For high-precision electrode calendering, transitioning from simple gap-control (setting the distance between rollers) to pressure-control is the key to achieving consistent energy density and ionic conductivity. In a pressure-controlled system, the machine uses hydraulic or servo-actuators to apply a specific, measurable force (typically in metric tons) regardless of slight variations in the initial coating thickness.

When using a pressure-control press, your goal is to optimize the Packing Density (PD) = m/(A*t). Where m is the mass of active material, A is the area, and t is the post-calendering thickness. (1) 10% Rule: For most lithium-ion cathodes (NMC/LFP), aim for a thickness reduction of approximately 10–20% per pass. Attempting more can cause "spring-back" or delamination. (2) Thermal Softening: Calendering at 60-100 °C reduces the yield strength of the PVDF binder, allowing for higher density at lower pressures and reducing the risk of foil cracking. (3) Linear Pressure: In production, pressure is often reported as N/mm (force divided by the width of the electrode). Lab machines that report total "Tons" should be converted to linear pressure for academic reporting.

Part Number	ESLECPCHRP (ESL-EC-PCHRP)
Power	AC220V±10%, three-phases, 50/60Hz, 8000 W
Hot Roller	Φ196 x 320 mm (effective width for hot rolling: 300 mm) 9Cr3Mo, surface coated with chromium layer with a thickness of >0.08mm HRC65~70, hardness layer thickness ≥15mm 1.5KW AC frequency conversion motor
Hydraulic Pressure	Max. 30T, adjustable in HMI touch screen
Rolling Temperature	Max. 150 °C (IR heating tubes) These IR heating tubes are easily installed and replaced.
Calendering Speed	0.5-4.8 m/min, digital display, adjustable
Calendering Gap	0-3 mm, manually adjustable
Calendering Effect	± 3μm (Only if the uniformity of the sample is ≤ ±2μm)
Roll-to-Roll Integration (Optional)	A roll-to-roll unit can be integrated with the hot rolling press for electrode roll calendering
Note	Each time the reduced thickness is 20%-25%. Multiple-rounds calendering is needed for higher coating thickness reduction. For example, the initial electrode thickness is 200 um, then 180 um, 160 um, 140 um and so on under a certain pressure.
Dimension	L1240 * W600 * H980 mm
Weight	~800 kg

References:

J. Zhang, et al., Investigation on mechanical and microstructural evolution of lithium-ion battery electrode during the calendering process, Powder Technology, 2022, 409, 117828

M. Abdollahifar, et al., Insights into Influencing Electrode Calendering on the Battery Performance, Adv Energy Mater., 2023, 13, 2300973.