PURPOSE:To form a thick positive mix layer having good bonding ability with the current collecting surface, unifirm thickness, and uniform density by spreading paste-like positive mix on the surface of a positive current collecting plate by a metal mask process. CONSTITUTION:Since an opening 2 in a metal mask process is formed as a cutting window, paste is directly spreaded with the tip of a squeegee 1 in the opening and cut by rubbing. The tip having rubber elasticity of the squeegee 1 is kept in a slightly lower position than the upper surface of a cast 9 in a state a, and moves toward states b and c in order with the same level kept. A paste layer 8' is spreaded on the surface of a positive current collector 7 according to movement of squeegee 1. When the cast 9 is removed, a thick layer 8' with smooth surface and uniform thickness if formed.
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