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Posted: Nov 27, 2013

Materials scientists win award for tiny 3D-printed battery

(Nanowerk News) Materials scientists at Harvard University have been recognized by the printed electronics industry for their work on novel 3D-printed lithium-ion microbatteries the size of a grain of sand.
interlaced stack of electrodes that were printed layer by layer to create the working anode and cathode of a microbattery
This image shows the interlaced stack of electrodes that were printed layer by layer to create the working anode and cathode of a microbattery. (SEM image courtesy of Jennifer A. Lewis.)
The printed microbatteries, which could supply electricity to tiny devices in fields from medicine to communications, received the Academic R&D Award on November 20 at the IDTechEx Printed Electronics USA 2013 event in Santa Clara, California.
The award, recognizing “innovation, success and development,” was presented to Jennifer A. Lewis, Hansjörg Wyss Professor of Biologically Inspired Engineering at Harvard School of Engineering and Applied Sciences (SEAS), and a Core Faculty Member of the Wyss Institute for Biologically Inspired Engineering at Harvard University.
The Academic category recognizes researchers who have “made a significant contribution over the past 24 months to the understanding of the principles and accrued knowledge behind printed electronics.”
According to the award description, Lewis’ research team at Harvard “has printed rechargeable 3D Li-ion microbatteries composed of high–aspect ratio anode and cathode micro-arrays that are interdigitated on a sub-millimeter scale, and exhibit amongst the highest area energy and power densities reported to date. These microbatteries occupy volumes less than 1 mm3—equivalent in size to a single grain of sand—and are 1000 times smaller than the smallest commercially available rechargeable batteries. The university is working on developing these batteries for a broad range of autonomous applications, including biomedical devices, micro-UAVs, and distributed sensor arrays (e.g., smart dust).”
3D-printed microbattery
To create the microbattery, a custom-built 3D printer extrudes special inks through a nozzle narrower than a human hair. Those inks solidify to create the battery’s anode (red) and cathode (purple), layer by layer. A case (green) then encloses the electrodes and the electrolyte solution is added to create a working microbattery. (Illustration courtesy of Jennifer A. Lewis.)
The work was announced in June 2013 and published online in the journal Advanced Materials ("3D Printing of Interdigitated Li-Ion Microbattery Architectures").
To create the microbattery, a custom-built 3D printer extrudes special inks through a nozzle narrower than a human hair. Those inks solidify to create the battery’s anode (red) and cathode (purple), layer by layer. A case (green) then encloses the electrodes and the electrolyte solution is added to create a working microbattery. (Illustration courtesy of Jennifer A. Lewis.)
Source: Harvard University
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