THE SLURRY

A paint made of battery

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Active material About 90–96%: the cathode or anode powder that stores lithium

Conductive carbon A few percent of carbon black or nanotubes to carry electrons

Binder A few percent: PVDF for cathodes, CMC and SBR for anodes

Solvent NMP for cathodes, water for most anodes

The recipe is mostly active material, with just enough helpers.

THE LINE

Make an electrode

Electrode lines run continuously, coating foil at tens of metres per minute.

Mix, coat, dry, calender, slit, dry.

COATING

Spread it thin and even

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Slot-die coating

A precise slit lays a wet film tens to hundreds of µm thick

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Loading

Mass per area sets capacity per area, typically about 2–4 mAh/cm²

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Drying ovens

Tens of metres long; NMP vapour is captured and recycled

A few percent variation in thickness means a few percent variation in capacity.

CALENDERING

Press it to the right density

Heavy steel rollers squeeze the dried coating. Pressing packs more energy into each litre, but leaves less room for the electrolyte. Most electrodes end up with about 25–35% porosity.

Denser means more energy; more porous means more power.

NEW IDEAS

Dry electrodes and thick electrodes

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Dry coating

Mix powders with a fibre-forming binder and press: no solvent, no ovens

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Thick electrodes

Fewer foils and separators per kWh, if ions can still reach the bottom

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Why

Drying and solvent recovery are a big share of factory energy

The cheapest kWh comes from removing steps.

UNIT 11 STUDY COMPLETE

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Ready for the Fab Challenge?

You've followed an electrode from slurry to a pressed, slit roll ready for the cell line.