Systems and methods for suppressing dendrite formation in metal / air fuel cells, batteries, or metal regenerators

摘要

A System and method is disclosed for preventing dendrite formation in a fuel cell, battery or metal recovery system. Typical metal/air fuel cell stacks comprise a plurality of cells electrically coupled together in a serial fashion. Electrolyte is typically pumped through the cells on a continuous basis using an input and output manifold device having a number of channels equal to the number of cells comprising the stack. This parallel connection causes the formation of metallic dendrites in the channels, which can short circuit the fuel cell stack or battery or metal-recovery apparatus. The system and method provides one or more dendrite elimination zones to prevent the formation of dendrites. The dendrite elimination zones are constructed within each cell or within each manifold to prevent the electrochemical reaction associated with dendrites from taking place. The dendrite elimination zones are characterized by the substantial lack of a metal negative electrode, such as zinc, in the volume of the zone, and the substantial presence of a cell positive electrode through the volume or adjacent to the volume.