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AssigneeHydro-Quebec
InventorsAndre Belanger, Michel Gauthier, Michel Robitaille
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Process of manufacturing thin electrodes, supported on a sheet substrate, the electrodes being made from an element selected form lithium, lithium alloy, or doped lithium, whose melting point does not differ from the melting point of lithium by +50.degree. C. and whose thickness is constant, from a roller of the sheet and a source of the element. According to the invention, there is provided a bath of the element in molten state, the sheet is continuously unrolled, a constant quantity of the molten element is continuously applied on one of the two faces of the sheet, so as to produce a film on the sheet, whose thickness is constant and between abouth 0.1 and about 40.mu. and whose surface is homogeneous and uniform. The process is carried out in such a manner that the molten element is prevented from solidifying while in contact with the sheet, and the solidification of the element on the sheet takes place after formation of the film on the sheet. Electrode made of a sheet coated with a layer of lithium whose thickness is 0.1 to 40.mu..
Process for manufacturing thin electrodes supported on a sheet substrate, said sheet substrate comprising a plastic material which is substantially stable with respect to lithium and is selected from electrically insulating materials and solid polymer electrolytes made conductive with lithium ions, said electrodes being made from an element selected from the group consisting of lithium, lithium alloy and doped lithium, whose melting point does not differ from the melting point of lithium by .+-.50.degree. C., the thickness of said element being constant, from a roll of said sheet and a source of said element, which comprises providing a bath of said element in molten state and keeping said bath under an inert atmosphere, continuously unwinding said sheet, continuously applying on at least one of the two faces of said sheet, a constant quantity of said element in molten state, so as to produce a film on said sheet whose thickness is constant and between about 0.1 and about 40 .mu. and whose surface is homogeneous and uniform, preventing the element in molten state from immediately solidifying while in contact with said sheet, and causing a controlled solidification of said element on said sheet after said film has been formed thereon.
Process according to claim 11, wherein said electrolyte comprises lithium salt containing polyether chains, in the form of copolymers, networks or comb polymers.
Half battery comprising an electrolyte disposed on a support which can be peeled off, said electrolyte having been covered with a layer of an element selected from the group consisting of lithium, lithium alloy and doped lithium, the melting point of said element being close to that of lithium to +50.degree. C., the layer of said element having a uniform thickness varying between about 0.1 .mu. and about 40 .mu., the surface of said layer being substantially free of asperities and cannot be removed from the electrolyte by means of a knife.
Dependencies are inferred from the claim text.