Patent ID: 6660435
Filing Date: 2003-12-09
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
An organic electrolyte electric cell comprising:a first electrode comprising the superposition of a first layer containing an electrochemically active material and a porous second layer of a polymeric material having a free face; and a second electrode comprising a porous layer having at least one free face and containing an electrochemically active material; wherein said electrodes are assembled by adhesive bonding, bonding being carried out by coating an adhesive onto said free face of said porous layer of one of said two electrodes and then bringing said free face coated with a film of adhesive into contact with said free face of said porous layer of said other electrode to form an electrochemical couple, wherein said adhesive is a solution containing a polymer with the same chemical formula as said polymer constituting said second porous layer of said first electrode; a solvent in which said polymer 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 at said adhesive preparation temperature and the proportion of which is insufficient to cause precipitation of said polymer, wherein said polymer of said adhesive is an alloy of polyvinylidene fluoride (PVDF) with a polymer selected from the group consisting of polysulfone, polymethylmethacrylate, polyvinylpyrrolidone and copolymers of polyvinylidene fluoride and polytetrafluoroethylene (PTFE), polyvinylidene fluoride and propylene hexafluoride and polyvinyl acetate (PVAC) and polyvinyl alcohol (PVA).