Lithium battery accessories comparable to PVDF, what is NMP?

NMP, full name N-methylpyrrolidone, a colorless and transparent liquid, is one of the most commonly used auxiliary materials for lithium batteries.

Generally speaking, lithium battery auxiliary materials mainly include solvents and binders. The main function of the solvent is to dissolve the positive and negative active materials, and the main function of the binder is to bond the active materials to the current collector. The amount of auxiliary materials is generally 2%-5%, compared with the cost of the four major materials (positive electrode, negative electrode, electrolyte and diaphragm), the cost is small, but the role is very important and cannot be ignored.

Among them, PVDF (polyvinylidene fluoride) is the most commonly used cathode binder, while N-methylpyrrolidone is the most commonly used solvent, and the two are usually used in combination.

NMP is miscible with water, PVDF, positive and negative electrode materials and other substances, and is widely used in the preparation of lithium batteries. When making electrode sheets, N-methylpyrrolidone is used as a solvent to combine binders, positive active materials, conductive agents and other electrodes required by various electrodes. The substances are fused together, so that the adhesive is fully contacted with other substances and evenly distributed. As a solvent, the quality of NMP will directly affect the quality of the lithium-ion battery pull-pull coating.