Electrode/current collector, laminates for an electrochemical device

A method for the production of an electrode/current collector laminate for an electrochemical device by forming a layer of an electrode paste on at least one side of a current collector foil, said method comprising the steps of:

• a) loading said electrode paste into cells or grooves of a patterned matrice roll;
• b) transferring said electrode paste onto said current collector foil either directly or indirectly via an offset roll;
• and
• c) drying said electrode paste to provide a layer of at least 20 μm in thickness;
• wherein said electrode paste comprises particles of an electrode material, solvent and binder, and displays a pseudoplastic viscosity profile and wherein said current collector foil is a conductive polymer foil.

A method for the production of an electrode/current collector laminate for an electrochemical device by forming a layer of an electrode paste on at least one side of a current collector foil, said method comprising the steps of:

• a) loading said electrode paste into cells or grooves of a patterned matrice roll, wherein said electrode paste comprises:
• i) 10-60% by weight of electrode material,
• ii) 0-20% by weight of an electronically conductive additive,
• iii) 1-20% by weight of binder,
• iv) 20-88% by weight of solvent, and
• v) 0-20% by weight of auxiliary materials;
• b) transferring said electrode paste onto said current collector foil either directly or indirectly via an offset roll;
• c) drying said electrode paste to provide a layer of at least 20 μm in thickness wherein said electrode paste comprises particles of an electrode material, solvent and binder, and displays a pseudoplastic viscosity profile;
• and
• d) performing a plurality of paste transferring operations to said current collector foil each followed by drying the electrode paste and in which at least one of said transferring operations provides a layer at least 20 μm in thickness wherein in at least two of said paste transferring steps the paste differs in porosity so as to obtain a porosity profile in said electrode which varies with depth.