PURPOSE: To suppress self discharge, decrease internal resistance, and increase discharge performance by placing a porous carbon layer on the surface of a positive electrode containing divalent silver oxide, facing to a negative electrode.
CONSTITUTION: First, an insulating sheet is placed, then preliminary molding pellet 3 of the black mix obtained by mixing a small amount of polytetrafluoroethylene to divalent silver oxide, and a positive electrode ring 4 are placed in a battery case 1 which also acts as a positive terminal, and the positive electrode and the ring 4 are bonded together to the case 1. The exposed surface of the positive electrode bonded to the case 1 is coated with a carbon paint containing carboxymethylcellulose as a binder in the ratio of 5mg/cm2 as a coating amount after drying, and dried to form a porous carbon layer 10. On the layer 10, a negative electrode obtained by mixing carboxymethylcellulose to amalgamated zinc powder is accommodated via a separator comprising a porous polyethylene film and celllophane, and an electrolyte absorbing material of nylon nonwoven fabric, and then a battery is sealed. This process can reduce self discharge and increase discharge performance.
MURAKAMI KAORU
KUMANO YASUYUKI
