Process flow and precautions for producing lithium-ion batteries

1. Improve the physical and chemical structure of the positive and negative active materials, which is the basic link of the lithium-ion battery production process: 1. Proper ion doping of the material; 2. Improve the particle size distribution of the active material and prevent the particle size distribution of the active material from being excessive Wide, 3. Try to use materials with disordered layered structure or 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 cycle capacity drop rate, which is The most technical process in the production process of lithium-ion batteries. For this reason, attention should be paid to: 1. The binder and solvent forming the adhesive material should be pure, and the coated pole piece should not be stored for too long. 2. Positive and negative electrode coating The ratio of the adhesive and the active material used in the mixture should be appropriate to ensure that the film does not fall off and does not fall off; third, the optimization of the electrolyte composition, the lithium-ion battery production process requires that the electrolyte is to maintain capacity and extend Battery life: 1. Improve electrolyte conductivity and reduce polarization through optimization of lithium salts, solvents and additives, 2. Inhibit the reaction between the cathode material and electrolyte, 3. By controlling the appropriate specific surface area and the carbon anode material Carry out surface treatments such as coating, film formation and surface chemical reactions to improve the surface structure of the negative electrode material; 4. After the preparation of the battery material, the lithium-ion battery production process enters the assembly process. At this time, attention should be paid to: 1. The negative electrode capacity is slightly larger Positive electrode capacity, 2. After winding the positive and negative electrodes and the separator, the particle size of the gap between the positive and negative electrodes and the separator is not more than 0.5mm, and the upper and lower deviations are not more than 0.5mm. 5. In the case of sub-volume testing, it is advisable to charge at a low rate in accordance with national standards, generally 0.2C. In general, the following proportional relationship should be paid attention to in the process and manufacturing stage: the compaction density of the pole piece surface and the pole piece, the excess rate of the negative electrode, the formulation process, the amount of electrolyte and the positive and negative electrodes. Each step of the lithium-ion battery production process has a different time. Under normal circumstances, 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, on average 5, 6 Hours. The entire lithium-ion battery production process will take 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: This can extend the life of electric vehicle batteries