Abstract

An electrochemical zinc-oxygen cell is disclosed which has annular electrodes wherein oxygen flows through the central portion of a diffusion cathode and a liquid electrolyte flows between a separator surrounding the diffusion cathode and concentric anode spaced from the separator. The disclosed cell may be recharged electrochemically or by replenishment of active zinc particles in the electrolyte exterior to the cell. The electrochemical cell of the present invention provides a zinc-oxygen cell having a zinc anode surface providing more even contact with the active electrolyte and more even surface upon repeated electrochemical recharging than prior cells while permitting higher pressure differentials across the oxygen diffusion cathode structure than prior art cells.