Residual NMP and solvent analysis in lithium-ion battery cathode materials

User Benefits

－Analyze residual NMP and similar solvent structures in the cathode of lithium-ion batteries.
－Optimize drying conditions in the cathode manufacturing process and quantify the amount of residual solvents for quality control.
－Minimize equipment footprint by combining Brevis GC-2050 and GCMS-QP2050.

Introduction

Lithium-ion batteries (LiB) consist of cathode and anode, electrolyte, separator, etc. The electrodes are formed by coating a slurry of active material, conductive additives, binders, etc., mixed in an organic solvent, on a metal film (current collector) and then dried. N-Methyl-2-pyrrolidone (NMP) is known as an organic solvent used in solvent-based slurries, and especially for quality control of the cathode, the residual amount of NMP in the cathode is examined during the drying process.
In this application, a simple analysis method for residual NMP in the cathode of lithium-ion battery NCM (nickel-cobalt-manganese ternary material) using GC-FID with headspace method is introduced. In addition, results of qualitative analysis of other solvents remaining in the NCM cathode using GC-MS and comparison of residual solvent amounts in five different cathodes with different drying processes are also presented.

August 30, 2024 GMT