Lithium iron phosphate battery plays an indispensable role in the development of new energy industry

by:CTECHi     2021-07-26

New energy vehicles, solar and wind energy grid-connected frequency modulation energy storage power stations, mobile communication base stations, electric logistics vehicles... In the development wave of the new energy industry, power batteries play a pivotal role. With the development of emerging industries such as new energy vehicles, renewable energy and smart grids, the research and development of power lithium batteries has become the research frontier. Among them, lithium iron phosphate has the advantages of high safety, long cycle life and stable capacity, and can use abundant and cheap iron and phosphorus resources without using non-ferrous metals such as cobalt and nickel. It is an internationally recognized sustainable power lithium battery. Cathode material. Since 2004, the team of Professor Ma Zifeng from the School of Chemistry and Chemical Engineering of Shanghai Jiaotong University has joined BYD Co., Ltd. (hereinafter referred to as BYD), Sinopoly Battery Co., Ltd., Jiangsu Leneng Battery Co., Ltd. (hereinafter referred to as Jiangsu Leneng), Shanghai Paineng Energy After 15 years of hard work, companies such as Science and Technology Co., Ltd. have built a lithium iron phosphate power battery technology system with independent intellectual property rights, which has been widely used in new energy vehicles and energy storage engineering systems. The 'Key Technology of Lithium Iron Phosphate Power Battery Manufacturing and Its Application Process' completed by the team in cooperation with BYD and other units won the second prize of the 2018 National Science and Technology Progress Award. From new synthesis reaction design to 10,000-ton production in 1996, lithium iron phosphate was used in power lithium battery research. However, to realize the large-scale application of lithium iron phosphate, a manufacturing process and equipment with a ton-level production capacity must be established. Ma Zifeng and others analyzed the synthesis processes of many well-known international companies and found that these reaction processes will produce harmful gases such as carbon monoxide and ammonia, and the sintering time is long and energy consumption is high. In order to reduce production costs and reduce pollution in the production process, the team proposed a new synthesis reaction of lithium iron phosphate and prepared a new structure of positive electrode material. In 2004, Professor Ma Zifeng’s team carried a new method and cooperated with Hengdian Group East Magnetic Co., Ltd. to develop lithium iron phosphate cathode materials. The project was funded by the Zhejiang Provincial Science and Technology Achievement Transformation Project in 2006, and built a 300 tons/year full-process lithium iron phosphate pilot line, and cooperated with Shanghai Delangen Battery Company to develop lithium iron phosphate batteries for electric vehicles. The construction of large-scale production lines has laid a good foundation. In 2007, as the chief scientist, Ma Zifeng presided over the National 973 Program 'Research on Basic Scientific Issues of Low-cost, High-density Storage Systems for Electric VehiclesShanghai Jiaotong University has cooperated with Tsinghua University, Fudan University, Xiamen University and other units to carry out research and development of lithium iron phosphate materials and their application technologies with BYD and other companies. Since then, Ma Zifeng's team has cooperated with BYD to carry out research on key technologies for low-cost lithium iron phosphate battery energy storage systems, and expand the application field of lithium iron phosphate batteries from new energy vehicles to smart grid energy storage systems. In 2012, Shanghai Jiaotong University transferred the patent for the new lithium iron phosphate synthesis technology invented by Ma Zifeng and others as a whole, established the Sinopoly Battery Research Institute, carried out the large-scale promotion of lithium iron phosphate battery technology, and successively authorized and licensed many enterprises to implement the application, and A batch of new patented technologies have been developed. In 2014, under the special funding of Jiangsu Enterprise Innovation and Achievement Transformation, Ma Zifeng served as the chief expert to build a 25,600 tons/year nano-lithium iron phosphate production line in Jiangsu Leneng. The products are used in BYD and Ningde Times New Energy Technology Co., Ltd. The company and many other well-known battery companies. The scientific and technological achievement appraisal committee composed of industry experts unanimously agreed that the research results of Ma Zifeng's team have important innovations in material synthesis theory, technology and battery design. The proposed synthesis of elemental iron atom economic lithium iron phosphate is an international initiative. To become the world's largest country in manufacturing and application, to manufacture power batteries with excellent performance, not only excellent cathode materials, but also the chemical system of battery materials need to be optimized, and suitable anode materials and electrolytes need to be found. In addition, the power battery manufacturing process technology is also very important for improving battery performance. Ma Zifeng’s team invented a coating solution configuration and coating method, proposed the corresponding process, optimized the technical parameters, and formed an ultra-high rate, ultra-long cycle life nano lithium iron phosphate power battery and its new manufacturing method , And solve the problem of low temperature cold start and high rate of lithium iron phosphate battery. In 2015, the Ru0026D team cooperated with Jiangsu Zhongxing Paineng Battery Co., Ltd. to develop and industrialize low-temperature high-rate lithium iron phosphate power batteries, which are widely used in mobile communication base stations. How much power is left in the power battery system directly affects the car's cruising range. The amount of power of the battery can be described by the battery state of charge (SOC). SOC is a complex dynamic change process, which is closely related to the operating temperature of the battery system and the charging and discharging speed. Ma Zifeng’s team has developed a new SOC estimation model. Compared with international advanced indicators, the model’s estimation accuracy of battery health has increased by about 5 percentage points to 97%. In addition, the team also cooperated with BYD to develop a SOC estimation model based on rolling time domain optimization, which further improved the SOC estimation accuracy to 99%. After 15 years of industry-university-research cooperation, China has become the world's largest country in the manufacture and application of lithium iron phosphate batteries. Lithium iron phosphate power batteries have been widely used in electric buses, electric logistics vehicles, and passenger cars. The powered electric buses are also exported to the United States, Japan, the United Kingdom, Europe and Oceania.

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