Study on additives for porous zinc electrode of the dry-charged zinc-air cell

Conductive agent acetylene black and water-absorbent sodium carboxymethyl cellulose were added to zinc electrode of dry-charged zinc-air cell to increase capacity utilization of zinc electrode and improve the cell performance. The effects of the additives were also studied by discharge test, anode polarization, AC impedance and SEM. The results show that the discharge capacity of zinc electrode increases from 362 mAh/g to 566 mAh/g at moderate discharge rate of 75 mA/g. The AC impedance measurement indicates that the additives decrease the charge transfer resistance. And the SEM shows the additives make the discharged production on the zinc electrode much smaller and keeps crude porous structure intact. The passivation of zinc has been postponed.