ECS-RG Economic Hot Rolling Press (W=100mm, 100℃) with Asynchronous Rolling Speed for Dry Battery Electrode (Glovebox Compatible), ERGDBEEHRPARS
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In the fabrication of dry battery electrodes—where active materials, conductive agents, and PTFE binders are "fibrillated" without the use of NMP solvent—the Asynchronous Rolling Speed (ARS) press is a sophisticated tool. Unlike standard calendering where both rollers spin at the exact same velocity, ARS introduces a controlled speed differential between the top and bottom rollers. This creates mechanical shear at the nip, which is the secret to high-performance dry-film electrodes.
Dry electrode technology relies on the fibrillation of PTFE. When you apply both compression and shear, the PTFE particles stretch into a microscopic "spider-web" matrix that holds the active material together. (1) Shear-Induced Fibrillation: By spinning one roller faster than the other (e.g., a ratio of 1.1:1 or 1.2:1), the material is "smeared" slightly as it is crushed. This maximizes the fibrillation of the binder, creating a stronger, more flexible dry film. (2) Surface Smoothing: ARS can help eliminate "orange peel" textures on the surface of the dry electrode, leading to more uniform contact with the current collector. (3) Orientation Control: The speed differential helps orient the polymer chains in the direction of the rolling, which can improve the mechanical tensile strength of the free-standing dry film.
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Dry electrode fabrication processes:
The active material (eg: graphite, LFP, NMC) is mixed with conductive carbon at medium level speed, and then add the PTFE into the mixture and mix it at a low speed (Temperature=10-15℃). Finally a high speed mixing was conducted in a short time to generate partially PTFE fibrillation.
Place the powder mixture onto an Al foil and make a rough rectangular shape (Initial thickness~3-5 mm). A kneading roller can be used to slightly press the loose film back and forth until a rigid film was formed (film thickness 0.5-1.0 mm).
Send the above dry film that covered with two Al foils into the rollers under asynchronous rolling speed (eg: 1:1.1 or 1:1.2). The rolling pressure always keeps in the range of 60-80 kgf (Overpressure will damage/crush the self-standing film). The rolling temperature is 80-100 ℃. Ideally the gap reduction decrement would be 20-30 um.
The thin self-standing dry film can be further laminated (same speed) with carbon-coated foil to form the complete dry battery electrode. |
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