“In order to make a battery so small, the Harvard and University of Illinois at Urbana-Champaign team used a 3D printer to create tiny stacks of battery electrodes. Each electrode is thinner than a strand of human hair. The battery is of the standard lithium-ion variety, so with it comes all of the faults and benefits of lithium-ion. The custom 3D printer employed by the team uses special inks that are electrochemically active, and harden into cathodes and anodes once extruded from the printer’s nozzle. The anodes and cathodes were printed in a pattern similar to a common comb, then a case and electrolyte solution were added as finishing touches.”

http://www.extremetech.com/electronics/159122-the-first-ever-3d-printed-battery-is-less-than-1mm-wide

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