Title:
A CONTINUOUS ELECTROFORMING PROCESS TO FORM A STRIP FOR BATTERY ELECTRODES AND A MANDREL TO BE USED IN SAID ELECTROFORMING PROCESS
Document Type and Number:
WIPO Patent Application WO2002057515
Kind Code:
A3
Abstract:
A continuous electroforming process to form a strip for battery electrodes, comprising the steps of providing a mandrel having on its surface a reusable pattern subdivided into conductive and non-conductive areas; moving said mandrel through an electroforming bath to deposit a metal layer on said mandrel while it moves through the electroforming bath until the metal layer has assumed the shape of the conductive pattern and a thickness at least sufficient to provide strength for the layer to be removed from said mandrel; and separating said layer from said mandrel; is characterised by moving said strip through at least one subsequent bath in which electrodeposition of metal takes place on both sides of said strip while it is moved through said subsequent bath, applying a current density of at least 10 A/dm² and up to 300 A/dm² to the conductive surface of the moving mandrel and to the metal surface of the strip in each of the subsequent baths; and directing a forced flow of electrolyte onto the surface of the layer and said strip, wherein the reusable conductive pattern of the surface of the mandrel takes the form of at least one battery electrode and the electrolyte contains additives providing increased hardness, increased corrosion resistance and being suited specifically to permit combining a high rate of deposition with controlled surface roughness and controlled composition of the deposit.
Inventors:
WARLIMONT HANS (DE)
Application Number:
PCT/EP2002/000356
Publication Date:
October 24, 2002
Filing Date:
January 16, 2002
Export Citation:
Assignee:
DSL DRESDEN MATERIAL INNOVATIO (DE)
WARLIMONT HANS (DE)
WARLIMONT HANS (DE)
International Classes:
C25D1/04; C25D1/08; H01M4/04; H01M4/64; H01M4/74; C25D1/00; (IPC1-7): C25D1/04; H01M4/74; H01M4/64; H01M4/04; C25D1/08
Foreign References:
| GB2243618A | 1991-11-06 | |||
| DE585633C | 1933-10-12 | |||
| EP0490061A2 | 1992-06-17 |
Other References:
See also references of EP 1354076A2
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