What are the disadvantages of lithium iron phosphate power lithium ion batteries

1. During the sintering process during the preparation of lithium iron phosphate, iron oxide may be reduced to elemental iron in a high-temperature reducing atmosphere. Elemental iron can cause micro-short circuit of the battery, which is the most taboo substance in the battery. This is also an important reason why Japan has not used this material as a positive electrode material for power-type lithium batteries. 2. Lithium iron phosphate has some performance defects, such as low tap density and compaction density, resulting in low energy density of lithium batteries. The low temperature performance is poor, even if it is nanometerized and carbon coated, this problem is not solved. When Dr. Don Hillebrand, director of the Energy Storage System Center of the Argonne National Laboratory in the United States, talked about the low-temperature performance of lithium iron phosphate batteries, he described it as terrible. They declared that the lithium iron phosphate type lithium battery detection results stated that the lithium iron phosphate battery is at low temperature ( Below 0°C) It is not possible to drive an electric car. Although some manufacturers claim that the capacity retention rate of lithium iron phosphate batteries is good at low temperatures, that is when the discharge current is small and the discharge cut-off voltage is very low. In this situation, the device cannot start working at all. 3. The tap density is low. Generally, it can only reach 0.8-1.3, and the low tap density can be said to be the biggest disadvantage of lithium iron phosphate. But this shortcoming will not be prominent in power lithium-ion batteries. Therefore, lithium iron phosphate is mainly used to make power lithium-ion batteries. 4. The low temperature performance of lithium iron phosphate battery is poor. The capacity retention rate is about 60~70% at 0°C, 40~55% at -10°C, and 20~40% at -20°C. Obviously, such low temperature performance cannot meet the requirements of power supply. At present, some manufacturers have improved the low-temperature performance of lithium iron phosphate by improving the electrolyte system, improving the positive electrode formula, improving the material performance and improving the cell structure design. 4. The cost of material preparation and the manufacturing cost of the battery are relatively high, the battery yield rate is low, and the consistency is poor. Although the nanometerization and carbon coating of lithium iron phosphate improve the electrochemical performance of the material, it also brings other problems, such as a reduction in energy density, an increase in synthesis cost, poor electrode production performance, and harsh environmental requirements. Although the chemical elements Li, Fe, and P in lithium iron phosphate are abundant and the cost is low, the cost of the prepared lithium iron phosphate product is not low. Even if the previous research and development costs are removed, the process cost of the material is higher. The cost of preparing the battery will make the final unit energy storage cost higher. 5. Poor product consistency. At present, there is no lithium iron phosphate material factory in China that can handle this problem. From the perspective of material preparation, the synthesis reaction of lithium iron phosphate is a complex multiphase reaction, including solid-phase phosphate, iron oxide and lithium salt, plus carbon precursor and reducing gas phase. In this complex reaction process, it is difficult to ensure the consistency of the reaction. 6. Intellectual property issues. The earliest patent application related to lithium iron phosphate was obtained by FXMITTERMAIERu0026SOEHNEOHG (DE) on June 25, 1993, and the result of the application was announced on August 19 of the same year. The basic patent for lithium iron phosphate is owned by the University of Texas, while the carbon coating patent is applied by Canadians. These two basic patents cannot be bypassed. If royalties are included in the cost, the cost of the product will be further increased. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What matters should be paid attention to when producing lithium battery PACK