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

A manufacturing method, dry film technology, applied in electrode manufacturing, final product manufacturing, electrode rolling/calendering, etc.

Active Publication Date: 2020-03-06
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

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Embodiment Construction

[0037] figure 1 Illustrated is a schematic side view of the roller compaction unit, where, starting from the powder conveyor 1, the dry powder mixture stored in the powder conveyor 1 passes over two chrome-plated calender rollers 2a and 2b of the same size, and through the calender rollers Transition to a stable state by application of pressure and shear. Here, the first calender roll 2a operates at a higher rotational speed than the second calender roll 2b, so that the formed dry film 3 remains on the first calender roll 2a after the combined pressing and shearing operations.

[0038] In the representative example shown, the dry powder used is in a premixed state and contains 90% by weight Ketjen black / sulfur (1:2m / m), 3% by weight polytetrafluoroethylene (PTFE) and 7% by weight % of multi-walled carbon nanotubes (MWCNTs). For Li-ion electrodes, typically 95% by weight lithium manganese oxide, 3% by weight conductive agent (in this case multi-walled carbon nanotubes, MWCNT...

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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...

Claims

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Application Information

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IPC IPC(8): B29C43/24B29C43/58H01M4/04B29L31/34
CPCB29C43/24B29C43/58H01M4/0435B29K2705/10B29L2031/3468B29K2427/18B29K2507/04B29K2105/122B29C43/006B29C43/28B29K2105/167H01G11/86B29C2043/5833B29K2705/00H01M4/0404H01M4/139H01M4/1391H01M4/661H01M4/663H01M4/667H01G11/06H01G11/28H01G11/50H01G11/70Y02E60/10Y02P70/50B29C43/32B29D7/01H01M10/0525H01M4/485H01M4/505H01M4/525H01M4/58H01M4/625H01M4/662H01M4/623
Inventor 霍尔格·奥图塞巴斯蒂安·糖奥克本杰明·舒姆斯特凡·卡斯凯尔克里斯蒂安·舒尔特丹尼尔·弗里茨凯·舍恩赫尔
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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