How to increase the discharge rate of lithium iron phosphate battery?

1. Improve the quality of carbon coating. High-rate discharge makes the temperature of the LFP core body rise sharply, and the temperature rise of the coating cannot keep up, resulting in weak carbon coating and increased resistance, which affects the battery's rate discharge. 2. Ru0026D and use of dedicated cathode materials and electrolytes. The materials of the positive electrode and the electrolyte are very important, and the performance of different manufacturers is very different. 3. Improve the quality of the coating process. Speaking of the production process, the coating is still a bit technical. It is impossible to achieve the technology of foreign secondary coating and new additives in China. 4. Control the compaction density and improve the pole piece The density of compaction and the addition of AC have a great influence on improving the discharge rate of the battery. 5. Decreasing the particle size is not a method, because 1um particles and 10um frequency particles are actually the same in magnification performance. Of course, there may be a difference between 10um and 20um. If the calibration is smaller, the specific surface area may be lower. If it increases, the homogenization will have problems, and it is likely that agglomeration will not break up, and the slurry will pilling and trouble particles. The most effective way is to reduce the thickness of the electrode. At the same time, optimize the formula in the proportion, control the conductive agent, and then select the diaphragm with larger gap and the electrolyte with higher conductivity. 6. Make the pole piece thinner, the diaphragm gap is larger, the electrolyte viscosity is low, and the pole piece is thinner. Ears bigger. 7. Develop a new homogenate formula, using a small particle size cathode material. 8. Regardless of the positive or negative active material, there will be problems of expansion and contraction. Generally, the negative electrode material has a 20% expansion and contraction rate, while the positive electrode material like LFP has a 6% yield. The positive and negative active material particles have little contact with the particles, the gap is enlarged, and the base is somewhat separated from the collector, resulting in the intermittent phase of the electron and ion transmission path, which becomes a dead active material and no longer participates in the electrode reaction. Therefore, the cycle life is reduced. The VGCF carbon tube has a large aspect ratio. Even after the positive and negative active materials expand and contract, the gap between the active material particles can be bridged by the VGCF carbon tube, and the transmission of electrons and ions will not be interrupted. 9. The microstructure of the VGCF carbon tube is a hollow multi-tube wall, which allows the positive and negative electrodes to absorb a large amount of electrolyte, so that lithium ions can be inserted or deintercalated smoothly and quickly. Therefore, it is conducive to high-rate charge and discharge. 10. It is a high-strength fibrous material with a large aspect ratio, which can increase the flexibility of the electrode plate, and the adhesion between the positive or negative active material particles or the adhesion between the electrode plates is strong, and it will not be deflected And cracking off the powder. 11. VGCF is essentially of high electrical conductivity and thermal conductivity. The positive electrode active material has poor electrical conductivity. Adding VGCF can improve the electrical conductivity of the positive electrode active material, and also increase the thermal conductivity of the positive electrode or the negative electrode, which is good for heat dissipation. 12. The structural design of the battery also has a great influence. When conditions permit, the pole pieces should be made as thin as possible, and the area of u200bu200bthe positive and negative poles should be enlarged to reduce the true tangential discharge current density under high power. In addition, the design of the current collector is also very good. Importantly, reduce the polarization as much as possible, and the corresponding battery heat will be reduced, the temperature rise will be small, and the life of the bulb under high magnification will be increased accordingly. 13. The choice of negative electrode material MCMB is beneficial to rate discharge. The positive electrode should control the particle size and specific surface area. The electrolyte can be considered to have low viscosity and high conductivity, and the diaphragm can be considered to have a larger porosity and thicker, which is safer. In terms of conductive agent, you can consider using mixed conductive agent to control the content and spread evenly! As for the adhesive, water-based glue can also be considered. Relatively speaking, water-based glue has advantages over oil-based glue in terms of rate discharge. When designing the battery, you can consider thin pole pieces, multiple tabs, or change the width and position of the tabs. 14. Improve the dispersion ability, adjust the compaction solubility, select the appropriate LFP, and add an appropriate amount of PVdF. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What is the reason why BYD insists on using lithium iron phosphate batteries