EVEN MORE GENIUS BENEFITS FROM 3D PRINTING ….
A team based at Harvard University and the University of Illinois at Urbana-Champaign has printed precisely interlaced stacks of tiny battery electrodes, each less than the width of a human hair. 3D printing can now be used to print lithium-ion microbatteries the size of a grain of sand. The printed microbatteries could supply electricity to tiny devices in fields from medicine to communications, including many that have lingered on lab benches for lack of a battery small enough to fit the device, yet provide enough stored energy to power them.
“Not only did we demonstrate for the first time that we can 3D-print a battery, we demonstrated it in the most rigorous way,”
In recent years engineers have invented many miniaturized devices, including medical implants, flying insect-like robots, and tiny cameras and microphones that fit on a pair of glasses. But often the batteries that power them are as large or larger than the devices themselves — which defeats the purpose of building small.
To get around this problem, manufacturers have traditionally deposited thin films of solid materials to build the electrodes. However, due to their ultrathin design, these solid-state micro-batteries do not pack sufficient energy to power tomorrow’s miniaturized devices.
The scientists realized they could pack more energy if they could create stacks of tightly interlaced, ultrathin electrodes that were built out of plane. For this they turned to 3D printing. 3D printers follow instructions from three-dimensional computer drawings, depositing successive layers of material — inks — to build a physical object from the ground up, much like stacking a deck of cards one at a time.