Briefly describe the disadvantages of lithium iron phosphate batteries

Disadvantages of lithium iron phosphate batteries Whether a material has the potential for application and development, in addition to paying attention to its advantages, the more important thing is whether the material has fundamental defects. In my country, lithium iron phosphate is widely used as a negative electrode material for power lithium batteries. Government market analysts, scientific research institutions, companies, and even securities companies are optimistic about this material and believe it is the development direction of power lithium batteries. Analyzing the reasons, there are two important points: First, influenced by the research direction of the United States, the valence and the early adoption of lithium iron phosphate battery cathode materials made by A123 Company. Secondly, there is no lithium manganate material for dynamic lithium batteries with good high-temperature cycling and storage performance in China. However, lithium iron phosphate also has basic defects that cannot be ignored, which are summarized as follows: 1. In the sintering process of preparing lithium iron phosphate, iron oxide may be reduced to elemental iron at high temperature in a reducing atmosphere. Simple iron can cause micro-short circuits in batteries and is the most taboo material in batteries. This is an important reason why this material is not used as a positive electrode material for power lithium batteries in Japan. 2. Lithium iron phosphate has some performance defects, such as low vibration density and low compaction density, resulting in low energy density of lithium batteries. The low temperature performance is poor, even the nano-carbon coating does not solve this problem. Dr. Don Hillebrand, director of the Center for Energy Storage Systems at the Argonne National Laboratory in the United States, uses the word terrible to describe the low-temperature performance of lithium iron phosphate batteries. Although some manufacturers claim that lithium iron phosphate batteries can maintain their capacity well at low temperatures, this is when the discharge current is small and the cut-off voltage is low. In this case, the device cannot start at all. 3. The preparation cost of the material is higher than the manufacturing cost of the battery, resulting in low battery yield and poor consistency. While the nanofiltration and carbon coating of lithium iron phosphate improve the electrochemical performance of the material, it also brings problems such as reduced energy density, increased synthesis cost, poor electrode production performance, and harsh environmental requirements. Although the chemical elements Li, Fe, and P in lithium iron phosphate are rich in content and low in cost, the product cost of lithium iron phosphate is not low. Even if Ru0026D costs are deducted, the technical cost of materials and the cost of battery preparation will result in an increase in unit energy storage costs. 4. Poor product consistency. At present, there is no lithium iron phosphate material factory in China that can solve this problem. From the perspective of material preparation, the synthesis of lithium iron phosphate is a complex multiphase reaction, including solid phosphate, iron oxide and lithium salt, plus carbon precursors and reducing gas phase. In this complex reaction process, it is difficult to ensure the consistency of the reaction. 5. Intellectual property rights. The first patent application for lithium iron phosphate was obtained by FXMITTERMAIER u0026 SOEHNEOHG (DE) on June 25, 1993, and the result was announced on August 19, 1993. The basic patent for lithium iron phosphate is owned by the University of Texas, while the carbon coating patent is filed by Canadians. These two basic patents cannot be avoided. If a commission is included in the cost, the cost of the product will increase further. In addition, from the relevant experience in the development and processing of lithium batteries, Japan is the first country to commercialize lithium batteries and has always occupied the high-end lithium battery market. Although the United States is in a leading position in some basic research, it has not yet processed large-scale lithium batteries. Therefore, it is more reasonable for Japan to choose modified lithium manganate as the negative electrode material for power lithium batteries. Even in the United States, the proportions of lithium iron phosphate and lithium manganate as cathode materials for lithium batteries are comparable, and the federal government supports the development of these two systems. In view of the above problems, it is difficult for lithium iron phosphate to be widely used as a negative electrode material for power lithium batteries in new energy vehicles and other fields. If it can solve the problem of poor cycling and storage performance of lithium manganate at high temperatures, it will have the advantages of low cost and high multiplier performance, and it has great application potential in power lithium batteries. Disclaimer: Some pictures and content of the articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Talk about the maintenance of lithium batteries