Dry electrode process

Example

Use in Lemonergy

Place operations and quality checks in process order.

This is a reference concept. No executable Lemonergy block has been verified for this term.

Learn it in Lesson 3 · Cell production →

Connected concepts

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Coating

Applying slurry to the moving foil at a controlled wet thickness, usually with a slot die, often on both sides. Coating weight per area must be held within about one percent across the web, because every downstream property depends on it.

Drying

Evaporating the solvent from the wet coating in an oven tens of metres long. Drying too fast drives binder to the surface and weakens adhesion to the foil; it is the most energy-hungry step in the plant.

NMP

The solvent that dissolves PVDF binder for positive-electrode slurries. It is toxic and regulated, so plants recover and distil nearly all of it; eliminating it is a main motivation for dry electrode processes.

PTFE

The fluoropolymer binder of dry electrode processes: under shear its particles draw out into fine fibrils that web the active material together without any solvent. It is unstable at the low potential of graphite, which complicates dry negative electrodes.

References & further reading

Technical references

1. Current and future lithium-ion battery manufacturing

   Yangtao Liu, Ruihan Zhang, Jun Wang, Yan Wang · iScience · 2021

   Technical reference · Electrode preparation, cell assembly, formation and manufacturing trade-offs.