The relationship between lithium battery processing technology and fast charging

The relationship between the processing process and the fast charge is analyzed from the three key data of the positive electrode and the negative electrode, the electrode solution and other key data on its requirements and affects the fast charge, and the more influential process methods are described below. The battery manufacturing process parameters directly affect the removal resistance of lithium ions in various parts of the battery before and after the battery is activated, so the battery preparation process parameters have an important impact on the functional performance of the lithium battery. (1) On the one hand, the size is to make the conductive agent uniformly dispersed. Because the conductive agent is evenly distributed in the particles of the active material, a relatively uniform conductive network can be formed between the active material and the active material and the current collector, collecting the function of micro current, reducing the contact resistance, and improving the movement of electrons. speed. The other is to prevent excessive dispersion of conductors. During the charging and discharging process, the structure of the positive and negative data crystals will change, which may cause the stripping of the conductive agent, increase the internal resistance of the battery, and affect its function. (2) Density is one-sided. Theoretically, the multiplier battery and the large-capacity battery cannot work at the same time. When the density of the positive electrode and the negative electrode is low, the dispersion speed of lithium ions increases, and the removal resistance of ions and electrons decreases. The lower the surface density, the thinner the electrode plate. Due to the continuous insertion and ejection of lithium ions during the charging and discharging process, the structural composition of the electrode plate changes less. However, if the surface density is too low, the energy density of the battery will decrease and the cost will increase. Therefore, the demand for surface density will be promoted and considered. This is a lithium cobalt oxide battery that charges 1C at 6C. For example, see: (3) A friend has asked before the electrode film is evenly coated, does the one-sided density inconsistency affect the battery? Here I take this opportunity to talk about the function of fast charging, the most important thing is the consistency of the film. If the density of the negative surface is inconsistent, the internal porosity of the live material after rolling will be very different. The difference in porosity will cause the difference in internal current dispersion, affect the composition and function of the SEI in the battery formation stage, and ultimately affect the fast charging function of the battery. (4) Why is the plate compaction density plate compacted? One is the improvement of battery energy, and the other is the improvement of battery function. The optimal compaction density varies with electrode data. With the increase in compaction density, the smaller the porosity of the electrode sheet, the tighter the connection between particles, and the smaller the thickness of the electrode sheet under the same surface density, thereby reducing the migration path of lithium ions. When the compaction density is too high, the electrolyte penetration effect is not good, which may damage the data structure and the distribution of the conductive agent. The same lithium cobalt oxide battery is charged for 6C and discharged for 1C. The influence of compaction density on flow specific volume is shown in the following figure: 05 aging and other carbon anode batteries, aging is the key process of lithium batteries, this process will affect the quality of SEI. The uneven thickness or unstable structure of the battery will affect the fast charging capability and cycle life of the battery. In addition to the above several important factors, battery manufacturing and charging and discharging standards will also have a greater impact on the functions of lithium batteries. With the extension of the use time, the battery charging rate should be moderately reduced, otherwise it will increase polarization. Conclusion The essence of rapid charging and discharging of lithium batteries is that lithium ions can quickly detonate data between the positive and negative electrodes. The characteristics of battery data, process planning, and charging and discharging criteria all affect the high-current charging function. The structural stability of the positive and negative data is conducive to the rapid removal of lithium ions without structural collapse and damage, and the lithium ions can be dispersed faster in the information, so that they can withstand high current charging. Since the ion removal rate does not match the electron transmittance, polarization will occur during the charging and discharging process. To minimize polarization, prevent lithium metal separation, and reduce the impact on capacity statement: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Components of