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Monitoring NMP in Lithium Ion Battery Drying Applications

Lithium Ion Battery Electrode manufacturing Drying process

Li-ion battery electrodes are manufactured by casting a slurry onto a metallic current collector. The slurry contains an active material, conductive carbon, and a binder. The binder is pre-dissolved in a solvent, most commonly N-Methyl-2-pyrrolidone (NMP).  After mixing, the resulting slurry is cast onto the current collector and then dried. Evaporating the solvent to create a dry porous electrode is needed to fabricate the battery. Drying can take a wide range of time with some electrodes taking 24 hours at more than 120 °C to completely dry.

As concentrations of NMP build up, the risk of explosion increases. An ideal location to detect NMP is within the exhaust duct. By utilizing direct insertion design into the exhaust duct, detection of NMP will be at the center of the duct and able to withstand high temperatures and high concentrations.

Li-ion Drying process

The Riken Keiki SD-2500 series is ideal for detecting NMP during the Drying process as it can be inserted directly into the the Exhaust Duct in the Drying line . It has a 250mm insertion for the sensor and can withstand temperatures upto 250 Degrees Centigrade (SD-2700)

SD-2500 for Li-ion Drying Process

For Full spec on the SD-2500 series please see link below 

SD-2500 Series