What effect does the content of the conductive agent have on the performance of the battery?

What effect does the conductive agent have on the charge and discharge performance of lithium iron phosphate batteries? The addition of conductive agent in the preparation process of lithium iron phosphate battery slurry is still essential. Adding a conductive agent can make it form a conductive network in LiFePO, collect micro current, reduce the contact resistance of the electrode, accelerate the migration rate of electrons, and thereby improve the charge and discharge performance of LiFePO. Lithium iron phosphate material has the advantages of low cost, good environmental compatibility, high specific capacity, and good stability, making it a positive electrode material for lithium batteries with great application potential. Due to the low conductivity of lithium iron phosphate materials, a certain amount of conductive agent needs to be added when compounding. The specific surface area of u200bu200bthe conductive agent is large and there are many particles per unit mass, which is conducive to forming a chain conductive network in the electrode, thereby improving the conductivity of the electrode. , It helps to exert the capacity of lithium iron phosphate battery and reduce the internal polarization resistance of the battery. What will the content of the conductive agent affect the battery performance? a. The purpose of the conductive agent in the electrode is to provide a channel for electrons to move. The appropriate content of the conductive agent can achieve higher discharge capacity and better cycle performance. If the content is too low, there will be fewer electronic conductive channels, which is not conducive to high current charging and discharging; If it is too high, the relative content of the active material is reduced and the battery capacity is reduced. b. The presence of conductive agent can affect the distribution of electrolyte in the lithium iron phosphate battery system. Due to the space limitation of the lithium battery, the amount of electrolyte injected is limited, generally in a state of lean, and the electrolyte is used as the battery system The distribution of the ionic body connected with the positive and negative electrodes has a vital influence on the migration and diffusion of lithium ions in the liquid phase. At present, both carbon nanotubes and graphene can be made into conductive paste, and the price is much more expensive than ordinary carbon black SP. Carbon black is a very mature conductive agent, and the price is relatively stable. As the scale effect of CNT and graphene increases in the future, there is a relatively large room for price drop, and the future application prospects are objective. C. When the content of the conductive agent reaches a turning point, too much will only reduce the electrode density and decrease the capacity, while too little will result in a low utilization rate of the active material in the electrode and a decrease in the high-rate discharge performance. 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 are the differences between UPS power supply and USB mobile power supply?