Scientists create stretchable lithium-ion battery that can be wirelessly charged
PTI: Washington, Feb 27 2013, 17:25 IST
the rigid circuits - pop up. This approach works for circuits but not for a stretchable battery. There is not enough space between battery components for the "pop-up" technology to work. Huang's design solution is to use metal wire interconnects that are long, wavy lines, filling the small space between battery components.
The unique mechanism is a "spring within a spring": The line connecting the components is a large "S" shape and within that "S" are many smaller "S's".
When the battery is stretched, the large "S" first stretches out and disappears, leaving a line of small squiggles. The stretching continues, with the small squiggles disappearing as the interconnect between electrodes becomes taut.
"We call this ordered unravelling. And this is how we can produce a battery that stretches up to 300 per cent of its original size," Huang said.
The stretching process is reversible, and the battery can work for eight to nine hours before it needs recharging.
The details of the battery were published in journal Nature Communications.
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