What are the advantages and basic requirements of cathode materials for lithium iron phosphate batteries

Advantages of lithium iron phosphate battery cathode materials 1. High energy density: its theoretical specific capacity is 170mAh/g, and the actual specific capacity of the product can exceed 140mAh/g (0.2C, 25C); 2. Safe and pollution-free: it is currently the safest Lithium-ion battery cathode material; does not contain any heavy metal elements harmful to the human body; complies with European RoHS regulations and is an absolute green battery certificate; 3. Long life: under 100% DOD conditions, it can be charged and discharged more than 2000 times; phosphoric acid The service life of iron-lithium-ion battery is closely related to its operating temperature. If the operating temperature is too low or too high, there will be great hidden dangers in the charging and discharging process and use process; 4. Charging performance: Lithium-ion battery with lithium iron phosphate cathode material can be used. Using high-rate charging, the battery can be fully charged within 1 hour at the fastest; 5. Light weight: The volume of the lithium iron phosphate battery of the same specification and capacity is 2/3 of the volume of the lead-acid battery, and the weight is 1/ of the lead-acid battery. 3. Lithium iron phosphate battery is currently the safest cathode material for lithium ion batteries. Although the tap density is low and the voltage platform is low, due to the safety and stability of the cathode material, it is squeezed, overcharged, and short-circuited. It is still safe under other abuse conditions. Due to its safety and stability, lithium iron phosphate batteries have become an important development direction for lithium-ion power lithium batteries. The basic requirements of the positive electrode material for lithium iron phosphate batteries First, the material itself has a high potential, so that a large potential difference can be formed between the material and the negative electrode material, resulting in a battery design with high energy density; at the same time, the charged ions are inserted and removed from the counter electrode potential. If the impact is small, the charging and discharging process will not have excessive voltage fluctuations and will not bring adverse effects to other electrical systems in the system. Second, the material contains high lithium content and the intercalation and deintercalation of lithium ions is reversible. This is a prerequisite for high capacity. Some cathode materials have a high theoretical capacity, but half of the lithium ions lose their activity after the first intercalation. Such materials cannot be put into commercial use. Third, the diffusion coefficient of lithium ions is large, the movement of lithium ions inside the material is faster, and the ability to insert and deintercalate is strong. It is a factor that affects the internal resistance of the cell and also a factor that affects the power characteristics. Fourth, the material has a large specific surface area and a large number of lithium insertion sites. The surface area is large, and the insertion channel of the lithium iron phosphate battery is relatively short, so it is easier to insert and deintercalate. While the channel is shallow, the location for lithium insertion should be sufficient. Fifth, it has good compatibility and thermal stability with lithium-ion battery electrolyte, which is due to safety considerations. The positive electrode material does not easily react with the electrolyte, and is still structurally stable at higher temperatures and still does not easily react with the electrolyte. Such a material will not supply heat for the extra heat accumulation of the battery cell, and can reduce the probability of the battery cell entering the self-heating stage. Sixth, the materials are easily available and the processing performance is good. Low cost, easy processing of materials into electrodes, and stable electrode structure are favorable conditions for the popularization and application of materials. 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 are the benefits of polymer batteries used in mobile power