Electrode Coating in Lithium-Ion Pouch Cell Manufacturing

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Electrode Coating in Lithium-Ion Pouch Cell Manufacturing

After slurry preparation, electrode coating applies the prepared slurry onto metal current collectors to form the active electrode layer. Coating quality strongly influences electrode thickness, loading, uniformity, and downstream battery performance.

Role of the Current Collector

The slurry is coated onto a conductive metal substrate called the current collector. Aluminum foil is commonly used for the cathode, while copper foil is commonly used for the anode.

Purpose of Electrode Coating

  • Apply a uniform active-material layer
  • Achieve the required loading and thickness
  • Maintain consistent coating width
  • Provide stable adhesion to the current collector

Coating Process Sequence

  1. The current-collector roll is loaded and unwound.
  2. The prepared slurry is supplied to the coating head.
  3. The slurry is applied to the moving foil.
  4. The coating gap and flow are controlled to obtain the target wet thickness.
  5. Uncoated regions are maintained where required for tabs and current-collector connections.
  6. The coated foil proceeds to drying.

Critical Process Parameters

  • Slurry viscosity
  • Coating speed
  • Coating gap
  • Wet coating thickness
  • Loading density
  • Coating alignment

Common Coating Defects

  • Uneven coating thickness
  • Pinholes
  • Streaks
  • Coating cracks
  • Edge defects
  • Delamination
  • Incorrect coating width
Quality Impact: Coating defects can propagate through drying, calendering, slitting, and cell assembly, ultimately affecting capacity, resistance, and reliability.

Conclusion

Electrode coating is one of the key processes that defines electrode quality. Stable slurry properties, accurate coating parameters, and continuous inspection are essential for consistent battery performance.

#ElectrodeCoating #BatteryManufacturing #LithiumIonBattery #PouchCell #BatteryEngineering #EVBattery

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