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Researchers develop spray-on batteries

A team of researchers from Rice University has found a way to power almost any object by spraying with a paint that has been formulated to function as a battery.

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Ceramic tiles coated with battery paints and then heat-sealed powered LEDs spelling out "RICE" for six hours in an experiment at Rice University. The lithium-ion batteries can be painted on virtually any surface.

Jeff Fitlow/Rice University

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The rechargeable lithium-ion batteries now found in many mobile phones and laptops may one day be sprayed like paint onto virtually any surface, potentially ushering in a new generation of thin, flexible devices, researchers say.

Spray-paintable batteries even might become available to the general public someday at hardware stores, the scientists added.

Lithium-ion batteries power most portable electronics nowadays, but their spiral, jelly-roll-like design generally limits them to rectangular or cylindrical shapes.

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Now researchers have succeeded in painting these batteries onto a diverse range of surfaces, including glass slides, stainless steel, flexible plastic sheets, glazed ceramic tiles, and even the curved side of a beer mug.

"We can convert almost any object to a battery," Neelam Singh, a materials scientist at Rice University in Houston, told InnovationNewsDaily.

He and other researchers spent painstaking hours formulating paints that could function as the separate components of a battery. In their search, they looked at materials as diverse as carbon nanotubes and ultrafine graphite powders. They next painted these ingredients in layers in the proper order onto surfaces to create the batteries.

"Spray painting is already an industrial process, so it would be very easy to incorporate this into industry," Singh said.

Batteries that the researchers printed onto nine ceramic bathroom tiles could readily power 40 red LED lights. One of these battery tiles was topped with a solar power cell that helped charge the batteries, suggesting the researchers could give any surface the capability to both harvest and store energy.

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