrolytes, but China is basically constrained by Japanese technology and has weak independent research and development capabilities.

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