Method for producing a dry film, rolling device, dry film, and substrate coated with the dry film

Abstract

The invention relates to a method for producing a dry film (3), wherein a dry powder mixture is processed into the dry film (3) by a rolling device comprising a first roller (2a) and a second roller (2b). The first roller (2a) has a higher circumferential rotational speed than the second roller (2b), and the dry film (3) is placed on the first roller (2a).

Description

technical field [0001] The invention relates to a manufacturing method of a substrate, a rolling device, a dry film and a substrate covered with the dry film. Background technique [0002] In the production of battery electrodes, layers of 50 μm to 100 μm thick must be applied to metal current collectors at high winding speeds. This is usually accomplished by a wet chemical "roll-to-roll" procedure of a suspension of the active substance in an aqueous or organic solvent. For this, a high energy input is required both for the dispersion of the active substance and for the drying of the layer. There is an increasing effort to achieve coating in a solvent-free (ie thus dry) manner. For this, a dry powder mixture of active material, conductive agent and suitable binder must be converted into a mechanically carrying layer. [0003] Some methods are known in the prior art in which, as disclosed in patent document US 7352558 B2, the compression of a free-standing film is achieve...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the powder application must be followed by sealing or mechanical stabilization by calendering, thus requiring additional processing steps

Also, for this method, planar target substrates must be used

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