The concentration of NMP solution can detect the importance in lithium battery production

Methyl N-methylpyrrolidone is a highly polar aprotic solvent nmp solvent. It is a colorless, transparent or pale yellow oily liquid with a slight amine odor and mild irritation to the skin.

NMP has the characteristics of high boiling point, strong polarity, low viscosity, strong solubility, non-corrosive, low toxicity, low volatility, non-flammable, good chemical and thermal stability, biodegradable and recyclable. It is easily soluble in water, ethanol, ether, acetone, ethyl acetate, chloroform and benzene, and can dissolve most organic and inorganic compounds, polar gases, natural and synthetic polymer compounds.

At present, it is mainly used in coatings, lithium batteries, plastics, chemicals, pesticides, pigments, cleaning agents, insulating materials and other industries nmp. The application of NMP in lithium battery industry is highlighted.

Application of NMP in the field of lithium batteries

Lithium-ion batteries are currently widely used in many problem areas in my country. In addition to laptops, mobile phones, electric bicycles, and electric vehicle companies in daily life, lithium-ion batteries also have an important data application in the development of energy storage.

Industry research data shows that, in general, lithium-ion battery manufacturing costs account for about 3% to 6% of manufacturing costs 1 methyl 2 pyrrolidone. It is less expensive than anodes, anodes, electrolytes, and diaphragms, but its role cannot be ignored. The market size and demand for NMP is also growing along with Li-ion batteries, especially in energy storage and batteries.

The important role of NMP in lithium battery production

The use of NMP in the production of lithium batteries is to dissolve/swell PVDF, and to dilute the slurry at the same time. The concentration requirement is generally above 99.9%. As one of the main auxiliary materials in the manufacturing process of lithium-ion batteries, NMP directly affects the coating quality and environmental protection requirements of lithium-ion batteries.

NMP is a necessary solvent for PVDF (polyvinylidene fluoride), the positive electrode binder of lithium batteries. NMP is miscible with water, PVDF, positive and negative electrode materials, so it is widely used in the preparation of lithium batteries. When making electrode sheets, NMP can be used as a solvent to fuse various materials required for electrodes, such as binders, positive electrode active materials, conductive agents, etc., so that the binders can fully contact and distribute evenly with other materials.

Analysis of economic, social and environmental benefits of NMP

In 2021, thanks to the rapid development of the new energy vehicle industry, the price of NMP has risen from 15,000 yuan per ton at the beginning of 2021 to more than 40,000 yuan per ton at present.

In the production process of lithium batteries, NMP is used as an expensive solvent, and high-temperature NMP waste gas will be generated during the coating process. If it is not recycled effectively, it will not only waste raw materials, but also cause serious pollution to the environment. China also has relevant control requirements for NMP emissions. The benchmark value of NMP in the clean production evaluation index system (trial) of the battery industry is 1.5mg/m3. "Battery Industry Pollutant Emission Standards" stipulates that the concentration limit of NMP waste gas organized emission is 50mg/m3. Therefore, strengthening the emission control and recycling of NMP in lithium battery production has significant economic and environmental benefits.