The role of N-methylpyrrolidone in the production of lithium ion batteries

Lithium ion battery is an internationally recognized ideal chemical energy source. It has the advantages of small size, large capacitance and high voltage. It is widely used in mobile phones, laptops and other electronic products. The expanding field of electric vehicles will bring more space for lithium ion battery development in the future.

NMP is a nitrogen heterocyclic compound with a series of excellent physical and chemical properties. It is a non-toxic, high boiling point, strong polarity, low viscosity, low corrosivity, large solubility, low volatility, good stability, and easy to recover highly efficient selective solvent. It is widely used in petrochemical, pesticide, medicine, electronic materials and other fields.

NMP is a very important auxiliary material for the production of lithium ion battery electrodes. It is the most commonly used solvent in the front batching process of lithium ion batteries, commonly known as methyl, scientific name is N-methylpyrrolidone, and molecular formula is C5H9NO.

In the batching stage: as PVDF solvent, participate in the slurry dispersion to form a slurry with uniform medium and stable for a long time within a certain viscosity range.

In the coating stage: as the main liquid carrier of the slurry, it is evenly coated on the metal substrate with a stable thickness. It is required to have very good wettability and fluidity with the metal substrate. In the coating and baking stage: the wet film runs at a uniform speed in the oven, the solvent volatilizes regularly, NMP bears the pore forming function, and NMP volatilizes from the wet film at a stable speed, forming a porous microelectrode structure with uniform pore size and distribution.