Process for production of a multi-layer assembly for an electroc

Details Process for production of a multi-layer assembly for an electroc Process for production of a multi-layer assembly for an electroc

1989-02-21

1992-03-31

Kalafut, Stephen J.

Chemistry: electrical current producing apparatus, product, and

Plural concentric or single coiled electrode

429152, 296233, 296235, H01M 1004

Patent

active

051007460

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention concerns a process for the production of a multi-layer assembly for production of an electrochemical generator with low thickness. It also relates to the multi-layer assembly obtained, and also to production of the complete generator. It is particularly applicable to the production of generators in which the electrolyte is solid and comprised of an ion compound dissolved in an elastomer macromolecular material. The principle of these polymer electrolyte generators is well known to a person skilled in the art, it is particularly described in the French patent published under No. 2 542 322 and entitled: "Macromolecular Material with Ion Conduction Comprised of a Salt in Solution in a Copolymer." Such generators, according to the prior art, are comprised of a positive electrode, an electrolyte and a negative electrode, these three elements being sandwiched between two metallic collectors.
As indicated in the French patent published under No. 2 442 514, the interesting aspect of these generators according to the prior art essentially rests in the fact that they form an elementary multi-layer assembly, in which each of the layers is flexible, has a very low thickness (<80 microns), and adheres strongly to the adjacent layers, the overall thickness of the elementary multi-layer assembly generally being between 30 and 300 microns.
To prepare generators with high energy capacity which use relatively large surfaces, one must produce either stacked or coiled or even various folded forms of such elementary multi-layer assemblies.
In the case of coils or folds, the elementary multi-layer assemblies are subjected to major bending stress. It is known that in order to fold or bend two non-ductile superimposed films without damage, it is necessary that the two films are able to glide relative to one another at the folds or bends. If the two non-ductile films are made into a unit by means of an adhesive, even if it is elastic and only a thin layer, major restrictions are produced at the fold or bend, which result either in rupture of the exterior film or wrinkling of the interior film.
In the case of thin-film electrochemical generators, in other words generators formed of the aforementioned elementary multi-layer assembly, rupture of one of the layers as well as folding of the other results in destruction of the generator, either by rupture of the contact or by a permanent short circuit.


SUMMARY OF THE INVENTION

One aim of the invention it to propose a process for the production of a multi-layer assembly which makes it possible to assemble a thin-film electrochemical generator with a solid polymer electrolyte, using not only stacking techniques, but also coiling or folding techniques, the said process being easy to implement in a continuous manner, thanks to the excellent properties of flexibility, adhesiveness and mechanical resistance of the elements used to form the said multi-layer assembly.
The process according to the invention for the production of a multi-layer assembly which can be used for the assembly of thin-film electrochemical generators with a solid polymer electrolyte, working with stacking, coiling or folding, essentially consists of applying to one another at least one two-layer sub-assembly comprised of a layer of solid polymer electrolyte adhered to a composite positive electrode layer, and designated in the following by the term "electrolyte/electrode sub-assembly," a lithium layer or a layer of a ductile alloy based on lithium, and a layer of a metal with low ductility, carrying out this operation in such a manner that the layer of lithium or lithium-base ductile alloy does not come into contact with a composite positive electrode layer.
Advantageously, the electrolyte/electrode sub-assembly used in the operations which result in the multi-layer assembly is deposited onto a carrier, the said carrier consisting either of a layer of a metal with low ductility or even of a film of plastic which can be peeled off, in other words easily removed from

REFERENCES:
patent: 4345954 (1985-12-01), Panchu
Chemical & Engineering, vol. 63, No. 20, May 20, 1985, D. F. Shriver et al.: "Solid Ionic. These Unusual Materials Applications in High-Energy-Density", pp. 42-57.

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