Positive electrode solvent: N-methylpyrrolidone (NMP)

Polarity: NMP is a highly polar aprotic solvent with excellent solubilizing power.
Chemical stability: In neutral solutions, NMP remains stable over extended periods with little tendency to undergo chemical reactions. However, it is susceptible to hydrolysis under strongly acidic or strongly alkaline conditions.
Thermal stability: NMP has a high boiling point (about 202 °C) and good thermal stability under normal processing conditions.
Viscosity: NMP has a low viscosity and exhibits good fluidity in solutions, enabling it to mix quickly and uniformly with other substances.
Hygroscopicity: NMP is strongly hygroscopic and can absorb moisture from the air.