To enhance adhesion between active materials and between an active material and a metal collecting body by binding the electrode active material by a binding agent composed of bisallylnadiimide compound or allylnadiimide compound, which are addition polymerization type imide monomer of water dispersive low molecular weight.

In manufacturing a positive electrode, bis-allylnadiimide compound or allylnadiimide compound is mixed to a mixture with electric conductor powder of carbon, etc., as necessary to positive electrode active material powder of LiMn2O4, etc., as a binding agent and water is added thereto prepare a uniform water slurry. This water slurry is applied to the surface of a collecting body composed of a conductive metal foil using such a method as coating by a doctor blade and dried. It is pressed as necessary and heat treated by heating to 100-500°C. One hour or more heating treating is usually sufficient. An Al or Ni foil, or a mesh material is especially suited to the collecting body.