What problems should be paid attention to in lithium battery processing technology

In the necessary steps of the lithium battery processing technology, five aspects should be paid attention to from the material selection to the volumetric test after forming: 1. The physical and chemical structure of the positive and negative active materials should be improved, which is the basic link of the lithium battery processing technology: 1. Proper ion doping of the data. 2. Improve the particle size distribution of the active data. Beware that the particle size distribution of the active data is too wide. 3. Try to use materials with a disordered layered structure or a thinner layer structure. 4. Improve the surface structure of electrode materials; 2. The high bonding strength of the electrode coating is beneficial to reduce the rate of decrease in cycle capacity. This is the most technical process in the lithium battery processing technology. For this reason, pay attention to: 1. The binder and solvent should be pure, and the coated pole pieces should not be stored for too long. 2. The ratio of the adhesive and the active material used in the positive and negative coating film mixture should be appropriate to ensure that there is no powder or no powder after coating. De-powdering; 3. Optimization of electrolyte composition. The electrolyte requirements of lithium battery processing technology are to adhere to capacity and extend battery life: 1. After optimization of lithium salt, solvents and additives, the conductivity of electrolyte is improved, and the electrode is reduced. 2. Suppress the reaction of the positive electrode material and the electrolyte. 3. After controlling the appropriate specific surface area and coating the carbon negative electrode material, film formation and surface chemical reaction, etc., the appearance of the negative electrode material is improved; After the battery materials are prepared, the lithium battery processing technology enters the assembly process. At this time, pay attention to: 1. The capacity of the negative electrode is slightly larger than the capacity of the positive electrode. 2. After winding the positive and negative electrodes and the barrier, the positive and negative plates and the barrier are formed. The gap between the particle size is not more than 0.5mm, the upper and lower deviation does not exceed 0.5mm. 5. During the sub-capacity test, it is advisable to charge at a low rate in accordance with national standards, generally 0.2C. In general, the following proportional relations should be paid attention to in the process and production stage: the compaction density of the pole piece surface and the pole piece, the excess rate of the negative electrode, the formulation process, and the appropriate amount of the electrolyte and the positive and negative electrodes. Each step in the lithium battery processing process is different. In general, the ingredients, baking, and formation time are long, ranging from about 10 hours, and more than two days and two nights; other processes are relatively fast, with an average of 5 or 6 hour. The entire lithium battery processing process takes about 15 days. 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 article: What is the reason why Tesla eliminated the mature and stable 18650 battery?