NMP in Li battery

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Analysis of Residual N-Methyl-2-Pyrrolidone (NMP) in Lithium-Ion Battery Electrodes

Accurately measuring N-methyl-2-pyrrolidone (NMP) residue is crucial for ensuring appropriate control of electrode quality in lithium-ion battery manufacturing. This necessitates the extraction of residual NMP from battery electrodes for subsequent gas chromatography (GC) analysis. 

NMP in Li battery
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Role of NMP in Lithium-Ion Battery industry

NMP is a solvent commonly used in lithium-ion battery cathode production to dissolve the polymer binder. After application to aluminum foils, NMP is removed by drying, but residual amounts must be monitored to ensure optimal battery performance.

How to achieve the NMP analysis?

NMP extraction method using the Agilent 8697 headspace sampler with the Agilent 8860 GC system and FID detector. The headspace method is most effective than liquid extraction technique. Residual NMP analysis was conducted on real electrode samples to compare the results between headspace sampling (HS) and LE techniques.

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Features of the solution

The 8860 GC system, configured with a split/splitless inlet and FID, with application column.

Chromatograms of NMP in cathode type samples: (A) headspace-based approach, (B) liquid extraction-based approach

  • Method to analyze residual NMP using Agilent 8697 HS sampler with 8860 GC and FID
  • Excellent detection limits, precision, and no carryover
  • HS accurately quantified NMP in anode samples, with 65-78% recovery from cathodes vs. LE method
  • HS is ideal for process control; LE is better for development and troubleshooting
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