Process for producing an electrolytic cell having a polymeric separator
AssigneeAlcatel
InventorsXavier Andrieu, François Boudin, Ib Ingemann Olsen
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Abstract
A polymeric separator for an organic electrolyte electrochemical system comprises an elastomeric polymer, optionally, a polymer which swells in the organic electrolyte and with which the elastomeric polymer forms an alloy and, optionally, an inorganic compound. The polymeric separator has a microporous structure characterized by a porosity in the range 30% to 95% and pores with an average diameter in the range 0.1 μm to 5 μm.
Claims9
A process for the production of an electrolyte electric cell comprising at least two electrodes each comprising a porous layer containing an electrochemically active material and a binder, and a polymeric separator comprising an elastomeric first polymer, a second polymer which swells in an organic electrolyte and with which said elastomeric polymer forms an alloy;
- and an inorganic compound, said polymeric separator having a microporous structure characterized by a porosity in the range of 30% to 95% and pores with an average diameter in the range of 0.1 μm to 5 μm, said separator formed by the steps of forming a solution constituted by said elastomeric polymer, said polymer which swells in said organic electrolyte, and said inorganic compound, dissolved in a solvent which is common to the two polymers;
- spreading said solution on a support in the form of a film;
- adding to said solution, either before or after said spreading, a non-solvent which is miscible with said solvent;
- and drying said film to eliminate said solvent and said non-solvent, said process comprising a step of assembling said separator and said electrodes to form an electrochemical couple comprising said separator located between said porous layer sides of said two electrodes;
- impregnating said porous layer sides of said electrodes and impregnating said separator with said electrolyte;
- and carrying out said assembly step by uniting said separator with said porous layer sides of said electrodes;
- wherein said support is a plate of a chemically inert material which is separated from said film once it has dried.
A process for the production of an electrolyte cell comprising at least two electrodes each comprising a porous layer containing an electrochemically active material and a binder, and a polymeric separator comprising an elastomeric first polymer, a second polymer which swells in an organic electrolyte and with which said elastomeric polymer forms an allow;
- and an inorganic compound, said polymeric separator having a microporous structure characterized by a porosity in the range of 30% to 95% and pores with an average diameter in the range of 0.1 μm to 5 μm, said separator formed by the steps of forming a solution constituted by said elastomeric polymer, said polymer which swells in said organic electrolyte, and said inorganic compound, dissolved in a solvent which is common to the two polymers;
- spreading said solution on a support in the form of a film;
- adding to said solution, either before or after said spreading, a non-solvent which is miscible with said solvent;
- and drying said film to eliminate said solvent and said non-solvent, said process comprising:
- assembling said separator and said electrodes to form an electrochemical couple comprising said separator located between said porous layer sides of said two electrodes;
- producing a separator such that said porous layer side of a first one of said electrodes comprises said support and is covered with said separator and said separator has a free face;
- coating said free face side of said separator with a film of adhesive and/or coating said porous layer side of a second one of said at least two electrodes with a film of adhesive;
- and
- carrying out said assembly step by uniting said separator and said second one of said at least two electrodes and exerting slight pressure on said electrochemical couple formed;
- wherein said adhesive is a solution containing:
- a polymer composition with the same chemical formula as the polymers constituting said separator;
- a solvent in which said polymer composition readily dissolves at an adhesive preparation temperature;
- and
- a non-solvent which is miscible with said solvent, which does not or only slightly dissolves said polymer composition at said adhesive temperature, and said non-solvent being present in a proportion which is insufficient to cause precipitation of said polymer composition.
A process for the production of an electrolyte cell comprising at least two electrodes each comprising a porous layer containing an electrochemically active material and a binder, and a polymeric separator comprising an elastomeric first polymer, a second polymer which swells in an organic electrolyte and with which said elastomeric polymer forms an allow;
- and an inorganic compound, said polymeric separator having a microporous structure characterized by a porosity in the range of 30% to 95% and pores with an average diameter in the range of 0.1 μm to 5 μm, said separator formed by the steps of forming a solution constituted by said elastomeric polymer, said polymer which swells in said organic electrolyte, and said inorganic compound, dissolved in a solvent which is common to the two polymers;
- spreading said solution on a support in the form of a film;
- adding to said solution, either before or after said spreading, a non-solvent which is miscible with said solvent;
- and drying said film to eliminate said solvent and said non-solvent, said process comprising:
- assembling said separator and said electrodes to form an electrochemical couple comprising said separator located between said porous layer sides of said two electrodes;
- producing a separator such that said porous layer side of a first one of said electrodes comprises said support and is covered with said separator and said separator has a free face;
- coating said free face side of said separator with a film of adhesive and/or coating said porous layer side of a second one of said at least two electrodes with a film of adhesive;
- and carrying out said assembly step by uniting said separator and said second one of said at least two electrodes and exerting slight pressure on said electrochemical couple formed;
- wherein said adhesive is a paste constituted by said electrochemically active material of said porous layer of said second one of said at least two electrodes, a third polymer and a solvent which dissolves said third polymer.
Dependencies are inferred from the claim text.