  Porous metallic structures are regularly used in electrochemical energy
storage devices as supports, current collectors or active electrode materials.
Bulk metal porosification, dealloying, welding or chemical synthesis routes
involving crystal growth or self-assembly for example, can sometimes provide
limited control of porous length scale, ordering, periodicity, reproducibility,
porosity and surface area. Additive manufacturing and 3D printing has shown the
potential to revolutionize the fabrication of architected metals many forms,
allowing complex geometries not usually possible by traditional methods, but
enabling complete design freedom of a porous metal based on the required
physical or chemical property to be exploited. We discuss properties of porous
metal structures in EES devices and provide some opinions on how architected
metals may alleviate issues with electrochemically active porous metal current
collectors, and provide opportunities for optimum design based on
electrochemical characteristics required by batteries, supercapacitors or other
electrochemical devices.
