Abstract: In recharging a zinc-halogen secondary battery or battery, zinc dendrite is readily formed on the negative electrode and therefore it has been difficult to form a uniformly thick zinc layer on the negative electrode. This inevitably causes a short cyclic battery lifetime. To overcome this problem, electric pulse treatment is effected at the electrode before dc battery recharging process. In zinc oxide resolving treatment, an electrically positive pulse is applied to the negative electrode. In zinc fine crystal depositing treatment, an electrically negative pulse is applied to the negative electrode. Where the above pulse treatments are effected in combination in the electrolyte including a zinc dendrite inhibitor, a synergistic effect can be obtained.

Abstract: A metal-halogen secondary battery has a high state of charging and a capability of storing a large electric power at a high density. In the secondary battery the electrolyte pressure in the positive electrode chamber is higher than the electrolyte pressure in the negative electrode chambers. The metal ions in the positive electrode chambers are permeated into the negative electrode chambers and reduced, and the halogen ions in the negative electrode chambers are also permeated into the positive electrode chambers and oxidized thereby contributing to the storage of the electric power.