What is a lithium battery pre -lithium? Lithium battery pre -lithium technology explanation -Lithium - Ion Battery Equipment
Important method of pre -lithium
1. The negative electrode advancement method
Let the negative electrode become separate into it, and then assemble it with the positive pole after the negative electrode is formed to prevent the loss of the positive lithium ion and greatly improve the first efficiency and capacity of the battery. The advantage of this pre -lithium method is that it can simulate the normalization of normalization into the process, while ensuring that the formation of the SEI membrane is similar to that of lithium ion batteries, but the prematureization of the negative chip into the two processes of the presence of positive and negative chips, the operation is more difficult to operate, the operation is more difficult to big.(Lithium - Ion Battery Equipment)
2. Negative spraying lithium powder method
Make a stable metal lithium powder particles, the inner layer of the particles is metal lithium, and the outer layer is a protective layer with a good lithium ion drive rate and electronic conductivity. In the organic solvent, spray the decentralized body on the negative chin, and then dry the residual organic solvents on the negative chip, so that the pre -lithium negative chip is completed.
When it turns into it, the lithium powder sprayed on the negative electrode will consume the formation of the SEI membrane, so as to maximize the lithium ion dewang from the positive electrode and increase the capacity of the lithium ion battery. It is more difficult to ensure that the cost of materials and equipment is high.
3. The three -layer electrode method of the negative electrode
Compared with the normal copper foil, the copper foil of the three -layer electrode method is coated with the metal lithium powder that it will be transformed into the later stage. In order to protect the lithium powder does not respond to the air, it is also applied to a protective layer. On the layer.
When the battery is completed, the protective layer will be dissolved in the electrolyte, so that the metal lithium is in contact with the negative electrode, and the lithium ion consumed by the SEI membrane when it is turned into a metal lithium powder. This method is processed by the lithium ion battery plant The conditions do not have harsh requirements, but the stability of the protective layer in the polar section, rolling, cutting and other stations is a great challenge to the development of electrode materials. It's quite difficult.
4, Zhengzheng Lithium Material Method Method
When the first effect of the negative pole is lower than the positive electrode, there will be too much lithium ion loss in the negative electrode when it is turned into the negative electrode, which causes the positive effective space of the positive electrode after the discharge to be welcomed by the lithium ion, forming a waste of the positive embedded lithium space; if a small amount is added to the positive electrode The high -grade capacity is lithium -rich material, so that it can supply more lithium ions for the formation of the SEI membrane when it turns into the formation of the SEI membrane, and there is no need to worry that the lithium -rich material cannot be embedded again when discharge.
Second, lithium -ion battery pre -lithium technology
The common pre -lithium method is negative electrode lithium, such as lithium foil and lithium supplementation, lithium powder supplementation, etc., which are currently a pre -lithium technology that is currently developing. Lithium technology.
1. Lithium foil nourishing lithium
Lithium foil supplementation is a technology that uses self -mounted motors to supplement lithium. The potential of the metal lithium is the lowest among all electrode materials. Due to the poor potential, when the negative electrode material is in contact with the metal lithium foil, the electron moves spontaneously to the negative electrode, accompanied by the embedding of li+in the negative electrode.
2. Stable lithium metal powder (SLMP)
Compared with the addition of adding during the slurry process, SLMP is easier and easy to load directly to the dry electrode surface of dry. Use SLMP to pre-lithium silicon-carbon nanotuba, drip the mass score of 3%SLMP/toluene solution on the surface of the negative surface of the silicon-carbon nanot barrel. Later, the first irreversible capacity of the negative electrode decreased by 20%to 40%.
3. Silicized lithium powder
The size of nano -silicon lithium powder is very small, which is more conducive to the dispersion in the negative electrode; in addition, it is already expanding, and the volume change during the cycle will not affect the structure of the entire electrode.
1. The negative electrode advancement method
Let the negative electrode become separate into it, and then assemble it with the positive pole after the negative electrode is formed to prevent the loss of the positive lithium ion and greatly improve the first efficiency and capacity of the battery. The advantage of this pre -lithium method is that it can simulate the normalization of normalization into the process, while ensuring that the formation of the SEI membrane is similar to that of lithium ion batteries, but the prematureization of the negative chip into the two processes of the presence of positive and negative chips, the operation is more difficult to operate, the operation is more difficult to big.(Lithium - Ion Battery Equipment)
2. Negative spraying lithium powder method
Make a stable metal lithium powder particles, the inner layer of the particles is metal lithium, and the outer layer is a protective layer with a good lithium ion drive rate and electronic conductivity. In the organic solvent, spray the decentralized body on the negative chin, and then dry the residual organic solvents on the negative chip, so that the pre -lithium negative chip is completed.
When it turns into it, the lithium powder sprayed on the negative electrode will consume the formation of the SEI membrane, so as to maximize the lithium ion dewang from the positive electrode and increase the capacity of the lithium ion battery. It is more difficult to ensure that the cost of materials and equipment is high.
3. The three -layer electrode method of the negative electrode
Compared with the normal copper foil, the copper foil of the three -layer electrode method is coated with the metal lithium powder that it will be transformed into the later stage. In order to protect the lithium powder does not respond to the air, it is also applied to a protective layer. On the layer.
When the battery is completed, the protective layer will be dissolved in the electrolyte, so that the metal lithium is in contact with the negative electrode, and the lithium ion consumed by the SEI membrane when it is turned into a metal lithium powder. This method is processed by the lithium ion battery plant The conditions do not have harsh requirements, but the stability of the protective layer in the polar section, rolling, cutting and other stations is a great challenge to the development of electrode materials. It's quite difficult.
4, Zhengzheng Lithium Material Method Method
When the first effect of the negative pole is lower than the positive electrode, there will be too much lithium ion loss in the negative electrode when it is turned into the negative electrode, which causes the positive effective space of the positive electrode after the discharge to be welcomed by the lithium ion, forming a waste of the positive embedded lithium space; if a small amount is added to the positive electrode The high -grade capacity is lithium -rich material, so that it can supply more lithium ions for the formation of the SEI membrane when it turns into the formation of the SEI membrane, and there is no need to worry that the lithium -rich material cannot be embedded again when discharge.
Second, lithium -ion battery pre -lithium technology
The common pre -lithium method is negative electrode lithium, such as lithium foil and lithium supplementation, lithium powder supplementation, etc., which are currently a pre -lithium technology that is currently developing. Lithium technology.
1. Lithium foil nourishing lithium
Lithium foil supplementation is a technology that uses self -mounted motors to supplement lithium. The potential of the metal lithium is the lowest among all electrode materials. Due to the poor potential, when the negative electrode material is in contact with the metal lithium foil, the electron moves spontaneously to the negative electrode, accompanied by the embedding of li+in the negative electrode.
2. Stable lithium metal powder (SLMP)
Compared with the addition of adding during the slurry process, SLMP is easier and easy to load directly to the dry electrode surface of dry. Use SLMP to pre-lithium silicon-carbon nanotuba, drip the mass score of 3%SLMP/toluene solution on the surface of the negative surface of the silicon-carbon nanot barrel. Later, the first irreversible capacity of the negative electrode decreased by 20%to 40%.
3. Silicized lithium powder
The size of nano -silicon lithium powder is very small, which is more conducive to the dispersion in the negative electrode; in addition, it is already expanding, and the volume change during the cycle will not affect the structure of the entire electrode.
