The manufacture of electric batteries requires the handling of explosive and highly flammable products. N-methyl-2-pyrrolidone (NMP) is used as an organic solvent in the production of lithium-ion battery cathodes. Concretely the production of the cathode consists of:
1- Coating the electrode with a solution of active materials approved by the solvent NMP.
2- Dry the film continuously in an oven at a temperature between 100 and 130°C, under controlled conditions to avoid any risk of explosion due to the evaporation of the solvent.
During this delicate operation, the NMP will turn into a gaseous state and evaporate into the oven drying air; At this point, it is imperative to remove it from the oven for two reasons:
1- For safety, because a too high concentration of NMP can be the cause of a risk of explosion.
2- For efficiency, because the drying operation requires controlled physico-chemical conditions.