We rely on many different types of energy sources to get through the day for our mobile power needs, making batteries a big industry. Researchers are continuing to look for ways to refine them for more streamlined use, however.
In ‘Three-Dimensional Printing of a Complete Lithium Ion Battery with Fused Filament Fabrication,’ US researchers explore ways to customize these smaller sources of energy, plus building them into components. They point out that much work has been done previously with batteries, featuring everything from spray paintable batteries to stretchable batteries. In connection with 3D printing, researchers have experimented with fabricating ink-printed electrodes, as well as those fabricated with graphene. The goal is to remove the current limits caused by conventional shapes.
“Although there have been many recent advances in the creation of unconventional battery form factors, most prototype fabrication methods are limited to curved or flat surfaces,” states the team in their paper.
In exploring 3D printing with electronics, the team points out that this is an area making enormous strides, but the batteries are still always a separate quotient. The key is in printing everything at once—including all the following for the battery:
- Current collector
- Battery case
With the use of a low-cost FFF 3D printer and PLA as a material, the researchers measured the amount of swelling caused in the PLA by the nine solvents they used, along with the rising levels of conductive power, the amount of improvement and retention in PLA conductivity after lithium infusion, and they examined the effects of conductive carbon filler on performance.
“We hypothesized that PLA could be converted into an ionically conducting matrix by swelling the polymer with liquid electrolytes, thereby enabling the 3D printing of a lithium ion battery,” stated the researchers.
They were able to increase the conductivity of the material significantly and were able to fabricate batteries that withstood 100 cycles but showed a low capacity because of the large amounts of PLA required.
“Nevertheless, we used these new composite filaments to demonstrate that a full 3D printed LIB can be made in a single print with no assembly required, and that integrated 3D printed batteries can be used to power electronic devices such as 3D printed LCD sunglasses and an LED bangle,” state the researchers.
The team figured out how much conductive filler they could add to the PLA for creating successful battery power and found that performance increased as ‘the ratio of active to conductive material decreased.’
They created a 3D printed full cell with all components inside the coin cell:
“All printed anodes, cathodes, and separators were 16 mm in diameter and 150 μm thick, and were infused with 1 M LiClO4 in 50/50 vol EMC/PLA prior to assembly. Electrifi filament was used for 3D printing the current collectors, as it has the highest conductivity of all commercially available conductive filaments. Pure PLA was used for printing the separators.”
The team also printed two different wearable devices with built-in batteries—a pair of glasses, and a bracelet, demonstrating that it is feasible to create functional objects that run on stable power.
“These results should benefit those seeking to create energy storage materials and devices that can be 3D printed to create batteries in arbitrary shapes,” concluded researchers.
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