Scientists develop new 3D-printing method capable of improving smartphone batteries
Lithium-ion battery capacity can be vastly improved if, on the microscale, their electrodes have pores and channels.
3D printing, also known as additive manufacturing, can be used to manufacture porous electrodes for lithium-ion batteries. However, due to the nature of the manufacturing process, the design of these 3D printed electrodes is limited to just a few possible architectures.
Researchers from Carnegie Mellon University and Missouri University of Science and Technology in the US developed a method of 3D printing battery electrodes that creates a 3D micro-lattice structure with controlled porosity.
3D printing this micro-lattice structure improves the capacity and charge-discharge rates for lithium-ion batteries, according to the research published in the journal Additive Manufacturing.
Until now, the internal geometry that produced the best porous electrodes through additive manufacturing was what's known as an interdigitated geometry - metal prongs interlocked like the fingers of two clasped hands, with the lithium shuttling between the two sides.
"In normal batteries, 30-50 per cent of the total electrode volume is unutilised. Our method overcomes this issue by using 3D printing where we create a micro-lattice electrode architecture that allows the efficient transport of lithium through the entire electrode, which also increases the battery charging rates," Panat said.
The research represents a major advance in printing complex geometries for 3D battery architectures, as well as an important step toward geometrically optimising 3D configurations for electrochemical energy storage.
The researchers estimate that this technology will be ready to translate to industrial applications in about 2-3 years.
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