Metal working – Method of mechanical manufacture – Electrical device making
Patent
1989-02-21
1990-11-06
Skapars, Anthony
Metal working
Method of mechanical manufacture
Electrical device making
429213, 429192, 4273722, H01M 600
Patent
active
049683195
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for the production of an electrochemical sub-assembly, comprising a positive electrode and an electrolyte, and also the sub-assembly obtained in this way. This sub-assembly finds particular application for the production of complete electrochemical generators, of the type as described in the European Patent No. 013199, these generators essentially comprising a solid polymer electrolyte composed of a salt in solution in a macromolecular material, such as, for example, an ethylene polyoxide and/or one of its copolymers, and a composite positive electrode comprised of the product of agglomeration in a composite mass of a material with ion conduction, composed of a salt in solution in a macromolecular compound, of an electrochemically active material such as, for example, a vanadium oxide or titanium disulfide, and of an electron conductor material, such as, for example, carbon black.
These generators can be assembled in any manner, but they can also be assembled as described in the patent application filed on the same day by the same applicants and entitled: Multi-Layer Assembly for Carrying out Assembly of a Thin-Layer Generator, the Process of Manufacture of this Assembly and Production of the Complete Generator, and the Generator Obtained in this Way.
In order for such complete generators to demonstrate good performance, both electrochemically and mechanically, it is important that in the two-layer sub-assemblies comprised of the electrolyte layer associated with the positive electrode, the said layers possess good adhesion to one another and do not possess any preferential orientation of the chains of the macromolecular material at the electrolyte/electrode interface. In fact, such a preferential orientation of these chains can result in problems of de-lamination of the layers, in other words separation and loss of adhesion between the electrolyte and the electrode, which can result in phenomena of excess voltage at the electrodes during operation of the generator, and limits the possibilities of cycling of secondary generators.
On the other hand, during production of these sub-assemblies, it is necessary to avoid that the salt which is in solution either in the electrolyte, or in the electrode, and which can be identical in each of these layers or different, has an overly high concentration in one of these layers. In fact, such a variation in concentration can result in poor interpenetration of the polymer chains as well as precipitation of complexes rich in salt, this precipitation taking place in the unit in which the salt concentration is too high. These complexes, which are crystalline and poor ion conductors, result in a local loss of elasticity of the area around them and of its adhesiveness.
Finally, it is necessary that the sub-assembly obtained has good heat resistance, and, for example, that an elevation of temperature during the course of a process of assembly or during a final production phase of this two-layer sub-assembly does not cause the latter to deteriorate, which can happen when using a solvent whose solvent power increases with temperature.
The invention has the purpose of establishing a process which allows production of an electrochemical sub-assembly of the type described above, which meets the conditions stated above.
For this, the invention provides a process for production of a two-layer electrochemical electrolyte/electrode sub-assembly comprising, in the form of thin films, a layer of a composite positive electrode composed of the agglomeration product of a composite mass of material with ion conduction, composed of a salt in solution in a macromolecular compound, of an electrochemically active material and an electron conductor material, and a layer of a solid electrolyte composed of a salt in solution in a macromolecular material with ion conduction, this process consisting of: comprising the elements constituting this layer, on this partially cross-linked layer, constituting the said other layer, this latter liquid phase having th
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Chabagno Jean-Michel
Duval Michel
Muller Daniel
Hydro-Quebec
Skapars Anthony
Societe Nationale Elf Aquitaine
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