Lithium-ion battery production analysis -Lithium - Ion Battery Equipment
Lithium battery has entered people's daily life on a large scale, but where does it come from? What are the links in the production process of lithium batteries? Although there are some differences in the production process of lithium batteries depending on different lithium battery manufacturers, due to the same principle, the main production processes of lithium batteries are basically the same, generally including: batching, coating, rolling, cutting, slitting , Welding tabs, winding, packaging, baking, liquid injection, formation, molding, volume detection and other processes.
In the necessary steps of the above-mentioned lithium battery production process, five aspects should be paid attention to from the selection of materials to the volume distribution detection after molding:
1. Improve the physical and chemical structure of the positive and negative active materials, which is the basic link of the lithium battery production process:(Lithium - Ion Battery Equipment)
1. Appropriate ion doping of the material, 2. Improve the particle size distribution of the active material, and avoid the particle size distribution of the active material from being too wide, 3. Try to use materials with disordered layered structure or thin layer structure, 4. Improve the surface structure of electrode materials;
2. The high bonding strength of the electrode coating is conducive to reducing the rate of decrease in the cycle capacity. This is the most technical process in the production process of lithium batteries. For this reason, we should pay attention 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. The ratio of the adhesive and active material used in the mixture of the positive and negative coating films should be appropriate to ensure that the coating film No powder, no powder;
3. Optimization of the composition of the electrolyte, the requirement of the lithium battery production process for the electrolyte is to maintain the capacity and prolong the battery life:
1. Improve the conductivity of the electrolyte and reduce polarization through the optimization of lithium salts, solvents and additives. 2. Inhibit the reaction between the positive electrode material and the electrolyte. 3. By controlling the appropriate specific surface area and coating the carbon negative electrode material , film formation and surface chemical reaction and other surface treatments to improve the surface structure of the negative electrode material;
4. After the preparation of battery materials, the lithium battery production process will enter the assembly process. At this time, we should pay attention to:
1. The capacity of the negative electrode is slightly larger than that of the positive electrode. 2. After winding the positive and negative electrodes and the diaphragm, the gap size between the positive and negative electrode sheets and the diaphragm is not more than 0.5mm, and the upper and lower deviation is not more than 0.5mm.
5. When dividing the capacity, it is advisable to charge at a low rate in accordance with national standards, generally 0.2C.
In general, the following proportional relationships should be paid attention to in the process manufacturing stage: the compaction density of the pole piece 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.
The time of each step in the lithium battery production process is different. Generally, the ingredients, baking, and formation take a long time, ranging from about 10 hours to two days and two nights; other processes are faster, with an average of 5 or 6 Hour. The entire lithium battery production process takes about 15 days.
In the necessary steps of the above-mentioned lithium battery production process, five aspects should be paid attention to from the selection of materials to the volume distribution detection after molding:
1. Improve the physical and chemical structure of the positive and negative active materials, which is the basic link of the lithium battery production process:(Lithium - Ion Battery Equipment)
1. Appropriate ion doping of the material, 2. Improve the particle size distribution of the active material, and avoid the particle size distribution of the active material from being too wide, 3. Try to use materials with disordered layered structure or thin layer structure, 4. Improve the surface structure of electrode materials;
2. The high bonding strength of the electrode coating is conducive to reducing the rate of decrease in the cycle capacity. This is the most technical process in the production process of lithium batteries. For this reason, we should pay attention 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. The ratio of the adhesive and active material used in the mixture of the positive and negative coating films should be appropriate to ensure that the coating film No powder, no powder;
3. Optimization of the composition of the electrolyte, the requirement of the lithium battery production process for the electrolyte is to maintain the capacity and prolong the battery life:
1. Improve the conductivity of the electrolyte and reduce polarization through the optimization of lithium salts, solvents and additives. 2. Inhibit the reaction between the positive electrode material and the electrolyte. 3. By controlling the appropriate specific surface area and coating the carbon negative electrode material , film formation and surface chemical reaction and other surface treatments to improve the surface structure of the negative electrode material;
4. After the preparation of battery materials, the lithium battery production process will enter the assembly process. At this time, we should pay attention to:
1. The capacity of the negative electrode is slightly larger than that of the positive electrode. 2. After winding the positive and negative electrodes and the diaphragm, the gap size between the positive and negative electrode sheets and the diaphragm is not more than 0.5mm, and the upper and lower deviation is not more than 0.5mm.
5. When dividing the capacity, it is advisable to charge at a low rate in accordance with national standards, generally 0.2C.
In general, the following proportional relationships should be paid attention to in the process manufacturing stage: the compaction density of the pole piece 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.
The time of each step in the lithium battery production process is different. Generally, the ingredients, baking, and formation take a long time, ranging from about 10 hours to two days and two nights; other processes are faster, with an average of 5 or 6 Hour. The entire lithium battery production process takes about 15 days.
