The role of NMP in the production process of lithium batteries
N-methylpyrrolidone (NMP) is a very important auxiliary material in the production of lithium battery cathode materials. It is a commonly used solvent in the formulation stage of lithium battery cathode materials. According to the lithium battery production process, during the coating and baking stage of lithium battery cathode material production, under the action of circulating hot air, the cathode solvent N-methyl-pyrrolidinone will all volatilize at high temperatures. The gas phase containing N-Methyl-alpha-pyrrolidone is collected and treated through condensation, water spraying, wheel adsorption and concentration and other gas phase collection and treatment measures to form organic liquid containing NMP. By discussing the role, production method, consumption point and purification method of N-methyl-pyrrolidinone the production process of lithium battery cathode materials, we hope to achieve on-site purification, conversion and reuse of N-methylpyrrolidin-2-one organic liquid, which can reduce the cost of raw materials and achieve the reduction of lithium battery production enterprises. This efficiency increase.
N-methylpyrrolidone is a very important auxiliary material in the production process of lithium-ion cathode materials. It is a commonly used solvent in the batching stage of lithium battery cathode materials. Lithium-ion battery cathodes are mainly composed of aluminum foil and lithium-ion coatings. The main production steps are ingredients → coating → baking and drying → forming. During the production process of the positive electrode, lithium ions need to be evenly coated on the aluminum foil. The quality of the coating directly affects the capacity, life and safety of the battery.
NMP is used as a mixed solvent for lithium ions in the batching stage of lithium battery cathode material production. It ensures that lithium ions are evenly dispersed in the N-methylpyrrolidin-2-onesolution while ensuring that it does not react with the cathode material, and the mixed slurry can be guaranteed for a long time within the content viscosity range. stability.
N-Methyl-alpha-pyrrolidone In the production and coating stage of lithium battery cathode materials, NMP, as a liquid carrier for cathode lithium ions, has good wettability and fluidity, allowing the mixed liquid to be evenly coated on the moving cathode aluminum foil substrate.
In the baking stage of NMP lithium battery cathode material production, the aluminum foil substrate coated with the mixed liquid is baked and dried in the oven. The NMP solvent evaporates from the coating layer of the dipped substrate as a gas phase at a stable speed, making the coating The layers form a porous microelectrode lithium ion structure with uniform pore size and uniform distribution. If the NMP solvent evaporates too quickly, the surface coating of the pole piece will crack and fall off, seriously affecting the quality of the lithium battery cathode material.
(N-methylpyrrolidone), also known as N-methylpyrrolidin-2-one (NMP), has a series of excellent physical and chemical properties, including high boiling point, good selectivity, strong polarity, low viscosity, and solubility. Strong, low vapor pressure, low toxicity, high solubility in hydrocarbons and resins, good thermal and chemical stability, and no corrosive effect. As an ideal, efficient and excellent organic solvent, N-methylpyrrolidin-2-one has been widely used in oil refining, petrochemical, chemical and other industries.
