N-methylpyrrolidone (NMP) is a solvent commonly used in lithium battery production to dissolve lithium salts and polymer electrolytes.

Importance of NMP and manufacturing process

NMP plays an important role as a solvent when making electrode sheets. It can fuse together the materials required for various electrodes,NMP supplier so that the binder fully contacts with other materials and is evenly distributed. The application proportion of NMP in lithium battery preparation reaches 74%. It plays a vital role in improving the energy density and coating quality of lithium batteries.

The quality of NMP directly affects the slurry coating quality of lithium-ion batteries, so it is often used in the front-end batching process of lithium-ion batteries. Generally speaking, NMP accounts for between 3% and 6% of lithium battery manufacturing costs.nmp At the same time, NMP can also be recycled through condensation recovery and purification treatment, which has high economic value.

In lithium battery auxiliary materials, the detection of NMP is very important because it may cause some potential risks to the environment and health.

NMP detection methods include the following commonly used technologies:

Gas Chromatography (GC)

NMP can be separated and detected using gas chromatography. The sample is first passed through appropriate sample pretreatment, such as distillation,lithium from battery extraction or dilution, and then passed through a gas chromatography column for detection and quantification using an appropriate detector (such as a flame ionization detector or mass spectrometer).

Liquid Chromatography (HPLC)

Liquid chromatography is also commonly used for the detection of NMP. The sample undergoes appropriate sample pretreatment, such as extraction or dilution, and then passes through an HPLC column for analysis and quantitation using an appropriate detector (such as a UV-Vis or fluorescence detector).

Ultraviolet-Visible Spectroscopy (UV-Vis)

NMPs can be characterized and quantified by UV-visible spectroscopy. In this method, the ability of an NMP solution to absorb light within a certain wavelength range is measured, thereby determining its concentration.

Mass spectrometry (MS)

Mass spectrometry is a technique for identifying and quantifying chemical compounds. By using a mass spectrometer, the molecular structure and mass of NMP can be analyzed. Mass spectrometry can be combined with gas chromatography or liquid chromatography to improve the sensitivity and selectivity of analysis.

Infrared spectroscopy (IR)

Infrared spectroscopy can be used to analyze the molecular structure and functional groups of NMP. By measuring the specific wavelengths that NMP absorbs in the infrared spectral range, its presence and concentration can be determined.